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: 1170
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 4.5.9 says:

+------------++--------------------------------------------------------+
|            ||                           Event                        |
|            ++--------------+--------------+-------------+------------+
|Prev State  || PruneDesired | PruneDesired | RPTJoin     | inherited_ |
|            || (S,G,rpt)    | (S,G,rpt)    | Desired(G)  | olist      |
|            || ->True       | ->False      | ->False     | (S,G,rpt)  |
|            ||              |              |             | ->non-NULL |
+------------++--------------+--------------+-------------+------------+
|RPTNotJoined|| -> P state   | -            | -           | -> NP state|
|(G) (NJ)    ||              |              |             |            |
+------------++--------------+--------------+-------------+------------+
|Pruned      || -            | -> NP state  | -> NJ state | -          |
|(S,G,rpt)   ||              | Send Join    |             |            |
|(P)         ||              | (S,G,rpt)    |             |            |
+------------++--------------+--------------+-------------+------------+
|NotPruned   || -> P state   | -            | -> NJ state | -          |
|(S,G,rpt)   || Send Prune   |              | Cancel OT   |            |
|(NP)        || (S,G,rpt);   |              |             |            |
|            || Cancel OT    |              |             |            |
+------------++--------------+--------------+-------------+------------+

Notes:

In the intersection of “RPTNotJoined(G)” and “PruneDesired(S,G,rpt) -> True”, the state table indicates that the result is to move into “Pruned(S,G,rpt)” state. This occurs again in the text on pages 80 and 81. Why would join state be entered for (*,G) simply in order to prune (S,G,rpt)?

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