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  • 1.  RPF Check on Join Message

    Posted 10-23-2013 13:07

    Hello Experts

     

    RPF check always perform on multicast source OR it also applies on join messages of receiver?

     

    Thanks



  • 2.  RE: RPF Check on Join Message

    Posted 10-23-2013 14:43

    PIM joins will only be sent upstream, if they have a valid RPF check to the upstream source, via that interface.



  • 3.  RE: RPF Check on Join Message

    Posted 10-23-2013 19:58

    Hello

     

    Thanks for the reply. Actually What I mean, when upstream router recieves the JOIN message, then does the upstream router will do the RPF check on that join message, means the join message received on valid shortest path to receiver?

     

    Thanks



  • 4.  RE: RPF Check on Join Message
    Best Answer

    Posted 10-23-2013 23:54
    Join doesn't contain info of receiver unicast address


  • 5.  RE: RPF Check on Join Message

    Posted 10-24-2013 18:17

    The only time the source address can be validated for multicast is using unicast RPF (uRPF) on a PIM registration request since register messages are unicast to the RP.  PIM join/prune and IGMP both send to a multicast address and thus can't be checked using uRPF.  

     

    Normal multicast RPF just confirms the data is coming in from the proper interface for the multicast source, it has no interaction with validating join requests.

     

    Does that help?

     

    -Chad