we have this AP AIR 2802E working as ME(controller), its firmware is 22.214.171.124 and backup firmware is 126.96.36.199
But a few AP (2802E) can be upgraded and is working, other APs(AIR2802) cannot be upgraded, so cannot join to ME (controller)
2802AP which is not joining to ME controller are runing which version of software ?
Mkae sure you have the smae image on all APs.
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AIR 2802 ME controller primary is 8.6.101 and Backup is 8.8.120
Already checked APs firmware, the primary is 8.6.101 and backup is 8.8.120 its work
but the other APs cannot upgrade from the ME(controller) still (primary is 8.6.101and secondary is 8.3.143)
I got it...but as i asked in my first...
which software version you are having on 2802AP(Fialed to join APs) which are not joing to WLC.
please make sure all APs have same version as controller. If this is not true, please downgrade the controller (higher version has issues with sync), and then when all APs connect, upgrade WLC back.
If all have same version, make sure only one AP is controller, and ME capable. Sometimes happens that there are 2-3 WLC with same priority and APs are not connecting to right one.
If this is not problem, check DHCP settings. All APs should be in same subnet, check router if you have ip address helper configured on your interface. Make sure your WLC has static address, and others APs have DHCP.
If this is not problem, switch off interfaces on switch where are others AP connected, and them switch on each interface one by one.
I hope you will make it