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Cisco Bug: CSCun90491 - VLAN BD change causes Traffic outage on 'untouched' VLAN IGMPV3 S entry

Last Modified

Jan 31, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(8)S4

Description (partial)

Symptom:
Traffic loss will be observed on IGMPV3 (G,S) entries for untouched VLAN's on F3 modules.

Conditions:
1) IGMP snooping enabled and working in IGMPv3 mode (and)
2) Delete of VLAN (and)
3) Deleted VLAN's HW_BD should be same as the mac table HW BD field value of any other VLAN's S entry.

Under the above conditions traffic loss on IGMPV3 (G,S) entries will be seen. The traffic loss is not applicable when IGMPV2 (G,*) entries are used. This issue happens very rarely because of condition 3.
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