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diff --git a/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/SubInterfaceRoutingValidator.java b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/SubInterfaceRoutingValidator.java
new file mode 100644
index 000000000..e769409bd
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+++ b/v3po/v3po2vpp/src/main/java/io/fd/hc2vpp/v3po/write/SubInterfaceRoutingValidator.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2019 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.hc2vpp.v3po.write;
+
+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.vpp.vlan.rev180319.interfaces._interface.sub.interfaces.SubInterface;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.ip4.attributes.Ipv4;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.ip6.attributes.Ipv6;
+import org.opendaylight.yang.gen.v1.http.fd.io.hc2vpp.yang.vpp.vlan.rev180319.sub._interface.routing.attributes.Routing;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class SubInterfaceRoutingValidator implements Validator<Routing> {
+
+ public SubInterfaceRoutingValidator(@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 {
+ 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 {
+ 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 {
+ checkInterfaceAddressConf(id, writeContext, false);
+ } catch (Exception e) {
+ throw new DeleteValidationFailedException(id, e);
+ }
+ }
+
+ private void checkInterfaceAddressConf(@Nonnull final InstanceIdentifier<Routing> id,
+ @Nonnull final WriteContext ctx,
+ boolean checkBefore) {
+ checkState(isAddressNotPresentForSubInterface(id, ctx, checkBefore),
+ "Cannot change routing configuration, if address is present for sub-interface");
+ }
+
+ /**
+ * Returns true if interface does not have v4/v6 addresses configured
+ */
+ private boolean isAddressNotPresentForSubInterface(@Nonnull final InstanceIdentifier<Routing> id,
+ @Nonnull final WriteContext ctx,
+ boolean checkBefore) {
+ final Optional<SubInterface> subInterfaceData = checkBefore
+ ?
+ ctx.readBefore(RWUtils.cutId(id, SubInterface.class))
+ :
+ ctx.readAfter(RWUtils.cutId(id, SubInterface.class));
+
+ if (subInterfaceData.isPresent()) {
+ final SubInterface subInterface = subInterfaceData.get();
+
+ final boolean v4NotPresent =
+ java.util.Optional.ofNullable(subInterface.getIpv4()).map(Ipv4::getAddress).map(List::isEmpty)
+ .orElse(true);
+
+ final boolean v6NotPresent =
+ java.util.Optional.ofNullable(subInterface.getIpv6()).map(Ipv6::getAddress).map(List::isEmpty)
+ .orElse(true);
+ return v4NotPresent && v6NotPresent;
+ }
+ return true;
+ }
+}