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HOW WISM LOAD BALANCING WORKS ?

abelleli71
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

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.

View solution in original post

23 Replies 23

abelleli71
Level 1
Level 1

One solution can be the Configuring Auto-Anchor Mobility ?

Make sure you have your mobility groups setup on each wlc. Also make sure you have set the primary, secondary and or tertiary wlc on the ap. Last but not least, verify that you have ap fallback enabled on the wlc's. This option will forces the ap to go back to the primary wlc that is is configured for.... as long as everything is configured correctly.

-Scott
*** Please rate helpful posts ***

Make sure you have your mobility groups setup on each wlc.

YES I HAVE

Also make sure you have set the primary, secondary and or tertiary wlc on the ap

I HAVE TO CHECK IT ON THE AP ?

you have ap fallback enabled on the wlc's

ON THE WLC ? OR ON THE AP ?

thanks a lot

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.

Jeff explained it perfectly.... test it with one ap first just in case. If that ap works, then you can go a head and make the changes to the rest of the ap's.

-Scott
*** Please rate helpful posts ***

To make my AP come back up to the previous position I have to place the FALLBACK and then RESET the AP ....or just place the FALLBACK and wait ?

Just enable fallback. If that doesn't work, then you have some configuration issue.

-Scott
*** Please rate helpful posts ***

Correct. And if AP fallback is not enabled, simply reset the access point to have it join its primary again.

Hello

just check with my client the WISM configuration and the FALLBACK is enable on the PRIMARY SECONDARY etc..

When reload the APs ( 80 AIRONET ) the NEVER come back on the PRIMARY or SECONDARY but they register with other CONTROLLERS

Do I have to create different MOBILITY GROUP for each zone ?

Now I have only one mobility Group ( with 6 WISM MODULE )

ThanKS

Just to clarify, have they configure primary, secondary, and tertiary controllers on each access point individually (through the WLC)?

Be sure that they're using WLC names and not IP addresses.

They have configured PRIMARY , SECONDARY etc..

They use IP address ...Can cause a problem ?

Yes, you should configure it with the controller name, not IP address. Try that and let us know what happens.

Hello

we are very unlucky becasue our host-name is too long for the field in the GUI of WLC

gobbi-wism-a-manager.sw.unibocconi.it

I see also that is not possible to insert via CLI...

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