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diff --git a/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/InterfaceRoutingValidator.java b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/InterfaceRoutingValidator.java
new file mode 100644
index 000000000..608bda3fa
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/InterfaceRoutingValidator.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2019 PANTHEON.tech.
+ *
+ * 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.hc2vpp.v3po.write;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import io.fd.hc2vpp.common.translate.util.NamingContext;
+import io.fd.honeycomb.translate.util.RWUtils;
+import io.fd.honeycomb.translate.write.DataValidationFailedException.CreateValidationFailedException;
+import io.fd.honeycomb.translate.write.DataValidationFailedException.DeleteValidationFailedException;
+import io.fd.honeycomb.translate.write.DataValidationFailedException.UpdateValidationFailedException;
+import io.fd.honeycomb.translate.write.Validator;
+import io.fd.honeycomb.translate.write.WriteContext;
+import java.util.List;
+import java.util.Optional;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.v3po.rev190502.RoutingBaseAttributes;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.v3po.rev190502.interfaces._interface.Routing;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev180220.interfaces.Interface;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev180222.Interface1;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev180222.interfaces._interface.Ipv4;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev180222.interfaces._interface.Ipv6;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class InterfaceRoutingValidator implements Validator<Routing> {
+
+ public InterfaceRoutingValidator(@Nonnull final NamingContext interfaceContext) {
+ checkNotNull(interfaceContext, "interfaceContext should not be null");
+ }
+
+ @Override
+ public void validateWrite(@Nonnull final InstanceIdentifier<Routing> id, @Nonnull final Routing dataAfter,
+ @Nonnull final WriteContext writeContext)
+ throws CreateValidationFailedException {
+ try {
+ checkVrfIds(dataAfter);
+ checkInterfaceAddressConf(id, writeContext, true);
+ } catch (Exception e) {
+ throw new CreateValidationFailedException(id, dataAfter, e);
+ }
+ }
+
+ @Override
+ public void validateUpdate(@Nonnull final InstanceIdentifier<Routing> id, @Nonnull final Routing dataBefore,
+ @Nonnull final Routing dataAfter, @Nonnull final WriteContext writeContext)
+ throws UpdateValidationFailedException {
+ try {
+ checkVrfIds(dataAfter);
+ checkInterfaceAddressConf(id, writeContext, true);
+ } catch (Exception e) {
+ throw new UpdateValidationFailedException(id, dataBefore, dataAfter, e);
+ }
+ }
+
+ @Override
+ public void validateDelete(@Nonnull final InstanceIdentifier<Routing> id, @Nonnull final Routing dataBefore,
+ @Nonnull final WriteContext writeContext)
+ throws DeleteValidationFailedException {
+ try {
+ checkVrfIds(dataBefore);
+ checkInterfaceAddressConf(id, writeContext, false);
+ } catch (Exception e) {
+ throw new DeleteValidationFailedException(id, e);
+ }
+ }
+
+ private void checkVrfIds(final RoutingBaseAttributes data) {
+ checkArgument(data.getIpv4VrfId() != null || data.getIpv6VrfId() != null, "No vrf-id given");
+ }
+
+ private void checkInterfaceAddressConf(@Nonnull final InstanceIdentifier<Routing> id,
+ @Nonnull final WriteContext ctx,
+ boolean checkBefore) {
+ checkState(isAddressNotPresentForInterface(id, ctx, checkBefore),
+ "Cannot change routing configuration, if address is present for interface");
+ }
+
+ /**
+ * Returns true if interface does not have v4/v6 addresses configured
+ */
+ private boolean isAddressNotPresentForInterface(@Nonnull final InstanceIdentifier<Routing> id,
+ @Nonnull final WriteContext ctx,
+ boolean checkBefore) {
+ final Optional<Interface> interfaceData = checkBefore
+ ? ctx.readBefore(RWUtils.cutId(id, Interface.class))
+ : ctx.readAfter(RWUtils.cutId(id, Interface.class));
+
+ if (interfaceData.isPresent()) {
+ final java.util.Optional<Interface1> augData = java.util.Optional.of(interfaceData.get())
+ .map(iface -> iface.augmentation(Interface1.class));
+
+ final boolean v4NotPresent =
+ augData.map(Interface1::getIpv4).map(Ipv4::getAddress).map(List::isEmpty).orElse(true);
+
+ final boolean v6NotPresent =
+ augData.map(Interface1::getIpv6).map(Ipv6::getAddress).map(List::isEmpty).orElse(true);
+
+ return v4NotPresent && v6NotPresent;
+ }
+ return true;
+ }
+}