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Cisco Bug: CSCvi74405 - Ports on Sup2T based 6ks or 6880 switches may remain down after software upgrade

Last Modified

Jun 22, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.2(1)SY6.1 15.5(1)IA1.628 15.5(1)IA1.636

Description (partial)

Symptom:
6880s or Sup2t based 6500 or 6800s may have some ports fail to link up after a software upgrade. If configured as a VSS, this may also impact the VSLs, causing the system go to into a split-brain scenario or run with a lower VSL capacity.

Conditions:
First seen on 6880s upgraded to 15.2(1)SY6 with various transceivers. No known configurations are necessary to trigger this issue.
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