General

Symptom: Traffic loss due to a (S,G) route having wrong RPF interface ((S,G) will have the RPF interface of a (*,G) route). Conditions: If the following two events happen on a router almost at the same time: - a PIM (S,G,RP-bit)-Assert or a (S,G,RP-bit)-Prune is received by the router - Multicast data-packet for that (S,G) is leaked to Supervisor OR MSDP (S,G) route is learnt by the router Then, the (S,G) route can get to a state where its RPF-interface/neighbor is the same as that of the (*,G) route. If the RPF-interface/neighbor for the Source S should be different from that of the (*,G), as determined by the unicast routing, then this results in traffic not received from the source S, and no forwarding happens on the (S,G).