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Cisco Bug: CSCvt31437 - DAD links go into err-disable due to portfast bpduguard global config when both members reload

Last Modified

Sep 10, 2020

Products (1)

  • Cisco Catalyst 9500 Series Switches

Known Affected Releases

16.11.1 16.12.2 16.9.4 16.9.5 17.3.1

Description (partial)

Symptom:
DAD links on a stackwise virtual pair are put into err-disable due to "spanning-tree portfast bpduguard" default configuration.

Conditions:
Following global configurations (or equivalent) are present:

spanning-tree portfast bpduguard default
spanning-tree portfast default

This can happen upon reload of any member of a stackwise virtual setup.

This is a day 1 issue which can potentially affect any Cat9K platform running stackwise virtual setup.
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