Well, not if one controller is always the primary and another is always the backup.
There is a command for entering both a primary and backup controller. If I wanted to assign a primary and backup controller IP to an AP group, I would enter the following:
ap system-profile "CorporateAP"
lms-ip 10.1.1.200
bkup-lms-ip 10.2.2.200
!
Then, to apply this profile to my AP group, I could add it to my AP group config:
ap-group "CorpAP_Group"
ap-system-profile "CorporateAP"
!
This would have the effect that all AP's in AP Group "CorpAP_Group" will have a primary LMS IP of 10.1.1.200, and a backup LMS IP of 10.2.2.200.
So what if I want to split my AP's?
I have two major sites; one in NYC and one in LA. I want my East Coast AP's to use NYC as their primary, and LA as their backup. On the other hand, I want my West Coast AP's to use LA as their primary and NYC as their backup.
In this case, we'll have to define two system profiles, and two AP Groups as follows:
ap system-profile "EastCoastAP"
lms-ip 10.1.1.200
bkup-lms-ip 10.2.2.200
!
ap system-profile "WestCoastAP"
lms-ip 10.2.2.200
bkup-lms-ip 10.1.1.200
!
ap-group "EastAP_Group"
ap-system-profile "EastCoastAP"
!
ap-group "WestAP_Group"
ap-system-profile "WestCoastAP"
!
Now we've achieved the desired result.
I hope this helps!
- Jay