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Cisco Bug: CSCus75034 - Nexus 3500 - Flexlink Mcast Fast Convergence - no IGMP report leak

Last Modified

Feb 28, 2017

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases

6.0(2)A3(2.68) 6.0(2)A4(3)

Description (partial)

Symptom:
No IGMP reports are leaked over Backup Standby Port in Flexlink configuration when Mcast fast convergence is configured.

No IGMP snooping entry is created on the upstream switch for the port connecting to the Backup port on the N3500 side.
This would lead to high Mcast convergence when Active Port goes down and Standby port becomes active as upstream switch would not be forwarding multicast traffic for the hosts connected on the N3500.

Conditions:
Flexlink configuration with Mcast Fast convergence configured:

switchport backup interface <> multicast fast-convergence

The upstream switch connecting to the backup port does not receive any IGMP reports for the hosts/receivers connected across N3500 switch.
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