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Cisco Bug: CSCvs54872 - N7K SVI down (VLAN/BD is down) while there are active ports in vlan due to incorrect FLC counter

Last Modified

Mar 03, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.3(2)D1(2) 7.3(5)D1(1)

Description (partial)

With specific conditions FLC-counter ("sh spanning-tree internal flc-info") for the vlan may become lower, than actual count of active ports in that vlan. As a consequence, it reaches zero even so there are still active forwarding port available for the vlan, causing autostate-enabled SVIs to go down.

Conditions, when the issue was observed:
- primary-leg of the vPC-enabled Port-channel is  (suspended by vpc)
- during that time, secondary-leg of that vPC-enabled port-channel goes down
- primary-leg comes up, but FLC-counter is not increased
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