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Transmit V6 Neighbour advertisement on the receiving interface
This fix is IPV6 equivalent of https://review.opencontrail.org/#/c/11506/. In in-network service instance case, when service scaling is more than one, all the instances are going to have the same mac address and IP address. Inet route points to ECMP composite nexthop but FDB route does not point to ECMP nexthop. So when neighbour request is received from service VM Vrouter needs to send response on the incoming interface rather bridging the reply packet, as FDB route points to arbitrarly any of the service VM encap L2 nexthop. After preparing the reply packet,bridge lookup is done and outgoing interface is compared against ingress interface. If they are not same, reply packet is transmitted on ingress interface. Change-Id: Ib0113227019d7a452541129843813a647d388b36 closes-bug: #1461882
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