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Cisco Bug: CSCvv63523 - VPC peerlink Port-channel goes down when upgraded to 7.0(3)I7(8) with lacp system-prorioty

Last Modified

Sep 23, 2020

Products (1)

  • Cisco Nexus 3000 Series Switches

Known Affected Releases

7.0(3)I7(8)

Description (partial)

Symptom:
- Once the switches are upgraded to 7.0(3)I7(8), "lacp system-mac 0000.0000.0800 role secondary" is automatically added to the configuration on both switches.
- Then both switches will have same lacp system-identifier values and the VPC peerlink Port-channel between these switches won't be coming up and will put interfaces in suspended state.
- We will not be able to change the lacp system-priority value, and lacp system-mac command can not be removed/changed.

lacp system-priority 24576
lacp system-mac 0000.0000.0800 role secondary


show lacp system-identifier 
24576,0-0-40-1b-8-0  <<<------- lacp system-priority is 24576
sa-ontor8-01-10(config)# lacp system-priority 32768 <<<<<----------- change it to 32768
sa-ontor8-01-10(config)# show lacp system-identifier 
24576,0-0-40-1b-8-0 <<<<<<---- no effect

sa-ontor8-01-10(config)# no lacp system-mac 0000.0000.0800 role secondary
ERROR: Unknown/Invalid config command ID 4

Conditions:
- N3K-3048 Switches running 7.0(3)I4(8) and "lacp system-priority" configured with same value on both VPC peer switches.
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