--> There are basically four cisco wireless lan controller high availability models available.
1) High Availability Pairing
--> Two wireless controllers will be acting as active/standby.
--> Active and Standby wireless controllers are connected with the help of redundancy port.
--> All the access points are connected to Active Wireless Controller.
--> Active Wireless controller will send the access point information & client session information to Standby Wireless Controller.
--> In the event of failure of active wireless controller, all the access points are connected or terminated to standby wireless controller.
--> From Client perspective everything is transparent.
2) N+1 High Availability
--> N indicates how many controllers are required to support access points.
--> In N+1 High Availability method, one controller will be acting as backup controller for all the other wireless controllers.
--> In the event of failure of any active wireless controller, all the access points are connected or terminated to backup wireless controller.
--> There would be network outage for client.
3) N+N High Availability
--> In N+N High Availability method, one controller will be acting as backup controller for one wireless controller.
--> In the event of failure of any active wireless controller, all the access points are connected or terminated to backup wireless controller.
4) N+N+1 High Availibility
--> N+N+1 High Availability method is combination of N+1 and N+N High Availability.
--> N+N+1 High Availability method provides two backup controllers for every active wireless controller.
1) High Availability Pairing
--> Two wireless controllers will be acting as active/standby.
--> Active and Standby wireless controllers are connected with the help of redundancy port.
--> All the access points are connected to Active Wireless Controller.
--> Active Wireless controller will send the access point information & client session information to Standby Wireless Controller.
--> In the event of failure of active wireless controller, all the access points are connected or terminated to standby wireless controller.
--> From Client perspective everything is transparent.
2) N+1 High Availability
--> N indicates how many controllers are required to support access points.
--> In N+1 High Availability method, one controller will be acting as backup controller for all the other wireless controllers.
--> In the event of failure of any active wireless controller, all the access points are connected or terminated to backup wireless controller.
--> There would be network outage for client.
3) N+N High Availability
--> In N+N High Availability method, one controller will be acting as backup controller for one wireless controller.
--> In the event of failure of any active wireless controller, all the access points are connected or terminated to backup wireless controller.
4) N+N+1 High Availibility
--> N+N+1 High Availability method is combination of N+1 and N+N High Availability.
--> N+N+1 High Availability method provides two backup controllers for every active wireless controller.
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