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AP cannot register to backup controller on XCA when option 78 is used and backup controller is in a different vlan to the primary controller

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TitleAP cannot register to backup controller on XCA when option 78 is used and backup controller is in a different vlan to the primary controller
Symptoms
AP can't register to backup controller on XCA when option 78 is used and backup controller is in a different vlan to the primary controller.  Following message maybe seen on backup controller
 
Info        RU Manager                      Wireless AP connects for discovery. Ignoring discovery request from foreign AP[9999Y-9999900000], passing the AP to the peer
Info        RU Manager                      Wireless AP connects for discovery. Serial Number: 9999Y-9999900000

 
Environment
  • eXtreme Cloud Appliance
  • XCA
  • 4.56.01
  • Option 78
Cause
The backup controller and AP's are in vlan X, the primary controller is in vlan Y, option 78 has been configured to return, in order, the IP's of the controllers: primary, secondary.  Because the primary controller cannot see the layer 2 SLP multicasts in vlan X causes the above message to be displayed.


 
Resolution
Options to resolve are:
  • Place both controllers AP registration interface in the same vlan as each other.
  • Return only the primary IP address in option 78 data
  • Use an alternate discovery method that doesn't involve multicast such as DNS or DHCP option 43
Additional notes

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