LAG on WLC 5508

Rizky Chandra · ‎03-07-2023

Hi there,

I have two 5508 WLC use for controlling Access Point (of course), I have already enabled LAG on the WLC, and it connects each other for redundancy/back up in case if one of the WLC fails. I'm sorry I really don't know to much about WLC especially the LAG features.

In my case, the WLC connects to the Core Switch by using only 2 Ports on the WLC. (2 ports on "main" WLC, and 2 Ports on said "back up" WLC therefore 4 Ports in total connects to Core Switch).

The big question is, I want to use all the remaining 6 Ports on the "main" WLC and ignore the other 6 Ports on the "back up" WLC to save up some budget. is it possible to do that? will it cause some problem on the configuration? I know it will cause problems in the future, but if the "main" WLC fails can I just transfer it to the "back up" WLC?

I hope someone could help me solve the case. Thank you.

marce1000 · ‎03-07-2023

- Basically the controller HA SSO configuration must always be completely symmetrical between active and standby controller ,

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Rizky Chandra · ‎03-07-2023

So, I can't just adding ports to the active controller, and not adding ports to the stand by?

haorzhao · ‎03-08-2023

Yes , If you want "back up" WLC to back up "main" WLC , you must connect both wlc to your core Switch .

And LAG is nothing to do with WLC sso , it is just a way to backup the port .

For example , if you LAG port 1 and port 2, when your port 1 have issue ,then the traffic can continue with port 2.

Rizky Chandra · ‎03-08-2023

Well... That's unfortunate. Okay I'll try to make them symmetrical, I'll give you guys an update once I working on it.

Thank you very much for all of your responses.

David Ritter · ‎03-09-2023

It should not be an issue. on the switch side it is just a port channel. operationally there is no requirment for the 2 channels to be the same size. the Primary unit has 8 pors in its PC and fi the secondary only has 2, that is functional. The issue might be that when the pair swap active/standby, there could a thruput crunch but it would give you time to service the problem child.

I have 8 in one and 7 in the other as I stole a port for a packet monitor assignment. remember, to LAG one must be tag the manabement vlan