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Port-channel is in discarding state for a newly added Vlan

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TitlePort-channel is in discarding state for a newly added Vlan
Symptoms
Port-channel is in Spanning Tree discarding state for a newly added vlan
Environment
NOS 
VDX
Cause
The issue is because of the DEFECT000635844
When STP is enabled on a PO interfaces, it is enabled only for vports and not for main physical/po interfaces for PVST/RPVST.
In this scenario whenever a RBridge leaves cluster,  STP module runs State Machine to re compute the topology and it can hit the issue.
Resolution
Please upgrade the devices to the below codes where the DEFECT is fixed

NOS6.0.2e, NOS7.0.1c, NOS7.1.0a, NOS7.2.0
Additional notes

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