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

Errata ID: 1185
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 4.9.5.1 says:

  Each group-
        specific set may contain (*,G), (S,G,rpt), and (S,G) source list
        entries in the Joined or Pruned lists.

     (*,G)
          The (*,G) source list entry is used in Join/Prune messages
          sent towards the RP for the specified group.  It expresses
          interest (or lack thereof) in receiving traffic sent to the
          group through the Rendezvous-Point shared tree.  There may
          only be one such entry in both the Joined and Pruned lists of
          a group-specific set.

          (*,G) source list entries have the Source-Address set to the
          address of the RP for group G, the Source-Address Mask-Len set
          to the full length of the IP address, and both the WC and RPT
          bits of the Encoded-Source-Address set.

     (S,G,rpt)
          The (S,G,rpt) source list entry is used in Join/Prune messages
          sent towards the RP for the specified group.  It expresses
          interest (or lack thereof) in receiving traffic through the
          shared tree sent by the specified source to this group.  For
          each source address, the entry may exist in only one of the
          Joined and Pruned source lists of a group-specific set, but
          not both.

          (S,G,rpt) source list entries have the Source-Address set to
          the address of the source S, the Source-Address Mask-Len set
          to the full length of the IP address, and the WC bit cleared
          and the RPT bit set in the Encoded-Source-Address.

     (S,G)
          The (S,G) source list entry is used in Join/Prune messages
          sent towards the specified source.  It expresses interest (or
          lack thereof) in receiving traffic through the shortest path
          tree sent by the source to the specified group.  For each
          source address, the entry may exist in only one of the Joined
          and Pruned source lists of a group-specific set, but not both.

It should say:

  Each group-
        specific set MAY contain (*,G), (S,G,rpt), and (S,G) source list
        entries in the Joined or Pruned lists.

     (*,G)
          The (*,G) source list entry is used in Join/Prune messages
          sent towards the RP for the specified group.  It expresses
          interest (or lack thereof) in receiving traffic sent to the
          group through the Rendezvous-Point shared tree.  There MUST 
          be one such entry in both the Joined and Pruned lists of
          a group-specific set.

          (*,G) source list entries have the Source-Address set to the
          address of the RP for group G, the Source-Address Mask-Len set
          to the full length of the IP address, and both the WC and RPT
          bits of the Encoded-Source-Address set.

     (S,G,rpt)
          The (S,G,rpt) source list entry is used in Join/Prune messages
          sent towards the RP for the specified group.  It expresses
          interest (or lack thereof) in receiving traffic through the
          shared tree sent by the specified source to this group.  For
          each source address, the entry MUST exist in only one of the
          Joined and Pruned source lists of a group-specific set, but
          not both.

          (S,G,rpt) source list entries have the Source-Address set to
          the address of the source S, the Source-Address Mask-Len set
          to the full length of the IP address, and the WC bit cleared
          and the RPT bit set in the Encoded-Source-Address.

     (S,G)
          The (S,G) source list entry is used in Join/Prune messages
          sent towards the specified source.  It expresses interest (or
          lack thereof) in receiving traffic through the shortest path
          tree sent by the source to the specified group.  For each
          source address, the entry MUST exist in only one of the Joined
          and Pruned source lists of a group-specific set, but not both.

Notes:

RFC 2119 keywords are not capitalized.

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