topic WLC 5508 - High Availability in Wireless

WLC 5508 - High Availability

aosandoval — Sun, 04 Jul 2021 03:47:52 GMT

I am upgrading the Wireless Infrastructure with two 5508 WLC.

I am setting up High Availability, but I think is not quite working.

Primary Controller = WLC1

Secondary Controller = WLC2

LAP = LAP1

LAP1 has WLC2 as the primary controller for HA

LAP1 has WLC1 as the secondary controller for HA

While connected to LAP1, I shutdown WLC2. After ~ 20 seconds, LAP1 move to WLC1.

I lost connection from LAP1

Don't LAP1 should move with all its clients to WLC1?

Am I missing something in my configuration?

Thanks for all your help in advance

WLC 5508 - High Availability

Stephen Rodriguez — Mon, 19 Sep 2011 21:53:18 GMT

Take a look at

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809a3f5d.shtml

you can adjust the 'heartbeat timers', as always double check this technote with the current configuration/release notes of the version you are running..

HTH,

Steve

WLC 5508 - High Availability

Leo Laohoo — Mon, 19 Sep 2011 22:05:30 GMT

If you go to the AP tab, High Availability tab, did you increase the Failover Priority to "Critical"?

WLC 5508 - High Availability

George Stefanick — Tue, 20 Sep 2011 02:41:11 GMT

Steve and Leo added great input.

I would also ADD. AP fall back. If you want your access points to FAIL BACK to their orginal controller when she comes back up. Make sure that AP FALL BACK is enabled.

That is all ...

WLC 5508 - High Availability

Leo Laohoo — Tue, 20 Sep 2011 02:42:53 GMT

By the way, what firmware are you running???

WLC 5508 - High Availability

aosandoval — Wed, 21 Sep 2011 18:01:13 GMT

I am running 7.0.116.0

I did all suggested changes, but still unable to roam seamless.

Thanks

WLC 5508 - High Availability

pcroak — Wed, 21 Sep 2011 18:30:04 GMT

Hello,

Let me clarify high availability/failover here. As previously mentioned, you can set the heartbeat times to reduce WLC failure detection time. Once an AP determines it has lost the connection to it's controller, it will perform the discovery/join process to the configured Secondary WLC. During this process, the AP will need to verify configuration from the secondary WLC and the Radios will get reset.

So, you will not experience a perfectly seamless transition when an AP moves from WLC1 to WLC2. Detection time with defaults is 30 second heartbeat, so I would expect anywhere from 15-45 second outage on a WLC failure scenario. The network will then be operational again and clients should be able to connect.

Thanks,

-Patrick Croak

Wireless TAC

WLC 5508 - High Availability

George Stefanick — Wed, 21 Sep 2011 22:16:23 GMT

ARE YOU SURE... You have the the proper WLC name and IP address in the high availability section ?