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Multicasting via VSB stopped after partial VSB down

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TitleMulticasting via VSB stopped after partial VSB down
Symptoms
Multicast traffic (L2) may stop on VLANs after one of the chassis in VSB is power cycled.
Environment
Platform: S-series, VSB
Firmware: 8.32.01.00.21
Cause
Hardware entries for IGMP may be misprogrammed.
This appears mostly on LAGs with symmetrical ports and same type of blade in each chassis, e.g. lag.0.x had tg.4.4 and tg.8.4 as members, one blade in each S4 chassis, and identical blade type.
Resolution
Upgrade to firmware 8.42.05 or higher
Additional notes

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