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Cisco Bug: CSCvv26464 - N9k - IGMP report destined to 224.0.0.x sent back on same port it is received on

Last Modified

Oct 09, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(4) 9.3(5)

Description (partial)

Symptom:
MAC flaps on downstream switches connected behind Cisco Nexus switches, intermittent connectivity issues.
Traffic is reflected back on same interface it was received on
Duplicate IGMP reports seen in the VLAN.

Conditions:
N9k with network receiving IGMP membership report destined to 224.0.0.x reserved for Link local multicast.
SVI (L3 interface-vlan) enabled
VXLAN Fabric (no TRM)
IGMP snooping disabled for VLAN/VNI which is the default setting for non TRM environment
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  • Status
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