RFC 4601, "Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)", August 2006
Note: This RFC has been obsoleted by RFC 7761Source of RFC: pim (rtg)
Errata ID: 1113
Status: Held for Document Update
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with a new GenID is received from a neighbor, any old Hello information about that neighbor SHOULD be discarded and superseded by the information from the new Hello message.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.
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.