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VOSS: LACP Shows a Churn Condition Error and Connectivity Fails to an EXOS Switch on the Far End

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Information

 
TitleVOSS: LACP Shows a Churn Condition Error and Connectivity Fails to an EXOS Switch on the Far End
Symptoms
  • VSP switch is connected to an EXOS X460-G2
  • Switch is logging below messages repeatedly
1 2020-04-10T16:17:24.583-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d1 - 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/47 as the  PARTNER is out of sync.
1 2020-04-10T16:20:20.283-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d2 - 00000000 GlobalRouter LACP INFO A churn condition has been resolved for port 1/47 as the Actor and Partner are in sync.
1 2020-04-10T16:22:21.403-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d1 - 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/47 as the  PARTNER is out of sync.
1 2020-04-10T16:27:24.923-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d2 - 00000000 GlobalRouter LACP INFO A churn condition has been resolved for port 1/47 as the Actor and Partner are in sync.
1 2020-04-10T16:36:29.466-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d1 - 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/44 as the  PARTNER is out of sync.
1 2020-04-10T16:36:30.108-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d2 - 00000000 GlobalRouter LACP INFO A churn condition has been resolved for port 1/44 as the Actor and Partner are in sync.
1 2020-04-10T16:40:58.350-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d1 - 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/47 as the  PARTNER is out of sync.
1 2020-04-10T16:42:52.184-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d2 - 00000000 GlobalRouter LACP INFO A churn condition has been resolved for port 1/47 as the Actor and Partner are in sync.
1 2020-04-10T16:44:53.123-04:00 VSP-7400-48Y-8C CP1 - 0x000ec5d1 - 00000000 GlobalRouter LACP INFO A churn condition has been detected for port 1/47 as the  PARTNER is out of sync.
  • Not learning any MAC on the affected ports.
  • HAL process on X460-G2 switch staying around 40% util and above.
Environment
  • All VOSS platforms
  • EXOS X460
  • All supported releases
Cause
  • MAC movement detected on the EXOS X460-G2 switch between two ports which was causing the high HAL process on X460 resulting in LACP churns on VSP.
Resolution
  • Fix the MAC movement issue or disable the ports where MAC movement is detected
Additional notes
  • To detect MAC movement on EXOS below command can be run
configure fdb mac-tracking add ports <port_list>

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