How to configure HA between local controller and remote controller in DC

Question

Good day,
If I have two Cisco 5508 Controllers, running Software version 7.4, how would my failover happen when the AP's run in local mode, and the local controller fail, and you configured your remote controller as your secondary controller.  Question is, will the APs automatically convert to FlexConnect mode when they failover to the remote controller in the DC?  I know you cannot configure HA as the controllers have to be connected with ethernet copper cable on the redundancy port, giving you a distance limitation of 100m.
Thank you in advance
Adrian

Answer 1

Hello ,
As per your query i can suggest you the following solution-
In wireless network deployments that run controller versions earlier than 5.0, when a controller goes down, it takes a long time for all the APs and the associated clients to move to a backup controller and for wireless service to resume.
The features discussed in the document are implemented on the controller CLI in WLC software release 5.0 in order to decrease the time that it takes for access points and their associated clients to move to a backup controller and for wireless service to resume after a controller goes down:
In order to reduce the controller failure detection time, you can configure the heartbeat interval between the controller and access point with a smaller timeout value.
In addition to the option to configure primary, secondary, and tertiary controllers for a specific access point, you can now also configure primary and secondary backup controllers for a specific controller. If the local controller of the access point fails, it chooses an available controller from the backup controller list in this order:
•o primary
•o secondary
•o tertiary
•o primary backup
•o secondary backup
The access point maintains a list of backup controllers and periodically sends primary discovery requests to each entry on the list. You can now configure a primary discovery request timer in order to specify the amount of time that a controller has to respond to the discovery request of the access point before the access point assumes that the controller cannot be joined and waits for a discovery response from the next controller in the list.
Hope this will help you.