Level code 5508 in HA mode without interruption

I'm going to do my first upgrade with 5508 s in HA mode, and from what I've read that the APs will have restart all at the same time and load the new code that is pushed to her advance. I work in an environment where downtime is very difficult to have. In the old days, I had autonomous controllers and I restarted about 1/5 of the APs at a time and move them between controllers I therefore had no interruption of service.

Is it possible to upgrade HA without restarting all the APs at the same time? I guess I can't break the AP since my second controller a HA licenses and may not be used in stand-alone mode. The next option is the purchase of an another 5508, but I am looking at about $60 k for a controller that will sit around most of the time doing nothing.

If you have a controller of + 1 in addition to the HA pair you can transfer access points as you did on your old days, I think the more practical way to proceed this case is to use the option of prior downloading on access points.

What this will do is to previously install the new software for the access points so when you reload your controllers LAN wireless access point will skip the process of 'Download' and they will join immediately.

There will be a downtime and what is expected on the HA environments due to restart you need to synchronize the WLCs and when you upgrade all WLC.

As the pair of WLCs in HA can be considered as a whole unit, there is no way to avoid a downtime with two WLC (without breaking HA).

Tags: Cisco Wireless

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