HONEYCOMB-9: Migrate Interface listener

Change-Id: Iffde1ee21b749a8c8efa96c243f7f8bb0811b4c7
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>

43 files changed, 1878 insertions, 254 deletions

diff --git a/v3po/api/src/main/yang/v3po.yang b/v3po/api/src/main/yang/v3po.yang
index 43d318643..0ea54fa03 100644
--- a/v3po/api/src/main/yang/v3po.yang
+++ b/v3po/api/src/main/yang/v3po.yang
@@ -85,6 +85,11 @@ module v3po {
 
   augment /if:interfaces/if:interface {
     ext:augment-identifier "vpp-interface-augmentation";
+
+    // FIXME using ietf-interfaces model for vpp interfaces makes it hard to implement because:
+    // 1. The link between interface type and this augmentation is unclear
+    // 2. Only this augmentation with combination of ifc type is trigger to do something for vpp, what if user only configures base interface stuff ? + We need to get leaves defined by ietf-interfaces when we are processing this augment
+
     container ethernet {
       when "../if:type = 'ianaift:ethernetCsmacd'";
       leaf mtu {
diff --git a/v3po/impl/pom.xml b/v3po/impl/pom.xml
index ffa16aed2..63eb1f442 100644
--- a/v3po/impl/pom.xml
+++ b/v3po/impl/pom.xml
@@ -86,12 +86,6 @@
       <version>1.5.6</version>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.skinny-framework</groupId>
-      <artifactId>skinny-logback</artifactId>
-      <version>1.0.8</version>
-      <scope>test</scope>
-    </dependency>
   </dependencies>
 
 
diff --git a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/ChildWriter.java b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/ChildWriter.java
index f933cfd4a..b38f26983 100644
--- a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/ChildWriter.java
+++ b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/ChildWriter.java
@@ -38,7 +38,7 @@ public interface ChildWriter<D extends DataObject> extends Writer<D> {
      */
     void writeChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                     @Nonnull final DataObject parentDataAfter,
-                    @Nonnull final WriteContext ctx);
+                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 
     /**
      * Extract data object managed by this writer(if necessary) from parent data and perform delete.
@@ -49,7 +49,7 @@ public interface ChildWriter<D extends DataObject> extends Writer<D> {
      */
     void deleteChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                      @Nonnull final DataObject parentDataBefore,
-                     @Nonnull final WriteContext ctx);
+                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 
     /**
      * Extract data object managed by this writer(if necessary) from parent data and perform delete.
@@ -62,5 +62,5 @@ public interface ChildWriter<D extends DataObject> extends Writer<D> {
     void updateChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                      @Nonnull final DataObject parentDataBefore,
                      @Nonnull final DataObject parentDataAfter,
-                     @Nonnull final WriteContext ctx);
+                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 }
diff --git a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriteFailedException.java b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriteFailedException.java
new file mode 100644
index 000000000..a924c7646
--- /dev/null
+++ b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriteFailedException.java
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.write;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import io.fd.honeycomb.v3po.translate.TranslationException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Thrown when a writer or customizer is not able to write/update/delete data .
+ */
+public class WriteFailedException extends TranslationException {
+
+    private final InstanceIdentifier<?> failedId;
+
+    /**
+     * Constructs an WriteFailedException given data id and exception cause.
+     *
+     * @param failedId instance identifier of the data object that could not be read
+     * @param cause    the cause of read failure
+     * @param message
+     */
+    public WriteFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                @Nonnull final String message,
+                                @Nonnull final Throwable cause) {
+        super(message, cause);
+        this.failedId = checkNotNull(failedId, "failedId should not be null");
+    }
+
+    /**
+     * Constructs an WriteFailedException given data id.
+     *
+     * @param failedId instance identifier of the data object that could not be written
+     */
+    public WriteFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                @Nonnull final String message) {
+        super(message);
+        this.failedId = checkNotNull(failedId, "failedId should not be null");
+    }
+
+    /**
+     * Returns id of the data object that could not be written.
+     *
+     * @return data object instance identifier
+     */
+    @Nonnull
+    public InstanceIdentifier<?> getFailedId() {
+        return failedId;
+    }
+
+
+    /**
+     * Delete specific write failed exception
+     */
+    public static class DeleteFailedException extends WriteFailedException {
+
+        public DeleteFailedException(@Nonnull final InstanceIdentifier<?> failedId, @Nonnull final Throwable cause) {
+            super(failedId, getMsg(failedId), cause);
+        }
+
+        private static String getMsg(@Nonnull final InstanceIdentifier<?> failedId) {
+            return String.format("Failed to delete data at: %s", failedId);
+        }
+
+        public DeleteFailedException(@Nonnull final InstanceIdentifier<?> failedId) {
+            super(failedId, getMsg(failedId));
+        }
+    }
+
+    /**
+     * Create specific write failed exception
+     */
+    public static class CreateFailedException extends WriteFailedException {
+
+        private final DataObject data;
+
+        public CreateFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                     @Nonnull final DataObject data,
+                                     @Nonnull final Throwable cause) {
+            super(failedId, getMsg(failedId, data), cause);
+            this.data = checkNotNull(data, "data");
+        }
+
+        private static String getMsg(final @Nonnull InstanceIdentifier<?> failedId, final DataObject data) {
+            return String.format("Failed to create data: %s at: %s", data, failedId);
+        }
+
+        public CreateFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                     @Nonnull final DataObject data) {
+            super(failedId, getMsg(failedId, data));
+            this.data = checkNotNull(data, "data");
+        }
+
+        public DataObject getData() {
+            return data;
+        }
+    }
+
+    /**
+     * Update specific write failed exception
+     */
+    public static class UpdateFailedException extends WriteFailedException {
+
+        private final DataObject dataBefore;
+        private final DataObject dataAfter;
+
+        public UpdateFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                     @Nonnull final DataObject dataBefore,
+                                     @Nonnull final DataObject dataAfter,
+                                     @Nonnull final Throwable cause) {
+            super(failedId, getMsg(failedId, dataBefore, dataAfter), cause);
+            this.dataBefore = checkNotNull(dataBefore, "dataBefore");
+            this.dataAfter = checkNotNull(dataAfter, "dataAfter");
+        }
+
+        private static String getMsg(final @Nonnull InstanceIdentifier<?> failedId, final DataObject dataBefore,
+                                     final DataObject dataAfter) {
+            return String.format("Failed to update data from: %s to: %s, at: %s", dataBefore, dataAfter, failedId);
+        }
+
+        public UpdateFailedException(@Nonnull final InstanceIdentifier<?> failedId,
+                                     @Nonnull final DataObject dataBefore,
+                                     @Nonnull final DataObject dataAfter) {
+            super(failedId, getMsg(failedId, dataBefore, dataAfter));
+            this.dataBefore = checkNotNull(dataBefore, "dataBefore");
+            this.dataAfter = checkNotNull(dataAfter, "dataAfter");
+        }
+
+        public DataObject getDataBefore() {
+            return dataBefore;
+        }
+
+        public DataObject getDataAfter() {
+            return dataAfter;
+        }
+    }
+}
diff --git a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/Writer.java b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/Writer.java
index 08465fdd7..77abe341c 100644
--- a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/Writer.java
+++ b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/Writer.java
@@ -17,7 +17,6 @@
 package io.fd.honeycomb.v3po.translate.write;
 
 import com.google.common.annotations.Beta;
-import io.fd.honeycomb.v3po.translate.TranslationException;
 import io.fd.honeycomb.v3po.translate.SubtreeManager;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -36,14 +35,14 @@ public interface Writer<D extends DataObject> extends SubtreeManager<D> {
     /**
      * Handle update operation. U from CRUD.
      *
-     * @param id         Identifier(from root) of data being written
+     * @param id         Identifier of data being written
      * @param dataBefore Old data
      * @param dataAfter  New, updated data
      * @param ctx        Write context enabling writer to get information about candidate data as well as current data
-     * @throws TranslationException if update failed
+     * @throws WriteFailedException if update failed
      */
     void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
                 @Nullable final DataObject dataBefore,
                 @Nullable final DataObject dataAfter,
-                @Nonnull final WriteContext ctx) throws TranslationException;
+                @Nonnull final WriteContext ctx) throws WriteFailedException;
 }
diff --git a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriterRegistry.java b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriterRegistry.java
index c5a8116c8..d30f06d13 100644
--- a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriterRegistry.java
+++ b/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/write/WriterRegistry.java
@@ -47,10 +47,9 @@ public interface WriterRegistry extends Writer<DataObject> {
      * Thrown when bulk update failed.
      */
     @Beta
-    class BulkUpdateException extends TranslationException {
+    class BulkUpdateException extends WriteFailedException {
 
         private final Reverter reverter;
-        private final InstanceIdentifier<?> failedId; // TODO change to VppDataModification
 
         /**
          * Constructs an BulkUpdateException.
@@ -60,8 +59,7 @@ public interface WriterRegistry extends Writer<DataObject> {
          */
         public BulkUpdateException(@Nonnull final InstanceIdentifier<?> failedId, @Nonnull final Reverter reverter,
                                    final Throwable cause) {
-            super("Bulk update failed at " + failedId, cause);
-            this.failedId = checkNotNull(failedId, "failedId should not be null");
+            super(failedId, "Bulk update failed at " + failedId, cause);
             this.reverter = checkNotNull(reverter, "reverter should not be null");
         }
 
@@ -74,19 +72,10 @@ public interface WriterRegistry extends Writer<DataObject> {
             reverter.revert();
         }
 
-        /**
-         * Returns instance identifier of the data object that caused bulk update to fail.
-         *
-         * @return data object's instance identifier
-         */
-        @Nonnull
-        public InstanceIdentifier<?> getFailedId() {
-            return failedId;
-        }
     }
 
     /**
-     * Abstraction over revert mechanism in cast of a bulk update failure
+     * Abstraction over revert mechanism in case of a bulk update failure
      */
     @Beta
     interface Reverter {
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/TraversalType.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/TraversalType.java
new file mode 100644
index 000000000..3fa0f8d24
--- /dev/null
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/TraversalType.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.impl;
+
+/**
+ * Type of traversal to be used by readers/writers in a tree
+ */
+public enum TraversalType {
+
+    /**
+     * Read current attributes before reading from children
+     */
+    PREORDER,
+
+    /**
+     * Read from children before reading current attributes
+     */
+    POSTORDER
+
+    // TODO implement different traversal types as injectable iterators
+    // TODO implement above traversal types in readers
+
+}
\ No newline at end of file
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java
index f9fa0eeaa..e8d79c538 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/AbstractCompositeReader.java
@@ -22,6 +22,7 @@ import com.google.common.annotations.Beta;
 import com.google.common.base.Optional;
 import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.util.ReflectionUtils;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.read.ChildReader;
@@ -52,10 +53,13 @@ abstract class AbstractCompositeReader<D extends DataObject, B extends Builder<D
     private final Map<Class<? extends DataObject>, ChildReader<? extends ChildOf<D>>> childReaders;
     private final Map<Class<? extends DataObject>, ChildReader<? extends Augmentation<D>>> augReaders;
     private final InstanceIdentifier<D> instanceIdentifier;
+    private final TraversalType traversalType;
 
     AbstractCompositeReader(final Class<D> managedDataObjectType,
                             final List<ChildReader<? extends ChildOf<D>>> childReaders,
-                            final List<ChildReader<? extends Augmentation<D>>> augReaders) {
+                            final List<ChildReader<? extends Augmentation<D>>> augReaders,
+                            final TraversalType traversalType) {
+        this.traversalType = traversalType;
         this.childReaders = RWUtils.uniqueLinkedIndex(childReaders, RWUtils.MANAGER_CLASS_FUNCTION);
         this.augReaders = RWUtils.uniqueLinkedIndex(augReaders, RWUtils.MANAGER_CLASS_AUG_FUNCTION);
         this.instanceIdentifier = InstanceIdentifier.create(managedDataObjectType);
@@ -78,9 +82,31 @@ abstract class AbstractCompositeReader<D extends DataObject, B extends Builder<D
         // Cache empty value to determine if anything has changed later TODO cache in a field
         final D emptyValue = builder.build();
 
-        LOG.trace("{}: Reading current attributes", this);
-        readCurrentAttributes(id, builder, ctx);
+        switch (traversalType) {
+            case PREORDER: {
+                LOG.trace("{}: Reading current attributes", this);
+                readCurrentAttributes(id, builder, ctx);
+                readChildren(id, ctx, builder);
+            }
+            case POSTORDER: {
+                readChildren(id, ctx, builder);
+                LOG.trace("{}: Reading current attributes", this);
+                readCurrentAttributes(id, builder, ctx);
+            }
+        }
+
+        // Need to check whether anything was filled in to determine if data is present or not.
+        final D built = builder.build();
+        final Optional<D> read = built.equals(emptyValue)
+            ? Optional.<D>absent()
+            : Optional.of(built);
+
+        LOG.debug("{}: Current node read successfully. Result: {}", this, read);
+        return read;
+    }
 
+    private void readChildren(final InstanceIdentifier<D> id, final @Nonnull ReadContext ctx, final B builder)
+        throws ReadFailedException {
         // TODO expect exceptions from reader
         for (ChildReader<? extends ChildOf<D>> child : childReaders.values()) {
             LOG.debug("{}: Reading child from: {}", this, child);
@@ -91,15 +117,6 @@ abstract class AbstractCompositeReader<D extends DataObject, B extends Builder<D
             LOG.debug("{}: Reading augment from: {}", this, child);
             child.read(id, builder, ctx);
         }
-
-        // Need to check whether anything was filled in to determine if data is present or not.
-        final D built = builder.build();
-        final Optional<D> read = built.equals(emptyValue)
-            ? Optional.<D>absent()
-            : Optional.of(built);
-
-        LOG.debug("{}: Current node read successfully. Result: {}", this, read);
-        return read;
     }
 
     @Nonnull
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java
index 46a59bb90..1984cd86d 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeChildReader.java
@@ -18,6 +18,7 @@ package io.fd.honeycomb.v3po.translate.impl.read;
 
 import com.google.common.annotations.Beta;
 import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.read.ReadContext;
 import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
@@ -56,7 +57,25 @@ public final class CompositeChildReader<C extends DataObject, B extends Builder<
                                 @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
                                 @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
                                 @Nonnull final ChildReaderCustomizer<C, B> customizer) {
-        super(managedDataObjectType, childReaders, augReaders);
+        this(managedDataObjectType, childReaders, augReaders, customizer, TraversalType.PREORDER);
+    }
+
+    /**
+     * Create new {@link CompositeChildReader}
+     *
+     * @param managedDataObjectType Class object for managed data type
+     * @param childReaders Child nodes(container, list) readers
+     * @param augReaders Child augmentations readers
+     * @param customizer Customizer instance to customize this generic reader
+     * @param traversalType Type of traversal to use in the tree of readers
+     *
+     */
+    public CompositeChildReader(@Nonnull final Class<C> managedDataObjectType,
+                                @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                                @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                                @Nonnull final ChildReaderCustomizer<C, B> customizer,
+                                @Nonnull final TraversalType traversalType) {
+        super(managedDataObjectType, childReaders, augReaders, traversalType);
         this.customizer = customizer;
     }
 
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java
index fd7b279ca..de32ee723 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeListReader.java
@@ -20,6 +20,7 @@ import static com.google.common.base.Preconditions.checkArgument;
 
 import com.google.common.annotations.Beta;
 import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.read.ChildReader;
@@ -68,7 +69,24 @@ public final class CompositeListReader<C extends DataObject & Identifiable<K>, K
                                @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
                                @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
                                @Nonnull final ListReaderCustomizer<C, K, B> customizer) {
-        super(managedDataObjectType, childReaders, augReaders);
+        this(managedDataObjectType, childReaders, augReaders, customizer, TraversalType.PREORDER);
+    }
+
+    /**
+     * Create new {@link CompositeListReader}
+     *
+     * @param managedDataObjectType Class object for managed data type. Must come from a list node type.
+     * @param childReaders          Child nodes(container, list) readers
+     * @param augReaders            Child augmentations readers
+     * @param customizer            Customizer instance to customize this generic reader
+     * @param traversalType Type of traversal to use in the tree of readers
+     */
+    public CompositeListReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                               @Nonnull final ListReaderCustomizer<C, K, B> customizer,
+                               @Nonnull final TraversalType traversalType) {
+        super(managedDataObjectType, childReaders, augReaders, traversalType);
         this.customizer = customizer;
     }
 
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java
index f297abb76..0abae70be 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/read/CompositeRootReader.java
@@ -17,6 +17,7 @@
 package io.fd.honeycomb.v3po.translate.impl.read;
 
 import com.google.common.annotations.Beta;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.read.ChildReader;
@@ -55,7 +56,25 @@ public final class CompositeRootReader<C extends DataObject, B extends Builder<C
                                @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
                                @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
                                @Nonnull final RootReaderCustomizer<C, B> customizer) {
-        super(managedDataObjectType, childReaders, augReaders);
+        this(managedDataObjectType, childReaders, augReaders, customizer, TraversalType.PREORDER);
+    }
+
+    /**
+     * Create new {@link CompositeRootReader}
+     *
+     * @param managedDataObjectType Class object for managed data type
+     * @param childReaders Child nodes(container, list) readers
+     * @param augReaders Child augmentations readers
+     * @param customizer Customizer instance to customize this generic reader
+     * @param traversalType Type of traversal to use in the tree of readers
+     *
+     */
+    public CompositeRootReader(@Nonnull final Class<C> managedDataObjectType,
+                               @Nonnull final List<ChildReader<? extends ChildOf<C>>> childReaders,
+                               @Nonnull final List<ChildReader<? extends Augmentation<C>>> augReaders,
+                               @Nonnull final RootReaderCustomizer<C, B> customizer,
+                               @Nonnull final TraversalType traversalType) {
+        super(managedDataObjectType, childReaders, augReaders, traversalType);
         this.customizer = customizer;
     }
 
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java
index e971fbeff..1e4d1361a 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/AbstractCompositeWriter.java
@@ -20,10 +20,11 @@ import static com.google.common.base.Preconditions.checkArgument;
 
 import com.google.common.base.Optional;
 import com.google.common.collect.Lists;
-import io.fd.honeycomb.v3po.translate.TranslationException;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
-import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import io.fd.honeycomb.v3po.translate.write.Writer;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -46,21 +47,42 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
     private final Map<Class<? extends DataObject>, ChildWriter<? extends ChildOf<D>>> childWriters;
     private final Map<Class<? extends DataObject>, ChildWriter<? extends Augmentation<D>>> augWriters;
     private final InstanceIdentifier<D> instanceIdentifier;
+    private TraversalType traversalType;
 
     public AbstractCompositeWriter(final Class<D> type,
                                    final List<ChildWriter<? extends ChildOf<D>>> childWriters,
-                                   final List<ChildWriter<? extends Augmentation<D>>> augWriters) {
+                                   final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                                   final TraversalType traversalType) {
+        this.traversalType = traversalType;
         this.instanceIdentifier = InstanceIdentifier.create(type);
         this.childWriters = RWUtils.uniqueLinkedIndex(childWriters, RWUtils.MANAGER_CLASS_FUNCTION);
         this.augWriters = RWUtils.uniqueLinkedIndex(augWriters, RWUtils.MANAGER_CLASS_AUG_FUNCTION);
     }
 
-    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx) {
+    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
+        throws WriteFailedException {
         LOG.debug("{}: Writing current: {} data: {}", this, id, data);
 
-        LOG.trace("{}: Writing current attributes", this);
-        writeCurrentAttributes(id, data, ctx);
+        switch (traversalType) {
+            case PREORDER: {
+                LOG.trace("{}: Writing current attributes", this);
+                writeCurrentAttributes(id, data, ctx);
+                writeChildren(id, data, ctx);
+                break;
+            }
+            case POSTORDER: {
+                writeChildren(id, data, ctx);
+                LOG.trace("{}: Writing current attributes", this);
+                writeCurrentAttributes(id, data, ctx);
+                break;
+            }
+        }
 
+        LOG.debug("{}: Current node written successfully", this);
+    }
+
+    private void writeChildren(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
+        throws WriteFailedException {
         for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
             LOG.debug("{}: Writing child in: {}", this, child);
             child.writeChild(id, data, ctx);
@@ -70,23 +92,38 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
             LOG.debug("{}: Writing augment in: {}", this, child);
             child.writeChild(id, data, ctx);
         }
-
-        LOG.debug("{}: Current node written successfully", this);
     }
 
     protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
-                                 final WriteContext ctx) {
+                                 final WriteContext ctx) throws WriteFailedException {
         LOG.debug("{}: Updating current: {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
 
-        if(dataBefore.equals(dataAfter)) {
+        if (dataBefore.equals(dataAfter)) {
             LOG.debug("{}: Skipping current(no update): {}", this, id);
             // No change, ignore
             return;
         }
 
-        LOG.trace("{}: Updating current attributes", this);
-        updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
+        switch (traversalType) {
+            case PREORDER: {
+                LOG.trace("{}: Updating current attributes", this);
+                updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
+                updateChildren(id, dataBefore, dataAfter, ctx);
+                break;
+            }
+            case POSTORDER: {
+                updateChildren(id, dataBefore, dataAfter, ctx);
+                LOG.trace("{}: Updating current attributes", this);
+                updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
+                break;
+            }
+        }
+
+        LOG.debug("{}: Current node updated successfully", this);
+    }
 
+    private void updateChildren(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
+                                final WriteContext ctx) throws WriteFailedException {
         for (ChildWriter<? extends ChildOf<D>> child : childWriters.values()) {
             LOG.debug("{}: Updating child in: {}", this, child);
             child.updateChild(id, dataBefore, dataAfter, ctx);
@@ -96,14 +133,30 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
             LOG.debug("{}: Updating augment in: {}", this, child);
             child.updateChild(id, dataBefore, dataAfter, ctx);
         }
-
-        LOG.debug("{}: Current node updated successfully", this);
     }
 
-    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx) {
+    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
+        throws WriteFailedException {
         LOG.debug("{}: Deleting current: {} dataBefore: {}", this, id, dataBefore);
 
-        // delete in reversed order
+        switch (traversalType) {
+            case PREORDER: {
+                deleteChildren(id, dataBefore, ctx);
+                LOG.trace("{}: Deleting current attributes", this);
+                deleteCurrentAttributes(id, dataBefore, ctx);
+                break;
+            }
+            case POSTORDER: {
+                LOG.trace("{}: Deleting current attributes", this);
+                deleteCurrentAttributes(id, dataBefore, ctx);
+                deleteChildren(id, dataBefore, ctx);
+                break;
+            }
+        }
+    }
+
+    private void deleteChildren(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
+        throws WriteFailedException {
         for (ChildWriter<? extends Augmentation<D>> child : reverseCollection(augWriters.values())) {
             LOG.debug("{}: Deleting augment in: {}", this, child);
             child.deleteChild(id, dataBefore, ctx);
@@ -113,9 +166,6 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
             LOG.debug("{}: Deleting child in: {}", this, child);
             child.deleteChild(id, dataBefore, ctx);
         }
-
-        LOG.trace("{}: Deleting current attributes", this);
-        deleteCurrentAttributes(id, dataBefore, ctx);
     }
 
     @SuppressWarnings("unchecked")
@@ -123,7 +173,7 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
     public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
                        @Nullable final DataObject dataBefore,
                        @Nullable final DataObject dataAfter,
-                       @Nonnull final WriteContext ctx) throws TranslationException {
+                       @Nonnull final WriteContext ctx) throws WriteFailedException {
         LOG.debug("{}: Updating : {}", this, id);
         LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
 
@@ -168,7 +218,7 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
     }
 
     private void writeSubtree(final InstanceIdentifier<? extends DataObject> id,
-                              final DataObject dataAfter, final WriteContext ctx) throws TranslationException {
+                              final DataObject dataAfter, final WriteContext ctx) throws WriteFailedException {
         LOG.debug("{}: Writing subtree: {}", this, id);
         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 
@@ -190,9 +240,8 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
         return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
     }
 
-    @SuppressWarnings("unchecked")
     private void deleteSubtree(final InstanceIdentifier<? extends DataObject> id,
-                               final DataObject dataBefore, final WriteContext ctx) throws TranslationException {
+                               final DataObject dataBefore, final WriteContext ctx) throws WriteFailedException {
         LOG.debug("{}: Deleting subtree: {}", this, id);
         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 
@@ -205,7 +254,8 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
     }
 
     @SuppressWarnings("unchecked")
-    private void updateSubtreeFromCurrent(final InstanceIdentifier<? extends DataObject> id, final WriteContext ctx) {
+    private void updateSubtreeFromCurrent(final InstanceIdentifier<? extends DataObject> id, final WriteContext ctx)
+        throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.cutId(id, getManagedDataObjectType());
         Optional<DataObject> currentDataBefore = ctx.readBefore(currentId);
         Optional<DataObject> currentDataAfter = ctx.readAfter(currentId);
@@ -215,11 +265,10 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
             castToManaged(currentDataAfter.orNull()), ctx);
     }
 
-    @SuppressWarnings("unchecked")
     private void updateSubtree(final InstanceIdentifier<? extends DataObject> id,
                                final DataObject dataBefore,
                                final DataObject dataAfter,
-                               final WriteContext ctx) throws TranslationException {
+                               final WriteContext ctx) throws WriteFailedException {
         LOG.debug("{}: Updating subtree: {}", this, id);
         final Writer<? extends ChildOf<D>> writer = getNextWriter(id);
 
@@ -245,16 +294,16 @@ public abstract class AbstractCompositeWriter<D extends DataObject> implements W
 
     protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                                    @Nonnull final D data,
-                                                   @Nonnull final WriteContext ctx);
+                                                   @Nonnull final WriteContext ctx) throws WriteFailedException;
 
     protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                                     @Nonnull final D dataBefore,
-                                                    @Nonnull final WriteContext ctx);
+                                                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 
     protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                                     @Nonnull final D dataBefore,
                                                     @Nonnull final D dataAfter,
-                                                    @Nonnull final WriteContext ctx);
+                                                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 
     @Nonnull
     @Override
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java
index fbfeffbdb..512eb44d9 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeChildWriter.java
@@ -17,10 +17,12 @@
 package io.fd.honeycomb.v3po.translate.impl.write;
 
 import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import java.util.List;
 import javax.annotation.Nonnull;
 import org.opendaylight.yangtools.yang.binding.Augmentation;
@@ -37,7 +39,16 @@ public class CompositeChildWriter<D extends DataObject> extends AbstractComposit
                                 @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
                                 @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
                                 @Nonnull final ChildWriterCustomizer<D> customizer) {
-        super(type, childWriters, augWriters);
+        this(type, childWriters, augWriters, customizer, TraversalType.PREORDER);
+    }
+
+
+    public CompositeChildWriter(@Nonnull final Class<D> type,
+                                @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                                @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                                @Nonnull final ChildWriterCustomizer<D> customizer,
+                                @Nonnull final TraversalType traversalType) {
+        super(type, childWriters, augWriters, traversalType);
         this.customizer = customizer;
     }
 
@@ -54,25 +65,27 @@ public class CompositeChildWriter<D extends DataObject> extends AbstractComposit
 
     @Override
     protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
-                                          @Nonnull final WriteContext ctx) {
+                                          @Nonnull final WriteContext ctx) throws WriteFailedException {
         customizer.writeCurrentAttributes(id, data, ctx.getContext());
     }
 
     @Override
     protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
-                                           @Nonnull WriteContext ctx) {
+                                           @Nonnull WriteContext ctx) throws WriteFailedException {
         customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
     }
 
     @Override
     protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
-                                           @Nonnull final D dataAfter, @Nonnull WriteContext ctx) {
+                                           @Nonnull final D dataAfter, @Nonnull WriteContext ctx)
+        throws WriteFailedException {
         customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
     }
 
     @Override
     public void writeChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
-                           @Nonnull final DataObject parentData, @Nonnull WriteContext ctx) {
+                           @Nonnull final DataObject parentData, @Nonnull WriteContext ctx)
+        throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final Optional<D> currentData = customizer.extract(currentId, parentData);
         if(currentData.isPresent()) {
@@ -83,7 +96,7 @@ public class CompositeChildWriter<D extends DataObject> extends AbstractComposit
     @Override
     public void deleteChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                             @Nonnull final DataObject parentData,
-                            @Nonnull final WriteContext ctx) {
+                            @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final Optional<D> currentData = customizer.extract(currentId, parentData);
         if(currentData.isPresent()) {
@@ -94,7 +107,7 @@ public class CompositeChildWriter<D extends DataObject> extends AbstractComposit
     @Override
     public void updateChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                             @Nonnull final DataObject parentDataBefore, @Nonnull final DataObject parentDataAfter,
-                            @Nonnull final WriteContext ctx) {
+                            @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final Optional<D> before = customizer.extract(currentId, parentDataBefore);
         final Optional<D> after = customizer.extract(currentId, parentDataAfter);
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java
index dc924fe39..967edb6a9 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeListWriter.java
@@ -20,10 +20,12 @@ import com.google.common.base.Function;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.spi.write.ListWriterCustomizer;
 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import java.util.List;
 import java.util.Map;
 import javax.annotation.Nonnull;
@@ -54,7 +56,15 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
                                @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
                                @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
                                @Nonnull final ListWriterCustomizer<D, K> customizer) {
-        super(type, childWriters, augWriters);
+        this(type, childWriters, augWriters, customizer, TraversalType.PREORDER);
+    }
+
+    public CompositeListWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                               @Nonnull final ListWriterCustomizer<D, K> customizer,
+                               @Nonnull final TraversalType traversalType) {
+        super(type, childWriters, augWriters, traversalType);
         this.customizer = customizer;
     }
 
@@ -72,26 +82,27 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
 
     @Override
     protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
-                                          @Nonnull final WriteContext ctx) {
+                                          @Nonnull final WriteContext ctx) throws WriteFailedException {
         customizer.writeCurrentAttributes(id, data, ctx.getContext());
     }
 
     @Override
     protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
-                                           @Nonnull final WriteContext ctx) {
+                                           @Nonnull final WriteContext ctx) throws WriteFailedException {
         customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
     }
 
     @Override
     protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
-                                           @Nonnull final D dataAfter, @Nonnull final WriteContext ctx) {
+                                           @Nonnull final D dataAfter, @Nonnull final WriteContext ctx)
+        throws WriteFailedException {
         customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
     }
 
     @Override
     public void writeChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                            @Nonnull final DataObject parentData,
-                           @Nonnull final WriteContext ctx) {
+                           @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final List<D> currentData = customizer.extract(currentId, parentData);
         for (D entry : currentData) {
@@ -102,7 +113,7 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
     @Override
     public void deleteChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                             @Nonnull final DataObject parentDataBefore,
-                            @Nonnull final WriteContext ctx) {
+                            @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final List<D> dataBefore = customizer.extract(currentId, parentDataBefore);
         for (D entry : dataBefore) {
@@ -113,7 +124,7 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
     @Override
     public void updateChild(@Nonnull final InstanceIdentifier<? extends DataObject> parentId,
                             @Nonnull final DataObject parentDataBefore, @Nonnull final DataObject parentDataAfter,
-                            @Nonnull final WriteContext ctx) {
+                            @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier<D> currentId = RWUtils.appendTypeToId(parentId, getManagedDataObjectType());
         final ImmutableMap<Object, D>
             dataBefore = Maps.uniqueIndex(customizer.extract(currentId, parentDataBefore), INDEX_FUNCTION);
@@ -138,7 +149,8 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
     }
 
     @Override
-    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx) {
+    protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
+        throws WriteFailedException {
         // Make sure the key is present
         if(isWildcarded(id)) {
             super.writeCurrent(getSpecificId(id, data), data, ctx);
@@ -149,7 +161,7 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
 
     @Override
     protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
-                                 final WriteContext ctx) {
+                                 final WriteContext ctx) throws WriteFailedException {
         // Make sure the key is present
         if(isWildcarded(id)) {
             super.updateCurrent(getSpecificId(id, dataBefore), dataBefore, dataAfter, ctx);
@@ -159,7 +171,8 @@ public class CompositeListWriter<D extends DataObject & Identifiable<K>, K exten
     }
 
     @Override
-    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx) {
+    protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
+        throws WriteFailedException {
         // Make sure the key is present
         if(isWildcarded(id)) {
             super.deleteCurrent(getSpecificId(id, dataBefore), dataBefore, ctx);
diff --git a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java
index acf2cfd2e..5e4ff86ad 100644
--- a/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java
+++ b/v3po/translate-impl/src/main/java/io/fd/honeycomb/v3po/translate/impl/write/CompositeRootWriter.java
@@ -16,10 +16,12 @@
 
 package io.fd.honeycomb.v3po.translate.impl.write;
 
-import io.fd.honeycomb.v3po.translate.write.WriteContext;
-import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
 import io.fd.honeycomb.v3po.translate.spi.write.RootWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import java.util.List;
 import javax.annotation.Nonnull;
 import org.opendaylight.yangtools.yang.binding.Augmentation;
@@ -35,7 +37,15 @@ public class CompositeRootWriter<D extends DataObject> extends AbstractComposite
                                @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
                                @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
                                @Nonnull final RootWriterCustomizer<D> customizer) {
-        super(type, childWriters, augWriters);
+        this(type, childWriters, augWriters, customizer, TraversalType.PREORDER);
+    }
+
+    public CompositeRootWriter(@Nonnull final Class<D> type,
+                               @Nonnull final List<ChildWriter<? extends ChildOf<D>>> childWriters,
+                               @Nonnull final List<ChildWriter<? extends Augmentation<D>>> augWriters,
+                               @Nonnull final RootWriterCustomizer<D> customizer,
+                               @Nonnull final TraversalType traversalType) {
+        super(type, childWriters, augWriters, traversalType);
         this.customizer = customizer;
     }
 
@@ -52,13 +62,15 @@ public class CompositeRootWriter<D extends DataObject> extends AbstractComposite
 
     @Override
     protected void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D data,
-                                          @Nonnull final WriteContext ctx) {
+                                          @Nonnull final WriteContext ctx) throws WriteFailedException {
+        // TODO wrap all customizer invocations in try catch, and wrap runtime exceptions in ReadFailed
+        // TODO same for readers
         customizer.writeCurrentAttributes(id, data, ctx.getContext());
     }
 
     @Override
     protected void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id, @Nonnull final D dataBefore,
-                                           @Nonnull final WriteContext ctx) {
+                                           @Nonnull final WriteContext ctx) throws WriteFailedException {
         customizer.deleteCurrentAttributes(id, dataBefore, ctx.getContext());
     }
 
@@ -66,7 +78,7 @@ public class CompositeRootWriter<D extends DataObject> extends AbstractComposite
     protected void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                            @Nonnull final D dataBefore,
                                            @Nonnull final D dataAfter,
-                                           @Nonnull final WriteContext ctx) {
+                                           @Nonnull final WriteContext ctx) throws WriteFailedException {
         customizer.updateCurrentAttributes(id, dataBefore, dataAfter, ctx.getContext());
     }
 }
diff --git a/v3po/translate-spi/src/main/java/io/fd/honeycomb/v3po/translate/spi/write/RootWriterCustomizer.java b/v3po/translate-spi/src/main/java/io/fd/honeycomb/v3po/translate/spi/write/RootWriterCustomizer.java
index ca4f02dce..2cdcff3fd 100644
--- a/v3po/translate-spi/src/main/java/io/fd/honeycomb/v3po/translate/spi/write/RootWriterCustomizer.java
+++ b/v3po/translate-spi/src/main/java/io/fd/honeycomb/v3po/translate/spi/write/RootWriterCustomizer.java
@@ -18,6 +18,7 @@ package io.fd.honeycomb.v3po.translate.spi.write;
 
 import com.google.common.annotations.Beta;
 import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import javax.annotation.Nonnull;
 import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
@@ -36,10 +37,12 @@ public interface RootWriterCustomizer<D extends DataObject> {
      * @param id Identifier(from root) of data being written
      * @param dataAfter New data to be written
      * @param writeContext Write context can be used to store any useful information and then utilized by other customizers
+     *
+     * @throws WriteFailedException if write was unsuccessful
      */
     void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                 @Nonnull final D dataAfter,
-                                @Nonnull final Context writeContext);
+                                @Nonnull final Context writeContext) throws WriteFailedException;
 
     /**
      * Handle update operation. U from CRUD.
@@ -48,11 +51,13 @@ public interface RootWriterCustomizer<D extends DataObject> {
      * @param dataBefore Old data
      * @param dataAfter New, updated data
      * @param writeContext Write context can be used to store any useful information and then utilized by other customizers
+     *
+     * @throws WriteFailedException if update was unsuccessful
      */
     void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                  @Nonnull final D dataBefore,
                                  @Nonnull final D dataAfter,
-                                 @Nonnull final Context writeContext);
+                                 @Nonnull final Context writeContext) throws WriteFailedException;
 
     /**
      * Handle delete operation. D from CRUD.
@@ -60,8 +65,10 @@ public interface RootWriterCustomizer<D extends DataObject> {
      * @param id Identifier(from root) of data being written
      * @param dataBefore Old data being deleted
      * @param writeContext Write context can be used to store any useful information and then utilized by other customizers
+     *
+     * @throws WriteFailedException if delete was unsuccessful
      */
     void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
                                  @Nonnull final D dataBefore,
-                                 @Nonnull final Context writeContext);
+                                 @Nonnull final Context writeContext) throws WriteFailedException;
 }
diff --git a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/RWUtils.java b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/RWUtils.java
index 027d9bbb7..dbfed04b0 100644
--- a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/RWUtils.java
+++ b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/RWUtils.java
@@ -89,6 +89,11 @@ public final class RWUtils {
         return Collections.<ChildWriter<? extends ChildOf<T>>>singletonList(item);
     }
 
+    public static <T> List<ChildWriter<? extends Augmentation<T>>> singletonAugWriterList(
+        ChildWriter<? extends Augmentation<T>> item) {
+        return Collections.<ChildWriter<? extends Augmentation<T>>>singletonList(item);
+    }
+
     /**
      * Replace last item in ID with a provided IdentifiableItem of the same type
      */
diff --git a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/CloseableReader.java b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/CloseableReader.java
new file mode 100644
index 000000000..5492062e3
--- /dev/null
+++ b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/CloseableReader.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.util.read;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.read.ReadContext;
+import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
+import io.fd.honeycomb.v3po.translate.read.Reader;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Closeable wrapper for a reader
+ */
+public final class CloseableReader<D extends DataObject> implements Reader<D>, AutoCloseable {
+
+    private Reader<D> compositeRootReader;
+
+    public CloseableReader(@Nonnull final Reader<D> compositeRootReader) {
+        this.compositeRootReader = compositeRootReader;
+    }
+
+    @Nonnull
+    @Override
+    public Optional<? extends DataObject> read(@Nonnull InstanceIdentifier<? extends DataObject> id,
+                                               @Nonnull ReadContext ctx) throws ReadFailedException {
+        return compositeRootReader.read(id, ctx);
+    }
+
+    @Nonnull
+    @Override
+    public InstanceIdentifier<D> getManagedDataObjectType() {
+        return compositeRootReader.getManagedDataObjectType();
+    }
+
+    @Override
+    public String toString() {
+        return compositeRootReader.toString();
+    }
+
+    @Override
+    public void close() throws Exception {
+        //NOOP
+    }
+}
diff --git a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/CloseableWriter.java b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/CloseableWriter.java
new file mode 100644
index 000000000..3442f8370
--- /dev/null
+++ b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/CloseableWriter.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.util.write;
+
+import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import io.fd.honeycomb.v3po.translate.write.Writer;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Closeable wrapper for a writer
+ */
+public final class CloseableWriter<D extends DataObject> implements Writer<D>, AutoCloseable {
+
+    private Writer<D> vppCompositeRootWriter;
+
+    public CloseableWriter(
+        final Writer<D> vppCompositeRootWriter) {
+        this.vppCompositeRootWriter = vppCompositeRootWriter;
+    }
+
+    @Override
+    public void update(
+        @Nonnull final InstanceIdentifier<? extends DataObject> id,
+        @Nullable final DataObject dataBefore,
+        @Nullable final DataObject dataAfter,
+        @Nonnull final WriteContext ctx) throws WriteFailedException {
+        vppCompositeRootWriter.update(id, dataBefore, dataAfter, ctx);
+    }
+
+    @Nonnull
+    @Override
+    public InstanceIdentifier<D> getManagedDataObjectType() {
+        return vppCompositeRootWriter.getManagedDataObjectType();
+    }
+
+    @Override
+    public String toString() {
+        return vppCompositeRootWriter.toString();
+    }
+
+    @Override
+    public void close() throws Exception {
+
+    }
+}
diff --git a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/DelegatingWriterRegistry.java b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/DelegatingWriterRegistry.java
index fda289e2b..f25ba5336 100644
--- a/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/DelegatingWriterRegistry.java
+++ b/v3po/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/write/DelegatingWriterRegistry.java
@@ -24,9 +24,9 @@ import com.google.common.collect.Collections2;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
-import io.fd.honeycomb.v3po.translate.TranslationException;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import io.fd.honeycomb.v3po.translate.write.Writer;
 import io.fd.honeycomb.v3po.translate.write.WriterRegistry;
 import java.util.LinkedList;
@@ -40,8 +40,8 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Simple writer registry able to perform and aggregated read (ROOT write) on top of all provided writers. Also able to
- * delegate a specific read to one of the delegate writers.
+ * Simple writer registry able to perform and aggregated write (ROOT write) on top of all provided writers. Also able to
+ * delegate a specific write to one of the delegate writers.
  *
  * This could serve as a utility to hold & hide all available writers in upper layers.
  */
@@ -82,7 +82,7 @@ public final class DelegatingWriterRegistry implements WriterRegistry {
     public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
                        @Nullable final DataObject dataBefore,
                        @Nullable final DataObject dataAfter,
-                       @Nonnull final WriteContext ctx) throws TranslationException {
+                       @Nonnull final WriteContext ctx) throws WriteFailedException {
         final InstanceIdentifier.PathArgument first = checkNotNull(
                 Iterables.getFirst(id.getPathArguments(), null), "Empty id");
         final Writer<? extends DataObject> writer = rootWriters.get(first.getType());
@@ -94,7 +94,7 @@ public final class DelegatingWriterRegistry implements WriterRegistry {
     @Override
     public void update(@Nonnull final Map<InstanceIdentifier<?>, DataObject> nodesBefore,
                        @Nonnull final Map<InstanceIdentifier<?>, DataObject> nodesAfter,
-                       @Nonnull final WriteContext ctx) throws TranslationException {
+                       @Nonnull final WriteContext ctx) throws WriteFailedException {
         checkAllWritersPresent(nodesBefore);
         checkAllWritersPresent(nodesAfter);
 
diff --git a/v3po/translate-utils/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/translate/utils/rev160406/DelegatingWriterRegistryModule.java b/v3po/translate-utils/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/translate/utils/rev160406/DelegatingWriterRegistryModule.java
index a629a294f..72ec87691 100644
--- a/v3po/translate-utils/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/translate/utils/rev160406/DelegatingWriterRegistryModule.java
+++ b/v3po/translate-utils/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/translate/utils/rev160406/DelegatingWriterRegistryModule.java
@@ -5,6 +5,7 @@ import com.google.common.collect.Lists;
 import io.fd.honeycomb.v3po.translate.TranslationException;
 import io.fd.honeycomb.v3po.translate.util.write.DelegatingWriterRegistry;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import io.fd.honeycomb.v3po.translate.write.Writer;
 import io.fd.honeycomb.v3po.translate.write.WriterRegistry;
 import java.util.List;
@@ -63,7 +64,7 @@ public class DelegatingWriterRegistryModule extends org.opendaylight.yang.gen.v1
         public void update(
             @Nonnull final InstanceIdentifier<? extends DataObject> id,
             @Nullable final DataObject dataBefore, @Nullable final DataObject dataAfter,
-            @Nonnull final WriteContext ctx) throws TranslationException {
+            @Nonnull final WriteContext ctx) throws WriteFailedException {
             delegatingWriterRegistry.update(id, dataBefore, dataAfter, ctx);
         }
 
diff --git a/v3po/translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/impl/write/util/DelegatingWriterRegistryTest.java b/v3po/translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/impl/write/util/DelegatingWriterRegistryTest.java
index e201890b5..f51e49db5 100644
--- a/v3po/translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/impl/write/util/DelegatingWriterRegistryTest.java
+++ b/v3po/translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/impl/write/util/DelegatingWriterRegistryTest.java
@@ -24,9 +24,9 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 
-import io.fd.honeycomb.v3po.translate.TranslationException;
 import io.fd.honeycomb.v3po.translate.util.write.DelegatingWriterRegistry;
 import io.fd.honeycomb.v3po.translate.write.WriteContext;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
 import io.fd.honeycomb.v3po.translate.write.Writer;
 import io.fd.honeycomb.v3po.translate.write.WriterRegistry;
 import java.util.ArrayList;
@@ -117,8 +117,8 @@ public class DelegatingWriterRegistryTest {
         final DataObject dataAfter2 = mockDataObject("VppState after", VppState.class);
 
         // Fail on update
-        Mockito.doThrow(new TranslationException("vpp failed")).when(vppStateWriter)
-                .update(vppStateId, dataBefore2, dataAfter2, ctx);
+        Mockito.doThrow(new WriteFailedException(InstanceIdentifier.create(Vpp.class), "vpp failed"))
+            .when(vppStateWriter).update(vppStateId, dataBefore2, dataAfter2, ctx);
 
         // Run the test
         try {
@@ -154,11 +154,11 @@ public class DelegatingWriterRegistryTest {
         final DataObject dataAfter3 = mockDataObject("Interfaces after", Interfaces.class);
 
         // Fail on the third update
-        doThrow(new TranslationException("vpp failed")).when(interfacesWriter)
+        doThrow(new WriteFailedException(InstanceIdentifier.create(Vpp.class), "vpp failed")).when(interfacesWriter)
                 .update(interfaceId, dataBefore3, dataAfter3, ctx);
 
         // Fail on the second revert
-        doThrow(new TranslationException("vpp failed again")).when(writer)
+        doThrow(new WriteFailedException(InstanceIdentifier.create(Vpp.class), "vpp failed")).when(writer)
                 .update(vppId, dataAfter1, dataBefore1, ctx);
 
         // Run the test
diff --git a/v3po/v3po2vpp/src/main/config/default-config.xml b/v3po/v3po2vpp/src/main/config/default-config.xml
index 1a1e6a8f5..89c3c47a2 100644
--- a/v3po/v3po2vpp/src/main/config/default-config.xml
+++ b/v3po/v3po2vpp/src/main/config/default-config.xml
@@ -53,6 +53,15 @@
                 </module>
 
                 <module>
+                    <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:v3po2vpp">prefix:interfaces-honeycomb-writer</type>
+                    <name>interfaces-honeycomb-writer</name>
+                    <vpp-japi-ifc>
+                        <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:vpp:japi:cfg">prefix:vpp-japi</type>
+                        <name>vpp-japi</name>
+                    </vpp-japi-ifc>
+                </module>
+
+                <module>
                     <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:translate:utils">prefix:delegating-reader-registry</type>
                     <name>read-registry</name>
                     <root-readers>
@@ -64,6 +73,7 @@
                         <name>interfaces-state-honeycomb-reader</name>
                     </root-readers>
                 </module>
+
                 <module>
                     <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:translate:utils">prefix:delegating-writer-registry</type>
                     <name>write-registry</name>
@@ -71,8 +81,13 @@
                         <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:translate:api">prefix:honeycomb-writer</type>
                         <name>vpp-honeycomb-writer</name>
                     </root-writers>
+                    <root-writers>
+                        <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:translate:api">prefix:honeycomb-writer</type>
+                        <name>interfaces-honeycomb-writer</name>
+                    </root-writers>
                 </module>
             </modules>
+
             <services xmlns="urn:opendaylight:params:xml:ns:yang:controller:config">
                 <service>
                     <type xmlns:prefix="urn:honeycomb:params:xml:ns:yang:translate:api">prefix:honeycomb-reader</type>
@@ -93,6 +108,11 @@
                         <provider>/modules/module[type='vpp-honeycomb-writer'][name='vpp-honeycomb-writer']
                         </provider>
                     </instance>
+                    <instance>
+                        <name>interfaces-honeycomb-writer</name>
+                        <provider>/modules/module[type='interfaces-honeycomb-writer'][name='interfaces-honeycomb-writer']
+                        </provider>
+                    </instance>
                 </service>
             </services>
         </data>
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/EthernetCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/EthernetCustomizer.java
new file mode 100644
index 000000000..69ff63137
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/EthernetCustomizer.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Ethernet;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class EthernetCustomizer extends VppApiCustomizer implements ChildWriterCustomizer<Ethernet> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(EthernetCustomizer.class);
+
+    public EthernetCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Ethernet> extract(@Nonnull final InstanceIdentifier<Ethernet> currentId,
+                                      @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((VppInterfaceAugmentation) parentData).getEthernet());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Ethernet> id,
+                                       @Nonnull final Ethernet dataAfter, @Nonnull final Context writeContext) {
+        // TODO
+        LOG.warn("Unsupported, ignoring configuration {}", dataAfter);
+
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Ethernet> id,
+                                        @Nonnull final Ethernet dataBefore, @Nonnull final Ethernet dataAfter,
+                                        @Nonnull final Context writeContext) {
+        // TODO
+        LOG.warn("Unsupported, ignoring configuration {}", dataAfter);
+
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Ethernet> id,
+                                        @Nonnull final Ethernet dataBefore, @Nonnull final Context writeContext) {
+        // TODO
+        LOG.warn("Unsupported, ignoring configuration delete {}", id);
+
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/InterfaceCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/InterfaceCustomizer.java
new file mode 100644
index 000000000..6b91e2e0a
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/InterfaceCustomizer.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ListWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.Interfaces;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.InterfaceKey;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.openvpp.vppjapi.vppApi;
+
+/**
+ * Ietf interface write customizer that only caches interface objects for child writers
+ */
+public class InterfaceCustomizer extends VppApiCustomizer implements ListWriterCustomizer<Interface, InterfaceKey> {
+
+    public static final String IFC_AFTER_CTX = InterfaceCustomizer.class.toString() + "ifcAfter";
+    public static final String IFC_BEFORE_CTX = InterfaceCustomizer.class.toString() + "ifcBefore";
+
+    public InterfaceCustomizer(final vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Interface> id,
+                                       @Nonnull final Interface dataAfter,
+                                       @Nonnull final Context writeContext) {
+        writeContext.put(IFC_AFTER_CTX, dataAfter);
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Interface> id,
+                                        @Nonnull final Interface dataBefore,
+                                        @Nonnull final Interface dataAfter,
+                                        @Nonnull final Context writeContext) {
+        writeContext.put(IFC_BEFORE_CTX, dataBefore);
+        writeContext.put(IFC_AFTER_CTX, dataAfter);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Interface> id,
+                                        @Nonnull final Interface dataBefore,
+                                        @Nonnull final Context writeContext) {
+        writeContext.put(IFC_BEFORE_CTX, dataBefore);
+    }
+
+    @Nonnull
+    @Override
+    public List<Interface> extract(@Nonnull final InstanceIdentifier<Interface> currentId,
+                                   @Nonnull final DataObject parentData) {
+        return ((Interfaces) parentData).getInterface();
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/L2Customizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/L2Customizer.java
new file mode 100644
index 000000000..e596f8fbf
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/L2Customizer.java
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiInvocationException;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.L2;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.l2.Interconnection;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.l2.interconnection.BridgeBased;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.l2.interconnection.XconnectBased;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class L2Customizer extends VppApiCustomizer implements ChildWriterCustomizer<L2> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(L2Customizer.class);
+
+    public L2Customizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<L2> extract(@Nonnull final InstanceIdentifier<L2> currentId, @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((VppInterfaceAugmentation) parentData).getL2());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<L2> id, @Nonnull final L2 dataAfter,
+                                       @Nonnull final Context writeContext)
+        throws WriteFailedException {
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+
+        final int swIfc = getSwIfc(ifc);
+        try {
+            setL2(id, swIfc, ifc, dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Write of L2 failed", e);
+            throw new WriteFailedException.CreateFailedException(id, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<L2> id, @Nonnull final L2 dataBefore,
+                                        @Nonnull final L2 dataAfter, @Nonnull final Context writeContext)
+        throws WriteFailedException {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+        final Interface ifcAfter = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        final int swIfc = getSwIfc(ifcBefore);
+        // TODO handle update properly (if possible)
+        try {
+            setL2(id, swIfc, ifcAfter, dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of L2 failed", e);
+            throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter, e);
+        }
+    }
+
+    private int getSwIfc(final Interface ifcBefore) {
+        int swIfcIndex = getVppApi().swIfIndexFromName(ifcBefore.getName());
+        checkArgument(swIfcIndex != -1, "Interface %s does not exist", ifcBefore.getName());
+        return swIfcIndex;
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<L2> id, @Nonnull final L2 dataBefore,
+                                        @Nonnull final Context writeContext) {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        final int swIfc = getSwIfc(ifcBefore);
+        // TODO implement delete (if possible)
+    }
+
+    private void setL2(final InstanceIdentifier<L2> id, final int swIfIndex, final Interface ifc, final L2 vppL2)
+        throws VppApiInvocationException, WriteFailedException {
+        LOG.debug("Setting L2 for interface: %s", ifc.getName());
+        // Nothing besides interconnection here
+        setInterconnection(id, swIfIndex, ifc, vppL2);
+    }
+
+    private void setInterconnection(final InstanceIdentifier<L2> id, final int swIfIndex, final Interface ifc,
+                                    final L2 vppL2)
+        throws VppApiInvocationException, WriteFailedException {
+        Interconnection ic = vppL2.getInterconnection();
+        if (ic instanceof XconnectBased) {
+            setXconnectBasedL2(swIfIndex, ifc, (XconnectBased) ic);
+        } else if (ic instanceof BridgeBased) {
+            setBridgeBasedL2(swIfIndex, ifc, (BridgeBased) ic);
+        } else {
+            // FIXME how does choice extensibility work
+            // FIXME it is not even possible to create a dedicated customizer for Interconnection, since it's not a DataObject
+            // FIXME we might need a choice customizer
+            // THis choice is already from augment, so its probably not possible to augment augmented choice
+            LOG.error("Unable to handle Interconnection of type {}", ic.getClass());
+            throw new WriteFailedException(id, "Unable to handle Interconnection of type " + ic.getClass());
+        }
+    }
+
+    private void setBridgeBasedL2(final int swIfIndex, final Interface ifc, final BridgeBased bb)
+        throws VppApiInvocationException {
+
+        LOG.debug("Setting bridge based interconnection(bridge-domain=%s) for interface: %s",
+            bb.getBridgeDomain(), ifc.getName());
+
+        String bdName = bb.getBridgeDomain();
+        int bdId = getVppApi().bridgeDomainIdFromName(bdName);
+        checkArgument(bdId > 0, "Unable to set Interconnection for Interface: %s, bridge domain: %s does not exist",
+            ifc.getName(), bdName);
+
+        byte bvi = bb.isBridgedVirtualInterface()
+            ? (byte) 1
+            : (byte) 0;
+        byte shg = bb.getSplitHorizonGroup().byteValue();
+
+        final int ctxId = getVppApi().swInterfaceSetL2Bridge(swIfIndex, bdId, shg, bvi, (byte) 1 /* enable */);
+        final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+
+        if (rv < 0) {
+            LOG.warn("Failed to update bridge based interconnection flags for: {}, interconnection: {}", ifc.getName(),
+                bb);
+            throw new VppApiInvocationException("swInterfaceSetL2Bridge", ctxId, rv);
+        } else {
+            LOG.debug("Bridge based interconnection updated successfully for: {}, interconnection: {}", ifc.getName(),
+                bb);
+        }
+    }
+
+    private void setXconnectBasedL2(final int swIfIndex, final Interface ifc, final XconnectBased ic)
+        throws VppApiInvocationException {
+
+        String outSwIfName = ic.getXconnectOutgoingInterface();
+        LOG.debug("Setting xconnect based interconnection(outgoing ifc=%s) for interface: %s", outSwIfName,
+            ifc.getName());
+
+        int outSwIfIndex = getVppApi().swIfIndexFromName(outSwIfName);
+        checkArgument(outSwIfIndex > 0,
+            "Unable to set Interconnection for Interface: %s, outgoing interface: %s does not exist",
+            ifc.getName(), outSwIfIndex);
+
+        int ctxId = getVppApi().swInterfaceSetL2Xconnect(swIfIndex, outSwIfIndex, (byte) 1 /* enable */);
+        final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+
+        if (rv < 0) {
+            LOG.warn("Failed to update xconnect based interconnection flags for: {}, interconnection: {}",
+                ifc.getName(), ic);
+            throw new VppApiInvocationException("swInterfaceSetL2Xconnect", ctxId, rv);
+        } else {
+            LOG.debug("Xconnect based interconnection updated successfully for: {}, interconnection: {}", ifc.getName(),
+                ic);
+        }
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/RoutingCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/RoutingCustomizer.java
new file mode 100644
index 000000000..8d930d80c
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/RoutingCustomizer.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiInvocationException;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Routing;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class RoutingCustomizer extends VppApiCustomizer implements ChildWriterCustomizer<Routing> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(RoutingCustomizer.class);
+
+    public RoutingCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Routing> extract(@Nonnull final InstanceIdentifier<Routing> currentId,
+                                     @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((VppInterfaceAugmentation) parentData).getRouting());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Routing> id,
+                                       @Nonnull final Routing dataAfter, @Nonnull final Context writeContext)
+        throws WriteFailedException.CreateFailedException {
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+
+        try {
+            setRouting(ifc.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of Routing failed", e);
+            throw new WriteFailedException.CreateFailedException(id, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Routing> id,
+                                        @Nonnull final Routing dataBefore, @Nonnull final Routing dataAfter,
+                                        @Nonnull final Context writeContext)
+        throws WriteFailedException.UpdateFailedException {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+        final Interface ifcAfter = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        try {
+            // TODO handle updates properly
+            setRouting(ifcAfter.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of Routing failed", e);
+            throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Routing> id,
+                                        @Nonnull final Routing dataBefore, @Nonnull final Context writeContext) {
+        // TODO implement delete
+    }
+
+    private void setRouting(final String name, final Routing rt) throws VppApiInvocationException {
+        final int swIfc = getSwIfc(name);
+        LOG.debug("Setting routing for interface: {}, {}. Routing: {}", name, swIfc, rt);
+
+        int vrfId = (rt != null)
+            ? rt.getVrfId().intValue()
+            : 0;
+
+        if (vrfId != 0) {
+            final int ctxId = getVppApi().swInterfaceSetTable(swIfc, (byte) 0, /* isIpv6 */ vrfId);
+            final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+            if (rv < 0) {
+                LOG.debug("Failed to set routing for interface: {}, {}, vxlan: {}", name, swIfc, rt);
+                throw new VppApiInvocationException("swInterfaceSetTable", ctxId, rv);
+            } else {
+                LOG.debug("Routing set successfully for interface: {}, {}, routing: {}", name, swIfc, rt);
+            }
+        }
+    }
+
+    private int getSwIfc(final String name) {
+        int swIfcIndex = getVppApi().swIfIndexFromName(name);
+        checkArgument(swIfcIndex != -1, "Interface %s does not exist", name);
+        return swIfcIndex;
+    }
+
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VppInterfaceCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VppInterfaceCustomizer.java
new file mode 100644
index 000000000..3ea3f9743
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VppInterfaceCustomizer.java
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiInvocationException;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev140508.EthernetCsmacd;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.InterfaceType;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VxlanTunnel;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class VppInterfaceCustomizer extends VppApiCustomizer
+    implements ChildWriterCustomizer<VppInterfaceAugmentation> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(VppInterfaceCustomizer.class);
+
+    public VppInterfaceCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<VppInterfaceAugmentation> extract(
+        @Nonnull final InstanceIdentifier<VppInterfaceAugmentation> currentId,
+        @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((Interface) parentData).getAugmentation(VppInterfaceAugmentation.class));
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<VppInterfaceAugmentation> id,
+                                       @Nonnull final VppInterfaceAugmentation dataAfter,
+                                       @Nonnull final Context writeContext)
+        throws WriteFailedException {
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+        try {
+            setInterface(id, ifc, dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of VppInterfaceAugment failed", e);
+            throw new WriteFailedException.CreateFailedException(id, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<VppInterfaceAugmentation> id,
+                                        @Nonnull final VppInterfaceAugmentation dataBefore,
+                                        @Nonnull final VppInterfaceAugmentation dataAfter,
+                                        @Nonnull final Context writeContext)
+        throws WriteFailedException.UpdateFailedException {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+        try {
+            updateInterface(id, ifc, dataBefore, dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of VppInterfaceAugment failed", e);
+            throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<VppInterfaceAugmentation> id,
+                                        @Nonnull final VppInterfaceAugmentation dataBefore,
+                                        @Nonnull final Context writeContext) {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        LOG.info("Deleting interface: {}, type: {}", ifcBefore.getName(), ifcBefore.getType().getSimpleName());
+
+        if (ifcBefore.getType().isAssignableFrom(EthernetCsmacd.class)) {
+            LOG.error("Interface {}, type: {} cannot be deleted",
+                ifcBefore.getName(), ifcBefore.getType().getSimpleName());
+
+        /* FIXME: Add additional interface types here.
+         *
+         * } else if (swIf.getType().isAssignableFrom(*.class)) {
+         */
+
+        }
+    }
+
+
+    private void updateInterface(final InstanceIdentifier<VppInterfaceAugmentation> id, final Interface swIf,
+                                 final VppInterfaceAugmentation dataBefore,
+                                 final VppInterfaceAugmentation dataAfter) throws VppApiInvocationException {
+        LOG.info("Updating interface {}, type: {}", swIf.getName(), swIf.getType().getSimpleName());
+        LOG.debug("Updating interface {}", swIf);
+
+        Class<? extends InterfaceType> ifType = checkNotNull(swIf.getType(), "Interface type missing for %s", swIf);
+        String swIfName = swIf.getName();
+        int swIfIndex = getVppApi().swIfIndexFromName(swIfName);
+        checkArgument(swIfIndex != -1, "Updating non-existing vpp interface: %s", swIfName);
+
+        // TODO handle updates properly
+
+        if (VxlanTunnel.class.isAssignableFrom(ifType)) {
+            updateVxlanTunnelInterface(swIf);
+        } else if (EthernetCsmacd.class.isAssignableFrom(ifType)) {
+            updateEthernetCsmacdInterface(swIf, swIfName, swIfIndex);
+        }
+    }
+
+
+    private void setInterface(final InstanceIdentifier<VppInterfaceAugmentation> id, final Interface swIf,
+                              final VppInterfaceAugmentation dataAfter)
+        throws VppApiInvocationException, WriteFailedException {
+        LOG.info("Setting interface {}, type: {}", swIf.getName(), swIf.getType().getSimpleName());
+        LOG.debug("Setting interface {}", swIf);
+
+        Class<? extends InterfaceType> ifType = checkNotNull(swIf.getType(), "Interface type missing for %s", swIf);
+        String swIfName = swIf.getName();
+        int swIfIndex = getVppApi().swIfIndexFromName(swIfName);
+        checkArgument(swIfIndex == -1, "Creating already-existing vpp interface: %s", swIfName);
+
+        if (VxlanTunnel.class.isAssignableFrom(ifType)) {
+            createVxlanTunnelInterface(swIf, swIfName);
+        } else if (EthernetCsmacd.class.isAssignableFrom(ifType)) {
+            createEthernetCsmacdInterface(id, swIfName, dataAfter);
+        }
+    }
+
+    private void createVxlanTunnelInterface(final Interface swIf, final String swIfName)
+        throws VppApiInvocationException {
+        LOG.debug("Creating {} interface {}", swIf.getType().getSimpleName(), swIf.getName());
+
+        // FIXME, Vxlan child writer needs to be handled before this is
+        int newSwIfIndex = getVppApi().swIfIndexFromName(swIfName);
+
+        setInterfaceFlags(swIfName, newSwIfIndex, swIf.isEnabled()
+            ? (byte) 1
+            : (byte) 0);
+        setDescription(swIf);
+    }
+
+    private void updateVxlanTunnelInterface(final Interface swIf) {
+        LOG.debug("Updating {} interface {}", swIf.getType().getSimpleName(), swIf.getName());
+
+        // TODO handle
+    }
+
+    private void createEthernetCsmacdInterface(final InstanceIdentifier<VppInterfaceAugmentation> id,
+                                               final String swIfName, final VppInterfaceAugmentation dataAfter) throws WriteFailedException {
+        LOG.warn("Unable to create interface: {}, type: {}", swIfName, EthernetCsmacd.class);
+        throw new WriteFailedException.CreateFailedException(id, dataAfter);
+    }
+
+    private void updateEthernetCsmacdInterface(final Interface swIf,
+                                               final String swIfName, final int swIfIndex)
+        throws VppApiInvocationException {
+        LOG.debug("Updating {} interface {}", swIf.getType().getSimpleName(), swIf.getName());
+        byte enabled = swIf.isEnabled()
+            ? (byte) 1
+            : (byte) 0;
+        setInterfaceFlags(swIfName, swIfIndex, enabled);
+        setDescription(swIf);
+    }
+
+    private void setInterfaceFlags(final String swIfName, final int swIfIndex, final byte enabled)
+        throws VppApiInvocationException {
+        int ctxId = getVppApi().swInterfaceSetFlags(swIfIndex, enabled, enabled, (byte) 0 /* deleted */);
+
+        LOG.debug("Updating interface flags for: {}, index: {}, enabled: {}, ctxId: {}", swIfName, swIfIndex,
+            enabled, ctxId);
+
+        final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+        if (rv < 0) {
+            LOG.warn("Failed to update interface flags for: {}, index: {}, enabled: {}, ctxId: {}", swIfName, swIfIndex,
+                enabled, ctxId);
+            throw new VppApiInvocationException("swInterfaceSetFlags", ctxId, rv);
+        } else {
+            LOG.debug("Interface flags updated successfully for: {}, index: {}, enabled: {}, ctxId: {}",
+                swIfName, swIfIndex, enabled, ctxId);
+        }
+    }
+
+    private void setDescription(final Interface swIf) {
+        if (swIf.getDescription() != null) {
+            getVppApi().setInterfaceDescription(swIf.getName(), swIf.getDescription());
+        } else {
+            getVppApi().setInterfaceDescription(swIf.getName(), "");
+        }
+    }
+
+}
+
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VxlanCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VxlanCustomizer.java
new file mode 100644
index 000000000..2b2774ece
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/VxlanCustomizer.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiInvocationException;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VxlanTunnel;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Vxlan;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class VxlanCustomizer extends VppApiCustomizer implements ChildWriterCustomizer<Vxlan> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(VxlanCustomizer.class);
+
+
+    public VxlanCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Vxlan> extract(@Nonnull final InstanceIdentifier<Vxlan> currentId,
+                                   @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((VppInterfaceAugmentation) parentData).getVxlan());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Vxlan> id, @Nonnull final Vxlan dataAfter,
+                                       @Nonnull final Context writeContext)
+        throws WriteFailedException.CreateFailedException {
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+        try {
+            createVxlanTunnel(ifc.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Write of Vxlan failed", e);
+            throw new WriteFailedException.CreateFailedException(id, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Vxlan> id, @Nonnull final Vxlan dataBefore,
+                                        @Nonnull final Vxlan dataAfter, @Nonnull final Context writeContext)
+        throws WriteFailedException.UpdateFailedException {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+        final Interface ifcAfter = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        // TODO handle update in a better way
+        try {
+            createVxlanTunnel(ifcAfter.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of L2 failed", e);
+            throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Vxlan> id, @Nonnull final Vxlan dataBefore,
+                                        @Nonnull final Context writeContext) {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        // TODO handle delete
+    }
+
+    private void createVxlanTunnel(final String swIfName, final Vxlan vxlan) throws VppApiInvocationException {
+        Ipv4Address srcAddress = vxlan.getSrc();
+        Ipv4Address dstAddress = vxlan.getDst();
+
+        int srcAddr = V3poUtils.parseIp(srcAddress.getValue());
+        int dstAddr = V3poUtils.parseIp(dstAddress.getValue());
+        int encapVrfId = vxlan.getEncapVrfId().intValue();
+        int vni = vxlan.getVni().getValue().intValue();
+
+        LOG.debug("Setting vxlan tunnel for interface: {}. Vxlan: {}", swIfName, vxlan);
+        int ctxId = getVppApi().vxlanAddDelTunnel((byte) 1 /* is add */, srcAddr, dstAddr, encapVrfId, -1, vni);
+        final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+        if (rv < 0) {
+            LOG.debug("Failed to set vxlan tunnel for interface: {}, vxlan: {}", swIfName, vxlan);
+            throw new VppApiInvocationException("vxlanAddDelTunnel", ctxId, rv);
+        } else {
+            LOG.debug("Vxlan tunnel set successfully for: {}, vxlan: {}", swIfName, vxlan);
+            // FIXME avoid this dump just to fill cache in vpp-japi
+            // refresh interfaces to be able to get ifIndex
+            getVppApi().swInterfaceDump((byte) 1, V3poUtils.IFC_TYPES.inverse().get(VxlanTunnel.class).getBytes());
+        }
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Interface1Customizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Interface1Customizer.java
new file mode 100644
index 000000000..9f3584908
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Interface1Customizer.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces.ip;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.Interface1;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class Interface1Customizer extends VppApiCustomizer implements ChildWriterCustomizer<Interface1> {
+
+    public Interface1Customizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Interface1> extract(@Nonnull final InstanceIdentifier<Interface1> currentId,
+                                        @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((Interface) parentData).getAugmentation(Interface1.class));
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Interface1> id,
+                                       @Nonnull final Interface1 dataAfter, @Nonnull final Context writeContext) {
+
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Interface1> id,
+                                        @Nonnull final Interface1 dataBefore, @Nonnull final Interface1 dataAfter,
+                                        @Nonnull final Context writeContext) {
+
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Interface1> id,
+                                        @Nonnull final Interface1 dataBefore, @Nonnull final Context writeContext) {
+
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv4Customizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv4Customizer.java
new file mode 100644
index 000000000..08974fe68
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv4Customizer.java
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces.ip;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.InterfaceCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiInvocationException;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
+import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.Interface1;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.Ipv4;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.Subnet;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.Netmask;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.PrefixLength;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class Ipv4Customizer extends VppApiCustomizer implements ChildWriterCustomizer<Ipv4> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Ipv4Customizer.class);
+
+    public Ipv4Customizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Ipv4> extract(@Nonnull final InstanceIdentifier<Ipv4> currentId,
+                                  @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((Interface1) parentData).getIpv4());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv4> id,
+                                       @Nonnull final Ipv4 dataAfter, @Nonnull final Context writeContext)
+        throws WriteFailedException {
+        final Interface ifc = (Interface) writeContext.get(InterfaceCustomizer.IFC_AFTER_CTX);
+
+        try {
+            setIpv4(id, ifc.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Create of Ipv4 failed", e);
+            throw new WriteFailedException.CreateFailedException(id, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv4> id,
+                                        @Nonnull final Ipv4 dataBefore, @Nonnull final Ipv4 dataAfter,
+                                        @Nonnull final Context writeContext)
+        throws WriteFailedException {
+        final Interface ifcBefore = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+        final Interface ifcAfter = (Interface) writeContext.get(InterfaceCustomizer.IFC_BEFORE_CTX);
+
+        // TODO handle update in a better way
+        try {
+            setIpv4(id, ifcAfter.getName(), dataAfter);
+        } catch (VppApiInvocationException e) {
+            LOG.warn("Update of Ipv4 failed", e);
+            throw new WriteFailedException.UpdateFailedException(id, dataBefore, dataAfter, e);
+        }
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv4> id,
+                                        @Nonnull final Ipv4 dataBefore, @Nonnull final Context writeContext) {
+        // TODO implement delete
+    }
+
+    private void setIpv4(final InstanceIdentifier<Ipv4> id, final String name, final Ipv4 ipv4)
+        throws WriteFailedException, VppApiInvocationException {
+        final int swIfc = getSwIfc(name);
+
+        for (Address ipv4Addr : ipv4.getAddress()) {
+            Subnet subnet = ipv4Addr.getSubnet();
+
+            if (subnet instanceof PrefixLength) {
+                setPrefixLengthSubnet(name, swIfc, ipv4Addr, (PrefixLength) subnet);
+            } else if (subnet instanceof Netmask) {
+                setNetmaskSubnet();
+            } else {
+                // FIXME how does choice extensibility work
+                // FIXME it is not even possible to create a dedicated customizer for Interconnection, since it's not a DataObject
+                // FIXME we might need a choice customizer
+                // THis choice is already from augment, so its probably not possible to augment augmented choice
+                LOG.error("Unable to handle subnet of type {}", subnet.getClass());
+                throw new WriteFailedException(id, "Unable to handle subnet of type " + subnet.getClass());
+            }
+        }
+    }
+
+    private void setNetmaskSubnet() {
+        // FIXME
+        throw new UnsupportedOperationException("Unimplemented");
+    }
+
+    private void setPrefixLengthSubnet(final String name, final int swIfc, final Address ipv4Addr,
+                                       final PrefixLength subnet) throws VppApiInvocationException {
+        Short plen = subnet.getPrefixLength();
+        LOG.debug("Setting Subnet(prefix-length) for interface: {}, {}. Subnet: {}, Ipv4: {}", name, swIfc, subnet,
+            ipv4Addr);
+
+        byte[] addr = V3poUtils.ipv4AddressNoZoneToArray(ipv4Addr.getIp());
+
+        checkArgument(plen > 0, "Invalid length");
+        checkNotNull(addr, "Null address");
+
+        final int ctxId = getVppApi().swInterfaceAddDelAddress(swIfc, (byte) 1 /* isAdd */, (byte) 0 /* isIpv6 */,
+            (byte) 0 /* delAll */, plen.byteValue(), addr);
+
+        final int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
+        if (rv < 0) {
+            LOG.warn("Failed to set Subnet(prefix-length) for interface: {}, {},  Subnet: {}, Ipv4: {}", name, swIfc,
+                subnet, ipv4Addr);
+            throw new VppApiInvocationException("swInterfaceAddDelAddress", ctxId, rv);
+        } else {
+            LOG.debug("Subnet(prefix-length) set successfully for interface: {}, {},  Subnet: {}, Ipv4: {}", name,
+                swIfc, subnet, ipv4Addr);
+        }
+    }
+
+
+    private int getSwIfc(final String name) {
+        int swIfcIndex = getVppApi().swIfIndexFromName(name);
+        checkArgument(swIfcIndex != -1, "Interface %s does not exist", name);
+        return swIfcIndex;
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv6Customizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv6Customizer.java
new file mode 100644
index 000000000..3798f891a
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/interfaces/ip/Ipv6Customizer.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.interfaces.ip;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.Interface1;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.Ipv6;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class Ipv6Customizer extends VppApiCustomizer implements ChildWriterCustomizer<Ipv6> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Ipv6Customizer.class);
+
+    public Ipv6Customizer(final org.openvpp.vppjapi.vppApi vppApi) {
+        super(vppApi);
+    }
+
+    @Nonnull
+    @Override
+    public Optional<Ipv6> extract(@Nonnull final InstanceIdentifier<Ipv6> currentId,
+                                      @Nonnull final DataObject parentData) {
+        return Optional.fromNullable(((Interface1) parentData).getIpv6());
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv6> id,
+                                       @Nonnull final Ipv6 dataAfter, @Nonnull final Context writeContext) {
+        // TODO
+        LOG.warn("Unsupported, ignoring configuration {}", dataAfter);
+    }
+
+    @Override
+    public void updateCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv6> id,
+                                        @Nonnull final Ipv6 dataBefore, @Nonnull final Ipv6 dataAfter,
+                                        @Nonnull final Context writeContext) {
+        LOG.warn("Unsupported, ignoring configuration {}", dataAfter);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Ipv6> id,
+                                        @Nonnull final Ipv6 dataBefore, @Nonnull final Context writeContext) {
+        LOG.warn("Unsupported, ignoring configuration delete {}", id);
+        // TODO
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/utils/V3poUtils.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/utils/V3poUtils.java
new file mode 100644
index 000000000..18a8103cc
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/utils/V3poUtils.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.v3po.translate.v3po.utils;
+
+import com.google.common.base.Splitter;
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev140508.EthernetCsmacd;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.iana._if.type.rev140508.SoftwareLoopback;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4AddressNoZone;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.InterfaceType;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VxlanTunnel;
+import org.openvpp.vppjapi.vppApi;
+
+public final class V3poUtils {
+
+    // TODO move to vpp-translate-utils
+
+    public static final int RESPONSE_NOT_READY = -77;
+    public static final int RELEASE = 1;
+    public static final Splitter DOT_SPLITTER = Splitter.on('.');
+    public static final BiMap<String, Class<? extends InterfaceType>> IFC_TYPES = HashBiMap.create();
+    static {
+        V3poUtils.IFC_TYPES.put("vxlan", VxlanTunnel.class);
+        V3poUtils.IFC_TYPES.put("lo", SoftwareLoopback.class);
+        V3poUtils.IFC_TYPES.put("Ether", EthernetCsmacd.class);
+        // TODO missing types below
+//        V3poUtils.IFC_TYPES.put("l2tpv3_tunnel", EthernetCsmacd.class);
+//        V3poUtils.IFC_TYPES.put("tap", EthernetCsmacd.class);
+    }
+
+    private V3poUtils() {}
+
+    public static int waitForResponse(final int ctxId, final vppApi vppApi) {
+        int rv;
+        while ((rv = vppApi.getRetval(ctxId, RELEASE)) == RESPONSE_NOT_READY) {
+            // TODO limit attempts
+        }
+        return rv;
+    }
+
+    public static int parseIp(final String address) {
+        int result = 0;
+
+        // iterate over each octet
+        for (String part : DOT_SPLITTER.split(address)) {
+            // shift the previously parsed bits over by 1 byte
+            result = result << 8;
+            // set the low order bits to the current octet
+            result |= Integer.parseInt(part);
+        }
+        return result;
+    }
+
+    public static byte[] ipv4AddressNoZoneToArray(final Ipv4AddressNoZone ipv4Addr) {
+        byte[] retval = new byte[4];
+        String[] dots = ipv4Addr.getValue().split("\\.");
+
+        for (int d = 3; d >= 0; d--) {
+            retval[d] = (byte) (Short.parseShort(dots[3 - d]) & 0xff);
+        }
+        return retval;
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/vpp/BridgeDomainCustomizer.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/vpp/BridgeDomainCustomizer.java
index ffbc95beb..c69f2ef0a 100644
--- a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/vpp/BridgeDomainCustomizer.java
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/v3po/translate/v3po/vpp/BridgeDomainCustomizer.java
@@ -23,6 +23,7 @@ import static com.google.common.base.Preconditions.checkState;
 import io.fd.honeycomb.v3po.translate.spi.write.ListWriterCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.util.VppApiCustomizer;
 import io.fd.honeycomb.v3po.translate.Context;
+import io.fd.honeycomb.v3po.translate.v3po.utils.V3poUtils;
 import java.util.List;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -41,8 +42,6 @@ public class BridgeDomainCustomizer
     private static final Logger LOG = LoggerFactory.getLogger(BridgeDomainCustomizer.class);
 
     private static final byte ADD_OR_UPDATE_BD = (byte) 1;
-    private static final int RESPONSE_NOT_READY = -77;
-    private static final int RELEASE = 1;
 
     public BridgeDomainCustomizer(final org.openvpp.vppjapi.vppApi api) {
         super(api);
@@ -55,14 +54,6 @@ public class BridgeDomainCustomizer
         return ((BridgeDomains) parentData).getBridgeDomain();
     }
 
-    private int waitForResponse(final int ctxId) {
-        int rv;
-        while ((rv = getVppApi().getRetval(ctxId, RELEASE)) == RESPONSE_NOT_READY) {
-            // TODO limit attempts
-        }
-        return rv;
-    }
-
     private int addOrUpdateBridgeDomain(final int bdId, @Nonnull final BridgeDomain bd) {
         byte flood = booleanToByte(bd.isFlood());
         byte forward = booleanToByte(bd.isForward());
@@ -71,7 +62,7 @@ public class BridgeDomainCustomizer
         byte arpTerm = booleanToByte(bd.isArpTermination());
 
         int ctxId = getVppApi().bridgeDomainAddDel(bdId, flood, forward, learn, uuf, arpTerm, ADD_OR_UPDATE_BD);
-        return waitForResponse(ctxId);
+        return V3poUtils.waitForResponse(ctxId, getVppApi());
     }
 
     @Override
@@ -111,7 +102,7 @@ public class BridgeDomainCustomizer
             (byte) 0 /* arpTerm */,
             (byte) 0 /* isAdd */);
 
-        int rv = waitForResponse(ctxId);
+        int rv = V3poUtils.waitForResponse(ctxId, getVppApi());
 
         checkState(rv >= 0, "Bridge domain delete failed. Return code: %s", rv);
         LOG.debug("Bridge domain {} deleted as {} successfully", bdName, bdId);
diff --git a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModule.java b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModule.java
new file mode 100644
index 000000000..4710d9e1a
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModule.java
@@ -0,0 +1,114 @@
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406;
+
+import com.google.common.collect.Lists;
+import io.fd.honeycomb.v3po.translate.impl.TraversalType;
+import io.fd.honeycomb.v3po.translate.impl.write.CompositeChildWriter;
+import io.fd.honeycomb.v3po.translate.impl.write.CompositeListWriter;
+import io.fd.honeycomb.v3po.translate.impl.write.CompositeRootWriter;
+import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.util.write.CloseableWriter;
+import io.fd.honeycomb.v3po.translate.util.write.NoopWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.util.write.ReflexiveChildWriterCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.EthernetCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.InterfaceCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.L2Customizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.RoutingCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.VppInterfaceCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.VxlanCustomizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.ip.Ipv4Customizer;
+import io.fd.honeycomb.v3po.translate.v3po.interfaces.ip.Ipv6Customizer;
+import io.fd.honeycomb.v3po.translate.write.ChildWriter;
+import java.util.ArrayList;
+import java.util.List;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.Interfaces;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.Interface1;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.Ipv4;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.Ipv6;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Ethernet;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.L2;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Routing;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.interfaces._interface.Vxlan;
+import org.opendaylight.yangtools.yang.binding.Augmentation;
+import org.opendaylight.yangtools.yang.binding.ChildOf;
+
+public class InterfacesHoneycombWriterModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.AbstractInterfacesHoneycombWriterModule {
+    public InterfacesHoneycombWriterModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
+        super(identifier, dependencyResolver);
+    }
+
+    public InterfacesHoneycombWriterModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver, org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.InterfacesHoneycombWriterModule oldModule, java.lang.AutoCloseable oldInstance) {
+        super(identifier, dependencyResolver, oldModule, oldInstance);
+    }
+
+    @Override
+    public void customValidation() {
+        // add custom validation form module attributes here.
+    }
+
+    @Override
+    public java.lang.AutoCloseable createInstance() {
+
+        final List<ChildWriter<? extends Augmentation<Interface>>> ifcAugmentations = Lists.newArrayList();
+        ifcAugmentations.add(getVppIfcAugmentationWriter());
+
+        final ChildWriter<Interface> interfaceWriter = new CompositeListWriter<>(Interface.class,
+            RWUtils.<Interface>emptyChildWriterList(),
+            ifcAugmentations,
+            new InterfaceCustomizer(getVppJapiIfcDependency()));
+
+        final List<ChildWriter<? extends ChildOf<Interfaces>>> childWriters = new ArrayList<>();
+        childWriters.add(interfaceWriter);
+
+        // FIXME if we just return the root writer and cfg subsystem takes care to set it into reader registry,
+        // we loose the ordering information for root writers
+        // Or can we rely to the order in which readers are configured ?
+        return new CloseableWriter<>(new CompositeRootWriter<>(Interfaces.class,
+            childWriters, new NoopWriterCustomizer<Interfaces>()));
+    }
+
+    private ChildWriter<? extends Augmentation<Interface>> getInterface1AugmentationWriter() {
+        final ChildWriter<Ipv4> ipv4Writer = new CompositeChildWriter<>(Ipv4.class,
+            new Ipv4Customizer(getVppJapiIfcDependency()));
+        final ChildWriter<Ipv6> ipv6Writer = new CompositeChildWriter<>(Ipv6.class,
+            new Ipv6Customizer(getVppJapiIfcDependency()));
+
+        final List<ChildWriter<? extends ChildOf<Interface1>>> interface1ChildWriters = Lists.newArrayList();
+        interface1ChildWriters.add(ipv4Writer);
+        interface1ChildWriters.add(ipv6Writer);
+
+        return new CompositeChildWriter<>(Interface1.class,
+            interface1ChildWriters, new ReflexiveChildWriterCustomizer<Interface1>());
+    }
+
+    private ChildWriter<VppInterfaceAugmentation> getVppIfcAugmentationWriter() {
+
+        final ChildWriter<Ethernet> ethernetWriter = new CompositeChildWriter<>(Ethernet.class,
+            new EthernetCustomizer(getVppJapiIfcDependency()));
+
+        final ChildWriter<Routing> routingWriter = new CompositeChildWriter<>(Routing.class,
+            new RoutingCustomizer(getVppJapiIfcDependency()));
+
+        final ChildWriter<Vxlan> vxlanWriter = new CompositeChildWriter<>(Vxlan.class,
+            new VxlanCustomizer(getVppJapiIfcDependency()));
+
+        final ChildWriter<L2> l2Writer = new CompositeChildWriter<>(L2.class,
+            new L2Customizer(getVppJapiIfcDependency()));
+
+        final List<ChildWriter<? extends ChildOf<VppInterfaceAugmentation>>> vppIfcChildWriters = Lists.newArrayList();
+        // TODO what's the order here ?
+        vppIfcChildWriters.add(ethernetWriter);
+        vppIfcChildWriters.add(vxlanWriter);
+        vppIfcChildWriters.add(l2Writer);
+        vppIfcChildWriters.add(routingWriter);
+
+        return new CompositeChildWriter<>(VppInterfaceAugmentation.class,
+            vppIfcChildWriters,
+            RWUtils.<VppInterfaceAugmentation>emptyAugWriterList(),
+            new VppInterfaceCustomizer(getVppJapiIfcDependency()),
+            // It's important that this customizer is handled in a postorder way, because you first have to handle child nodes
+            // e.g. Vxlan before setting other interface or vppInterfaceAugmentation leaves
+            TraversalType.POSTORDER);
+    }
+}
diff --git a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModuleFactory.java b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModuleFactory.java
new file mode 100644
index 000000000..9332d3017
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesHoneycombWriterModuleFactory.java
@@ -0,0 +1,13 @@
+/*
+* Generated file
+*
+* Generated from: yang module name: v3po2vpp yang module local name: interfaces-honeycomb-writer
+* Generated by: org.opendaylight.controller.config.yangjmxgenerator.plugin.JMXGenerator
+* Generated at: Fri Apr 08 13:28:05 CEST 2016
+*
+* Do not modify this file unless it is present under src/main directory
+*/
+package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406;
+public class InterfacesHoneycombWriterModuleFactory extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.AbstractInterfacesHoneycombWriterModuleFactory {
+
+}
diff --git a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesStateHoneycombReaderModule.java b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesStateHoneycombReaderModule.java
index 5b79ff0d3..aa72a29af 100644
--- a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesStateHoneycombReaderModule.java
+++ b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/InterfacesStateHoneycombReaderModule.java
@@ -1,14 +1,11 @@
 package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406;
 
-import com.google.common.base.Optional;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeChildReader;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeListReader;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeRootReader;
 import io.fd.honeycomb.v3po.translate.read.ChildReader;
-import io.fd.honeycomb.v3po.translate.read.ReadContext;
-import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
-import io.fd.honeycomb.v3po.translate.read.Reader;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.util.read.CloseableReader;
 import io.fd.honeycomb.v3po.translate.util.read.ReflexiveRootReaderCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.interfacesstate.InterfaceCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.interfacesstate.VppInterfaceStateCustomizer;
@@ -17,14 +14,9 @@ import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.InterfaceBuilder;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.InterfaceKey;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceAugmentation;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppInterfaceStateAugmentation;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.openvpp.vppjapi.vppApi;
 
-import javax.annotation.Nonnull;
-
 public class InterfacesStateHoneycombReaderModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.AbstractInterfacesStateHoneycombReaderModule {
     public InterfacesStateHoneycombReaderModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
         super(identifier, dependencyResolver);
@@ -53,44 +45,10 @@ public class InterfacesStateHoneycombReaderModule extends org.opendaylight.yang.
                         RWUtils.<Interface>singletonAugReaderList(vppInterfaceStateAugmentationChildReader),
                         new InterfaceCustomizer(vppApi));
 
-        return new CloseableReader(new CompositeRootReader<>(
+        return new CloseableReader<>(new CompositeRootReader<>(
                 InterfacesState.class,
                 RWUtils.singletonChildReaderList(interfaceReader),
                 RWUtils.<InterfacesState>emptyAugReaderList(),
                 new ReflexiveRootReaderCustomizer<>(InterfacesStateBuilder.class)));
     }
-
-
-    private static final class CloseableReader implements Reader<InterfacesState>, AutoCloseable {
-
-        private CompositeRootReader<InterfacesState, InterfacesStateBuilder> compositeRootReader;
-
-        public CloseableReader(
-                final CompositeRootReader<InterfacesState, InterfacesStateBuilder> compositeRootReader) {
-            this.compositeRootReader = compositeRootReader;
-        }
-
-        @Nonnull
-        @Override
-        public Optional<? extends DataObject> read(@Nonnull InstanceIdentifier<? extends DataObject> id,
-                                                   @Nonnull ReadContext ctx) throws ReadFailedException {
-            return compositeRootReader.read(id, ctx);
-        }
-
-        @Nonnull
-        @Override
-        public InstanceIdentifier<InterfacesState> getManagedDataObjectType() {
-            return compositeRootReader.getManagedDataObjectType();
-        }
-
-        @Override
-        public String toString() {
-            return compositeRootReader.toString();
-        }
-
-        @Override
-        public void close() throws Exception {
-            //NOOP
-        }
-    }
 }
diff --git a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppHoneycombWriterModule.java b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppHoneycombWriterModule.java
index 5694bc139..a9eff593d 100644
--- a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppHoneycombWriterModule.java
+++ b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppHoneycombWriterModule.java
@@ -1,27 +1,21 @@
 package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406;
 
-import io.fd.honeycomb.v3po.translate.TranslationException;
 import io.fd.honeycomb.v3po.translate.impl.write.CompositeChildWriter;
 import io.fd.honeycomb.v3po.translate.impl.write.CompositeListWriter;
 import io.fd.honeycomb.v3po.translate.impl.write.CompositeRootWriter;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.util.write.CloseableWriter;
 import io.fd.honeycomb.v3po.translate.util.write.NoopWriterCustomizer;
 import io.fd.honeycomb.v3po.translate.util.write.ReflexiveChildWriterCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.vpp.BridgeDomainCustomizer;
 import io.fd.honeycomb.v3po.translate.write.ChildWriter;
-import io.fd.honeycomb.v3po.translate.write.WriteContext;
-import io.fd.honeycomb.v3po.translate.write.Writer;
 import java.util.ArrayList;
 import java.util.List;
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.Vpp;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.BridgeDomains;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomain;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.bridge.domains.BridgeDomainKey;
 import org.opendaylight.yangtools.yang.binding.ChildOf;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 
 public class VppHoneycombWriterModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.AbstractVppHoneycombWriterModule {
     public VppHoneycombWriterModule(org.opendaylight.controller.config.api.ModuleIdentifier identifier, org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
@@ -51,46 +45,10 @@ public class VppHoneycombWriterModule extends org.opendaylight.yang.gen.v1.urn.h
         final List<ChildWriter<? extends ChildOf<Vpp>>> childWriters = new ArrayList<>();
         childWriters.add(bridgeDomainsReader);
 
-        return new CloseableWriter(new CompositeRootWriter<>(
+        return new CloseableWriter<>(new CompositeRootWriter<>(
             Vpp.class,
             childWriters,
             new NoopWriterCustomizer<Vpp>()));
     }
 
-    // TODO move to translate-utils
-    private static final class CloseableWriter implements Writer<Vpp>, AutoCloseable {
-
-        private CompositeRootWriter<Vpp> vppCompositeRootWriter;
-
-        public CloseableWriter(
-            final CompositeRootWriter<Vpp> vppCompositeRootWriter) {
-            this.vppCompositeRootWriter = vppCompositeRootWriter;
-        }
-
-        @Override
-        public void update(
-            @Nonnull final InstanceIdentifier<? extends DataObject> id,
-            @Nullable final DataObject dataBefore,
-            @Nullable final DataObject dataAfter,
-            @Nonnull final WriteContext ctx) throws TranslationException {
-            vppCompositeRootWriter.update(id, dataBefore, dataAfter, ctx);
-        }
-
-        @Nonnull
-        @Override
-        public InstanceIdentifier<Vpp> getManagedDataObjectType() {
-            return vppCompositeRootWriter.getManagedDataObjectType();
-        }
-
-        @Override
-        public String toString() {
-            return vppCompositeRootWriter.toString();
-        }
-
-        @Override
-        public void close() throws Exception {
-
-        }
-    }
-
 }
diff --git a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppStateHoneycombReaderModule.java b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppStateHoneycombReaderModule.java
index 8da7dad1c..0e1d48035 100644
--- a/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppStateHoneycombReaderModule.java
+++ b/v3po/v3po2vpp/src/main/java/org/opendaylight/yang/gen/v1/urn/honeycomb/params/xml/ns/yang/v3po2vpp/rev160406/VppStateHoneycombReaderModule.java
@@ -1,21 +1,17 @@
 package org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406;
 
-import com.google.common.base.Optional;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeChildReader;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeListReader;
 import io.fd.honeycomb.v3po.translate.impl.read.CompositeRootReader;
 import io.fd.honeycomb.v3po.translate.read.ChildReader;
-import io.fd.honeycomb.v3po.translate.read.ReadContext;
-import io.fd.honeycomb.v3po.translate.read.ReadFailedException;
-import io.fd.honeycomb.v3po.translate.read.Reader;
 import io.fd.honeycomb.v3po.translate.util.RWUtils;
+import io.fd.honeycomb.v3po.translate.util.read.CloseableReader;
 import io.fd.honeycomb.v3po.translate.util.read.ReflexiveChildReaderCustomizer;
 import io.fd.honeycomb.v3po.translate.util.read.ReflexiveRootReaderCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.vppstate.BridgeDomainCustomizer;
 import io.fd.honeycomb.v3po.translate.v3po.vppstate.VersionCustomizer;
 import java.util.ArrayList;
 import java.util.List;
-import javax.annotation.Nonnull;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppState;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.VppStateBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.BridgeDomains;
@@ -25,8 +21,6 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev150105.vpp.state.bridge.domains.BridgeDomainKey;
 import org.opendaylight.yangtools.yang.binding.ChildOf;
-import org.opendaylight.yangtools.yang.binding.DataObject;
-import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.openvpp.vppjapi.vppApi;
 
 public class VppStateHoneycombReaderModule extends org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.v3po2vpp.rev160406.AbstractVppStateHoneycombReaderModule {
@@ -61,44 +55,11 @@ public class VppStateHoneycombReaderModule extends org.opendaylight.yang.gen.v1.
         childVppReaders.add(versionReader);
         childVppReaders.add(bridgeDomainsReader);
 
-        return new CloseableReader(new CompositeRootReader<>(
+        return new CloseableReader<>(new CompositeRootReader<>(
             VppState.class,
             childVppReaders,
             RWUtils.<VppState>emptyAugReaderList(),
             new ReflexiveRootReaderCustomizer<>(VppStateBuilder.class)));
     }
 
-    // TODO move to utils
-    private static final class CloseableReader implements Reader<VppState>, AutoCloseable {
-
-        private CompositeRootReader<VppState, VppStateBuilder> vppStateVppStateBuilderCompositeRootReader;
-
-        public CloseableReader(
-            final CompositeRootReader<VppState, VppStateBuilder> vppStateVppStateBuilderCompositeRootReader) {
-            this.vppStateVppStateBuilderCompositeRootReader = vppStateVppStateBuilderCompositeRootReader;
-        }
-
-        @Nonnull
-        @Override
-        public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id,
-                                                   @Nonnull final ReadContext ctx) throws ReadFailedException {
-            return vppStateVppStateBuilderCompositeRootReader.read(id, ctx);
-        }
-
-        @Nonnull
-        @Override
-        public InstanceIdentifier<VppState> getManagedDataObjectType() {
-            return vppStateVppStateBuilderCompositeRootReader.getManagedDataObjectType();
-        }
-
-        @Override
-        public String toString() {
-            return vppStateVppStateBuilderCompositeRootReader.toString();
-        }
-
-        @Override
-        public void close() throws Exception {
-            //NOOP
-        }
-    }
 }
diff --git a/v3po/v3po2vpp/src/main/yang/v3po2vpp.yang b/v3po/v3po2vpp/src/main/yang/v3po2vpp.yang
index 9d3199970..286feb987 100644
--- a/v3po/v3po2vpp/src/main/yang/v3po2vpp.yang
+++ b/v3po/v3po2vpp/src/main/yang/v3po2vpp.yang
@@ -79,4 +79,25 @@ module v3po2vpp {
         }
     }
 
+    identity interfaces-honeycomb-writer {
+        base config:module-type;
+        config:provided-service tapi:honeycomb-writer;
+    }
+
+    augment "/config:modules/config:module/config:configuration" {
+        case interfaces-honeycomb-writer {
+            when "/config:modules/config:module/config:type = 'interfaces-honeycomb-writer'";
+
+            container vpp-japi-ifc {
+                uses config:service-ref {
+                    refine type {
+                        mandatory true;
+                        config:required-identity vjc:vpp-japi;
+                    }
+                }
+            }
+
+        }
+    }
+
 }
\ No newline at end of file
diff --git a/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiCustomizer.java b/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiCustomizer.java
index de4602456..c9351cdc4 100644
--- a/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiCustomizer.java
+++ b/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiCustomizer.java
@@ -26,7 +26,7 @@ public abstract class VppApiCustomizer {
 
     private final org.openvpp.vppjapi.vppApi vppApi;
 
-    protected VppApiCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
+    public VppApiCustomizer(final org.openvpp.vppjapi.vppApi vppApi) {
         this.vppApi = vppApi;
     }
 
diff --git a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/VppApiInvocationException.java b/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiInvocationException.java
index 298c698f7..4c50304c6 100644
--- a/v3po/translate-api/src/main/java/io/fd/honeycomb/v3po/translate/VppApiInvocationException.java
+++ b/v3po/vpp-translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiInvocationException.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.fd.honeycomb.v3po.translate;
+package io.fd.honeycomb.v3po.translate.v3po.util;
 
 import com.google.common.annotations.Beta;
 import com.google.common.base.Preconditions;
@@ -24,7 +24,7 @@ import javax.annotation.Nonnull;
  * Thrown when Vpp jAPI method invocation failed.
  */
 @Beta
-public class VppApiInvocationException extends TranslationException {
+public class VppApiInvocationException extends Exception {
     private final String methodName;
     private final int ctxId;
     private final int errorCode;
@@ -73,4 +73,3 @@ public class VppApiInvocationException extends TranslationException {
         return errorCode;
     }
 }
-
diff --git a/v3po/translate-api/src/test/java/io/fd/honeycomb/v3po/translate/VppApiInvocationExceptionTest.java b/v3po/vpp-translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiInvocationExceptionTest.java
index b2cfbd216..184beceef 100644
--- a/v3po/translate-api/src/test/java/io/fd/honeycomb/v3po/translate/VppApiInvocationExceptionTest.java
+++ b/v3po/vpp-translate-utils/src/test/java/io/fd/honeycomb/v3po/translate/v3po/util/VppApiInvocationExceptionTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.fd.honeycomb.v3po.translate;
+package io.fd.honeycomb.v3po.translate.v3po.util;
 
 import java.util.Random;
 import org.junit.Assert;