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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

Source of RFC: pim (rtg)

Errata ID: 1113
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 4.3.1/6.1.1 says: 

   The Generation_Identifier (GenID) Option SHOULD be included in all
   Hello messages.  The GenID option contains a randomly generated
   32-bit value that is regenerated each time PIM forwarding is started
   or restarted on the interface, including when the router itself
   restarts.  When a Hello message with a new GenID is received from a
   neighbor, any old Hello information about that neighbor SHOULD be
   discarded and superseded by the information from the new Hello
   message.  This may cause a new DR to be chosen on that interface.

Notes:

Section 6.1.1, item 2 only considers the possibility of falsified Designated Router election results, it does not consider state thrash due to falsified Hello messages with new Generation_Identifier Options.

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