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Clear pim join and effects on Transit multicast stream

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  • 1.  Clear pim join and effects on Transit multicast stream

    Posted 10-18-2018 22:17

     Please consider the following example:

     

    Listener-------f1 SRX---f2---------------Rest of Multicast Network--SRC 1.1.1.1

    235.1.1.1

    DENSE MODE CASE:

    Suppose  SRC is generating packet every 2 msec for group 235.1.1.1

    If we isse  "clear pim join "   on SRX, to flush multicast cache ( that can be seen as show multicast route), will it cause SRX to drop ( 1.1.1.1,235.1.1.1) packet?

     

    Will same be true for SPARSE MODE as well?

     

     

    Thanks and have a nice weekend!!

     



  • 2.  RE: Clear pim join and effects on Transit multicast stream
    Best Answer

     
    Posted 10-19-2018 02:54

    when there is no active group members, system would send prune msg upstream to its neighbor. clearing those joins shouldn't ideally affect. The command is not only "clear pim join" but its as follows:

     

    > clear pim join ?  
    Possible completions:
      <group>              IP address and optional prefix length of group
      all                  Clear all PIM join/prune states
      bidirectional        Clear only bidirectional PIM entries
      dense                Clear only PIM dense-mode entries
      exact                Clear only group that matches exactly
      inet                 Clear IPv4 join/prune state
      inet6                Clear IPv6 join/prune state
      instance             Name of instance
      logical-system       Name of logical system, or 'all'
      rp                   IP address and optional prefix length of rendezvous point
      sg                   Clear only S,G entries
      source               IP address and optional prefix length of source
      sparse               Clear only PIM sparse-mode entries (including SSM)
      star-g               Clear only *,G entries

    So clear the group that is inactive, not all to be safe.

    Can be used for spare mode as well followed group address.