ICMPv6 RA messages looping if transparent SI + ECMP

[amit surana]

v6 service-chain with 3 transparent SIs in ECMP is configured. It is seen that ICMPv6 RA messages sent by vRouter are continuously looping and hogging network b/w and host CPU.

[Hari Prasad Killi (haripk)]

Here is our observation in a local setup:
Agent sends RA messages to all interfaces having v6, including the transparent SI. The RA message sent to the transparent SI reaches the other end VM resulting in multiple RA messages on the VMs. Agent need not send RA to the transparent SI interfaces to avoid this problem. This however wasnt resulting in a storm and the original issue needs to be recreated and checked.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/20739
Submitter: RAVI KIRAN (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/20739
Committed: http://github.org/Juniper/contrail-controller/commit/0eb0eda8424ae4412fd357490f07cf08efe01b38
Submitter: Zuul
Branch: R3.0

commit 0eb0eda8424ae4412fd357490f07cf08efe01b38
Author: Ravi BK <email address hidden>
Date: Sat May 28 23:43:32 2016 +0530

Issue: RAs sent incorrectly if transperant SI exist

Root-cause & fix: Multiple router advertisements are seen on VMs if
there exists a transperant Service-Instance. This is due to transperant
forwarding of Router advertisements from left-interface to right-interface
of transperant SI. It is not required to send RAs to left and right
interfaces of SI so that current issue can be avoided.

Change-Id: If554f2eac6fb6d7035cb4b75fa0327d695ffdfe6
Closes-bug: #1584995

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/20748
Submitter: RAVI KIRAN (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/20748
Committed: http://github.org/Juniper/contrail-controller/commit/9af58f78e0d4969c50cb96295b2ee29e09cf8b58
Submitter: Zuul
Branch: master

commit 9af58f78e0d4969c50cb96295b2ee29e09cf8b58
Author: Ravi BK <email address hidden>
Date: Mon May 30 08:36:20 2016 +0530

Issue: RA sent incorrectly if transparent SI exist.

Fix: Porting the fix to mainline branch.

Change-Id: If7689ac366035c4a392e48ad589706cee501eca2
Closes-bug: #1584995