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Cisco Bug: CSCvu45990 - L2 Multicast with IGMP Snooping fails when using IGMPv2 Querier and egress interface is Bundle

Last Modified

Sep 02, 2020

Products (1)

  • Cisco Network Convergence System 5500 Series

Known Affected Releases


Description (partial)

In IGMPv2 querier scenario and if NCS egress interface is bundle then:
1. no IGMP reports are sent out by NCS upstream (although snooped from host/receiver). 
2. no IGMP group entry is created on IGMP querier router, i.e. no mcast traffic is forwarded downstream.

Seen with NCS configured for L2 Multicast with IGMP Snooping scenario when:
1. IGMP Querier is using version 2;
2. egress interface is Bundle.
Source --> L3/MCAST router running IGMPv2 -->  NCS doing L2 Multicast with IGMP Snooping [BE] --> Host/Receiver
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