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Cisco Bug: CSCsy96184 - PIM should not reject assert with all zero source if RPT bit is set

Last Modified

Jan 29, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(44)SE

Description (partial)

Symptom:
can result in dup packets on segment when mcast topo changes in multi-vendor environment.

"debug ip pim" will show 
PIM(0): Received v2 Assert on Vlan1 from 192.168.1.1
PIM(0): Invalid host address 0.0.0.0

Conditions:

When another router sends PIM assert with source address 0.0.0.0 and RPT bit set, PIM will reject it as an invalid source. Only happens when forwarding on shared tree as this is the only time per RFC 4601 when assert with source address 0.0.0.0 is valid.
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