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

Note: This RFC has been obsoleted by RFC 7761

Errata ID: 1154
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 4.5.1 says:

   The transition events "Receive Join(*,*,RP)" and "Receive
   Prune(*,*,RP)" imply receiving a Join or Prune targeted to this
   router's primary IP address on the received interface.  If the
   upstream neighbor address field is not correct, these state
   transitions in this state machine must not occur, although seeing
   such a packet may cause state transitions in other state machines.

   On unnumbered interfaces on point-to-point links, the router's
   address should be the same as the source address it chose for the
   Hello message it sent over that interface.  However, on point-to-
   point links we also recommend that for backwards compatibility

It should say:

   The transition events "Receive Join(*,*,RP)" and "Receive
   Prune(*,*,RP)" imply receiving a Join or Prune targeted to this
   router's primary IP address on the received interface.  If the
   upstream neighbor address field is not correct, these state
   transitions in this state machine MUST NOT occur, although seeing
   such a packet MAY cause state transitions in other state machines.

   On unnumbered interfaces on point-to-point links, the router's
   address should be the same as the source address it chose for the
   Hello message it sent over that interface.  However, on point-to-
   point links it is also RECOMMENDED that for backwards compatibility

Notes:

RFC 2119 keywords are not capitalized.

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