topic As all controllers are in HA in Wireless

WLC-redundancy

Irshad Mohammed Hussain — Mon, 05 Jul 2021 12:36:28 GMT

Guys

I have 3 WLC Controllers at three different locations as shown below and all of them are having HA, can I make some federation or any redundancy with this, in case if one site WLC fail AP's at that will register to other locations?

WLC 5520

Software Version

8.2.100.0

WLC 5508

Software Version

8.0.121.0

WLC 5520

Software Version

8.2.110.0

Read THIS.

Leo Laohoo — Thu, 11 Aug 2016 06:48:29 GMT

Read THIS.

All the mentions WLC's are

Irshad Mohammed Hussain — Thu, 11 Aug 2016 09:09:36 GMT

All the mentions WLC's are having different Versions , what will be the behavior of AP's when they move across?

The controllers all have

Leo Laohoo — Thu, 11 Aug 2016 10:56:57 GMT

The controllers all have different firmware versions. So when the APs move back and forth between different controllers the APs will be forced to download the appropriate firmware. During that time the APs will NOT be servicing any wireless clients.

This is the reason why we DO NOT recommend controllers running different firmware versions. It's just dumb.

As all controllers are in HA

Irshad Mohammed Hussain — Thu, 11 Aug 2016 12:53:19 GMT

As all controllers are in HA ,do I need to upgrade code for both WLC's in HA or only Primary ?

I assume you are not in HA

George Stefanick — Thu, 11 Aug 2016 18:35:31 GMT

I assume you are not in HA SSO mode and you are just doing high availability.

Problem is one one an ap joins a wlc with a different code it will upgrade or down grade and reboot. Not good practice. Your primary and backup should always be on the same rev.

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Yes all my WLC's are in HA

Irshad Mohammed Hussain — Sun, 14 Aug 2016 05:42:08 GMT

Yes all my WLC's are in HA SSO

do I need to upgrade code for

Leo Laohoo — Tue, 23 Aug 2016 02:29:10 GMT

do I need to upgrade code for both WLC's in HA or only Primary ?

It's not a question of "do I need to".

There are legitimate reasons why the controllers are running different firmware. If one of the key objective is to ensure the APs have minimal impact during fail-over (from one controller to another), then yes, it makes common and logical sense to ensure all the controllers share the same configuration & firmware version.

George (below) runs and manages wireless for health care environment. Common sense dictates the APs need to operate with minimal disruptions necessary.

On the other hand, I manage wireless of a different arena and I don't necessarily have to have my controllers running the same firmware version because I don't have that kind of "mandate". However, I chose to run the same firmware to make troubleshooting easier.