WLC (4402) Controller Redundancy

andrew-mccabe · ‎01-22-2009

I currently have 1 x 4402 Controller setup in the HQ. This has a failry extensive wireless environment.

If there was to be a failure then the HQ has lost all Wireless communications.

I would like to implement another controller and use this as a backup.

Anyone have any implementation thoughts surrounding this? best practice and anything I need to consider?

Thanks

jeff.kish · ‎01-22-2009

1. Add a second controller that is the same size controller that you currently have. Be careful to never exceed the total capacity of a single controller, or else you lose your full redundancy.

2. Keep the controller at the same site, but connect it to a different switch in your core. If you are connecting it to a chassis switch, connect the two cables to different blades for highest redundancy.

3. Configure each controller to use LAG (Etherchannel).

4. Split your access points between the two controllers. Best practice is to group APs together that are physically close, so roaming occurs between APs that are on the same controller. Don't "checkboard" your APs when assigning primary controllers.

I hope this helps!

Jeff

andrew-mccabe · ‎01-23-2009

Many thanks for your words of advice. I will certainly be able t take this away and use it.