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Traffic loss for a short period of time while rebooting one of the switch in a single tier MLAG setup

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TitleTraffic loss for a short period of time while rebooting one of the switch in a single tier MLAG setup
Symptoms
<Erro:HAL.VSM.InstlHwFiltFail> Slot-1: Filter hardware install failed on slot 1, unit 0 return code 4294967292
<Erro:HAL.VSM.InstlHwFiltFail> Slot-1: Filter hardware install failed on slot 1, unit 0 return code 4294967283

The above logs can be seen when any of the MLAG port goes down or comes up. 
MLAGpeer1 
MLAGpeer2

If the error messages are seen in peer1 and if you disable the local MLAG port on peer1 and try to reach the client via ISC the traffic will be sent via ISC and the peer2 will not pass the traffic via its local MLAG port to the client.
Environment
EXOS All

 
Cause
This is a software bug which can be triggered when enabling MLAG on a port which is in NP (not-present) state.
This issue can also get triggered after multiple fail-overs and stack reboots
Resolution
possible workaround, disable MLAG on ports which are in NP state.
or disable MLAG on all the ports and re-enabled only on the ports which are in ready/active state.

If MLAG is not enabled on any of the ports which are in not present state then the issue could have been triggered by reboot/failover and need to upgrade the software where the CR xos0075939 is fixed.

Expected fix
EXOS 30.3.1
EXOS Later to 22.5.1 patch 1-9
EXOS 22.7.1-GA-Aug19

please note that all mentioned release are subjected to change, please go through the release notes prior to upgrade.

 
Additional notes

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