HOW WISM LOAD BALANCING WORKS ?

We currently have a campus with 4 WISM on 4 6509 .
After a reload of one of these WISM, all the AP ( AIR-AP1231 ) disappear from this WISM :
(WiSM-slot1-2) >show ap summary
Number of APs.................................... 1
Before the reload this WISM has 80 AP .
The other 79 AP are now registered with another WISM .
Is this normal or ( load balancing ) or what ?
Any help is apreciated

You have to check the primary/secondary/tertiary settings on the WLC, but for each access point. Go to the Wireless tab and click on an access point for this setting.
AP Fallback mode is on the WLC under the Controller tab. It forces an access point to join its primary controller if possible. If it's disabled, the access point will be happy to stay on a non-primary controller until it reboots. If it's enabled, then as soon as its primary becomes available (either because it comes up or because you specify a new primary), it will join that controller.
AP Fallback is convenient for load-balancing, but it can cause significant downtime if a controller goes down and comes back up immediately. All your APs will fail over to another controller at the initial drop, but they'll all switch back over once the original controller comes back. Each time will cause clients to drop. If a controller starts flapping for any reason, your wireless network will be seriously disrupted. Of course, if you leave it disabled and a controller goes down, all access points will hop over to their secondary controller and never go back. This isn't so bad, though, because you can just manually set it for AP fallback at a convenient time, let them all switch back, and then disable fallback again.
If you do not active AP fallback mode, be sure to reset each AP after you give it a primary/secondary/tertiary controller. Otherwise it will sit tight on the current controller.
Also, make sure that the Master Controller mode is disabled. This forces all access points to join it if you have no primary controller listed. It's under the Controller tab, under Advanced.

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