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Access Points are not forming backup tunnel in HA pair

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Information

 
TitleAccess Points are not forming backup tunnel in HA pair
Symptoms
  • Some APs are not forming backup tunnel in HA pair
  • WLAN services fail to sync
Environment
  • IdentiFi Wireless
  • V2110
  • High Availability (HA) / Failover 
  • Firmware 9.21.x, 10.x
  • VMware
Cause
The tunnel between AP and secondary controller may not establish if the secondary controller does not meet the AP capacity of the primary controller. This may be due to a misconfiguration of the VMware CPU and RAM settings which determine the size (small / medium / large) of an elastic controller. Synchronization between controllers may also fail in this scenario.
 
Resolution
Make sure both controllers are configured as the same size (small / medium / large).
Additional notes
For information about installation size and requirements of a V2110 please refer to article What are the host resource requirements for each tier of an elastic controller

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