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Cisco Bug: CSCvv21398 - sdwan multicast cEdge rpf failure even with unicast route present in rib and omp

Last Modified

Sep 30, 2020

Products (1)

  • Cisco XE SD-WAN Routers

Known Affected Releases

17.2.1r Amsterdam-17.2.1r

Description (partial)

Symptom:
In SDWAN Multicast setup we see the remote edges recognize the replicator and also sees the unicast route to the RP but RPF check fails for the RP address. Even though the replicator is identified at the remote edge, we don't receive any Joins/Prunes on the overlay.

Even though the route to the RP is present in RIB, we don't see any omp multicast routes populate as well as the RPF check fails.

Please check the screenshots in the enclosures.

Topology: CSR(RP) -- cEdge (Replicator) ---MPLS/Internet --- cEdge (Reciever site) -- CSR (Reciever)

This issue doesn't seem to be hardware specific and has been seen on ISR 4451-X in addition to CSR

Conditions:
Current Setup in Place with vManage 20.1.1
cedge 17.2.1v as well as seen on 17.2.1r
If there is a loopback interface configured on the cEdge with the same IP address as the SD-WAN system-ip, the issue will occur.
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