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Why are some AP's showing up offline vs some online on the virtual controller?

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TitleWhy are some AP's showing up offline vs some online on the virtual controller?
Symptoms
Some APs are showing up online and some offline on the virtual controller. 
Environment
  • AP75XX
  • AP65XX
  • WiNG ENTERPRISE
Cause
Two or more Virtual Controllers are configured in the same broadcast domain. APs are adopting to multiple Virtual controllers.
Resolution
Connect to Command Line Interface of an Online AP via Putty.exe using SSH (Secure Shell) and run the following commands:
 
en
show adoption status

This will indicate the Virtual Controller to which the AP is adopted. Repeat with an Offline AP. Decide which of the APs you'd like to keep as the Virtual Controller and run these commands to disable the setting on the others:
 
en
self
no virtual-controller
com wr

Reboot the APs. 

On the Virtual controller check to make sure all APs are adopted and configured:
 
en
show adoption status
show wireless ap

 
Additional notes
It is recommended that only one Virtual Controller per broadcast domain be configured. Any other setup is not supported. 

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