topic two controllers on the same subnet in Wireless

two controllers on the same subnet

axfalk — Sat, 03 Jul 2021 21:07:19 GMT

One of our office that already has 1 2000 controller needs to install another one. Can the new controller be on the same subnet as the old one or does it have to be on a different subnet?

thanks

Re: two controllers on the same subnet

ankbhasi — Thu, 24 May 2007 13:05:17 GMT

Hi Friend,

You can have both the controllers in same subnet as well as on different subnet.

If they are on same subnets things are bit easy.

I will recommend you to read this link and see if this helps you

http://www.cisco.com/univercd/cc/td/doc/product/wireless/control/c44/ccfig41/c41mobil.htm

Please come back if you have any doubts.

HTH

Ankur

*Pls rate all helpfull post

Re: two controllers on the same subnet

axfalk — Tue, 29 May 2007 21:41:55 GMT

Thanks for your response...Is having a mobility group a requirement for inter-controller roaming? I can see a benefit of having a mobility group in controller redundancy, but other than that, what sets it apart?

thanks again...

Re: two controllers on the same subnet

rseiler — Wed, 30 May 2007 00:47:07 GMT

At a minimum, your 2000 controller is on *THREE* networks: The management interface, the AP manager interface, and *AT LEAST* one interface for an SSID.

Therefore, I don't understand your question. The mobility group will work as long as the controllers can communicate with each other. The more important question is what happens to the wireless client data once it leaves the controller.

In most all cases, multiple controllers *MUST* terminate the client VLAN traffic on the same layer 2 infrastructure. This limits the topology significantly.

Isn't the 2000 controller EOL and doesn't it have significant mobility restrictions anyway?

Re: two controllers on the same subnet

axfalk — Wed, 30 May 2007 01:02:51 GMT

Thanks for your response. We have 2 controllers that are on the same subnet. Do I need to create a mobility group for clients to roam from an access point joined to one controller to an access point joined to the other controller?

Thanks again...

Re: two controllers on the same subnet

rseiler — Wed, 30 May 2007 01:06:24 GMT

Roaming is an 8 hour conversation in itself, but I will answer your question with a 'yes', you should have a mobility group defined if wireless clients may move between APs associated with different controllers.

Roaming actually has much more to do with the wireless security in use, the config of the client and back-end user database, and the layer 2 connectivity of the multiple controllers.

If you are using WEP or WPA pre-shared-key with the same layer-2 termination on the controllers, then your users really aren't 'roaming' at all, they are constantly re-associating to the different APs anyway.

Roaming, in my mind, means 'fast roaming' meaning less than 100 ms. This would require either Cisco proprietary CCKM, or some of the *sort of* WPA2 fast-reconnect features.