Multiple Cisco Wireless LAN Controllers

We are preparing for an expansion of wireless coverage in our facility, and will need to grow from our current 10 access points to around 18.  We currently have a Cisco WLC-2112 as the wireless LAN controller.

Can we add another WLC-2112 to the network and have them both work together, or do we need to scrap the existing and put a new WLC-2125 in place?
gwermterAsked:
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Craig BeckConnect With a Mentor Commented:
You can do either.

If you don't care about redundancy, you can replace the 2112 with a 2125.  If the WLC fails your wireless network will cease to function.  If you want redundancy for "some" of your APs add a second 2112.

I say "some" because you want to add APs to bring the total number to more than 12.  This will mean you will have to spread out the APs between the two WLCs.  This is fine, but if 1 WLC dies you can only use 12 of your APs until you fix the dead WLC.

If you want complete redundancy you'll need at least 2x 2125s or 2x 2112s.

You'll need to configure Mobility between the two WLCs to enable AP load-balancing and to allow seamless roaming between APs connected to different WLCs.  Also you'll need to configure the same settings on each WLC.  The only things that should be different on the WLCs are the IP addresses on the interfaces you've created.  Most importantly, software versions should be the same (although they don't absolutely have to be).
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gwermterAuthor Commented:
Wonderful, thank you for the answer.  Ciso pre-sales support indicated that I could not have two WLC-2112s on the network, which seemed wrong to me.
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Craig BeckCommented:
No problem - just for clarification here is the relevant supporting documentation...

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6521/product_bulletin_c25-471258_ps7206_Products_Bulletin.html

(See table 2)
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