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Cisco Bug: CSCun02437 - When multicast packet send to nexus 3k they punt to CPU after delay

Last Modified

May 20, 2020

Products (1)

  • Cisco Nexus 3000 Series Switches

Known Affected Releases

7.1(0)ZD(1)

Description (partial)

Symptom:
S,G entry appears after the delay of varying from 5-20 minutes .  Once S,G entry will be there it will stays forever

Conditions:
1)      you have MANY SOURCES that send traffic all on the SAME GROUP

2)      the sources are all on the SAME VLAN and traffic enters the switch from an L2 access port or trunk(SVI RPF interface)    -- does not in the case of routed ports or Pos

3)      there is a local receiver on the same vlan of the senders and that receiver joins BEFORE the sources.
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