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S-Series, K-Series, Securestack and N-series Displays LAG Information From Disconnected Switch

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TitleS-Series, K-Series, Securestack and N-series Displays LAG Information From Disconnected Switch
Symptoms
  • Configure dynamic lag between a Securestack and another switch
  • Disconnect switch to which LAG formed
  • Connect B5-Series to another switch that does not have lacp running on ports
  • show port lacp port ge.x.y status summary shows information from previously connected LACP partner 
    • (su)->show port lacp port ge.1.1 status summary
    • Global Link Aggregation state : Enabled
      Port Aggr Actor System Partner System Pri: System ID: Key: Pri: System ID:  Key:
      ge.1.1  lag.0.1  [(32768,00:11:88:A7:A1:24,32768), (32768,00:11:88:16:8C:51,32768)]
Environment
  • S-Series
  • K-Series
  • Securestack
  • N-Series
Cause
  • The switch persistently stores the LAG_ID (built from the actor/partner MAC+Key) bindings and uses them to restore dynamic LAGs after a system reboot.
  • If the system reaches a point where it needs to build a new aggregation and there is no matching "historical" binding and no available "clear" Aggregator, it will reuse one of the available "historical" Aggregators.
Resolution
The switch is functioning as designed, so no action is required.
Additional notes
Cannot clear information about previously learned connected partners - only resolution is a power cycle.

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