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RFC 4601, "Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)", August 2006

Note: This RFC has been obsoleted by RFC 7761

Note: This RFC has been updated by RFC 5059, RFC 5796, RFC 6226

Source of RFC: pim (rtg)

Errata ID: 1167
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT

Reported By: Maren Peasley
Date Reported: 2007-12-21
Held for Document Update by: David Ward
Date Held: 2009-03-22

Section 4.5.7 says:

          The upstream (S,G) state machine remains in Joined state.
          Send Join(S,G) to the new upstream neighbor, which is the new
          value of RPF'(S,G).  Send Prune(S,G) to the old upstream
          neighbor, which is the old value of RPF'(S,G).  Set the Join
          Timer (JT) to expire after t_periodic seconds.


Sending the Prune(*,G) may help state issues, but if the change in MRIB was spurious or there was a situation where a difference of opinion in lower route costs exists, some traffic may be dropped until the MRIB becomes consistent again.

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