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Cisco Bug: CSCur21818 - F3:Transient l2mcast/otv traffic drop during ISSU from 6.2.6/8 to 6.2.10

Last Modified

Oct 16, 2014

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(10)S94

Description (partial) 

Symptom:
Multicast traffic drop during ISSU for a small window of time in F3 modules for the following traffic cases
-  IGMPv3 L2 multicast traffic on CE/DCE VLAN
-  IGMPv3 L2 multicast traffic with Layer 3 routing from one SVI to another SVI 
-  OTV L2 multicast traffic with IGMPv3

Note: Traffic using IGMPv3 entries will encounter this issue. Traffic using IGMPv2 entries will not encounter this issue.

Conditions:
1) IGMP snooping enabled and working in IGMPv3 mode (and)
2) ISSU from 6.2.6 (or) 6.2.8 to 6.2.10
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