N+1 redundancy in 5520 faiover

[csco10979295]

we are trying to form N+1 redundancy 

 50 remote sites and one DC 

remotes site has 5520 and DC has 5520 

1) when remote site wlc failed , so AP needs to communicate to DC and make the connectivity . 

also do i need - HA SKU license for it ?

[Flavio Miranda]

Hi You don't. HA SKU apply if you were using HA SSO. For N + 1 HA you need to regular WLC.

[csco10979295]

Thank you . Do i need to create mobility group for all ?

[Scott Fella]

There is no HA sku for the 5520.  You should always have mobility configured when you have an N+1 design. This allows for client roaming and other things to work. 

[csco10979295]

Thank you . 

how we achieved . just include the backup WLC ip address in wireless controller backup and Access point secondary WLC update. 

working no issue on it .