topic You have any AP's on that in Wireless

High Availability Problem with 2504

hacizeynal — Mon, 05 Jul 2021 13:22:09 GMT

Hi dears ,I have 2 off 2504 wireless controllers ,each of them has respectively 50 and 75 AP license count. I followed https://rscciew.wordpress.com/2014/06/07/n1-high-availability-configuration-on-cisco-2504wlc/ guide for configuring it ,i guess I have done all steps ,for testing purposes I just reloaded one AP which it's primary WLC is second WLC ,once it boots up it should be registered with Backup WLC ,but it doesnt .what can I check for this problem ?

Thanks !

It's best to define the

Scott Fella — Mon, 16 Jan 2017 17:44:34 GMT

It's best to define the primary and secondary WLC on each AP. This way when an AP reboots of their primary controller goes down or is unreachable, the AP knows what controller it needs to join. Have you done this?

-Scott

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Hi Scott ,

hacizeynal — Mon, 16 Jan 2017 17:49:18 GMT

Hi Scott ,

Thanks for reply ,yes from All APs and from high availability I added ip addresses of my WLCs respectively .

Make sure that the WLC

Scott Fella — Mon, 16 Jan 2017 17:53:54 GMT

Make sure that the WLC hostname is correct. The input is case sensitive also. With setting the primary and secondary if an AP still doesn't join their primary after a reboot, make sure that there are available AP license on the controller. Also you can console into the AP and see what is actually happening. It can be that the entry on the AP is not correct and you might also have DNS or option 43 discovery on your network.

Are the controllers on the same subnet? Does the AP end up joining the backup or not?

-Scott

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All APs and 2 WLC are on same

hacizeynal — Mon, 16 Jan 2017 17:57:37 GMT

All APs and 2 WLC are on same subnet ,so we don't need option 43 ,unfortunately the APs are located in remote site .I am pretty sure that hostnames are correctly entered

If AP's are ona different

Scott Fella — Mon, 16 Jan 2017 18:00:47 GMT

If AP's are ona different subnet from the controllers, you either have to use DNS, option 43 or broadcast discovery when initially priming the AP's. now if these AP's have been up and you have issue now, help me understand what is happening and how are you testing? Where are the AP's located... in the same country, etc.

-Scott

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Let's say like that ,I have a

hacizeynal — Mon, 16 Jan 2017 18:07:02 GMT

Let's say like that ,I have a venue with 20 APs ,all of them are located geographically in same place ,I have configured 1 WLC with 50 AP license (2504 ) ,then I wanted to add redundancy ,2504 does not support SSO mode ,so we have to configure (N+1) mode ,all APs are registered in 1st WLC ,I configured the second WLC per guide ,but failover is happening when I disconnect 1st WLC

With N+1 you need to have

Scott Fella — Mon, 16 Jan 2017 18:11:24 GMT

With N+1 you need to have mobility group setup and up. With the same mobility group name, the controller provides the AP's with a list of controllers. Using the high availability on each AP's helps you set what should be primary and backup. Enabling fallback on each controller allows the AP's to join its primary when it is available.

If you have an AP on WLC 1, you can specify the primary as WLC 2 and the secondary as WLC 1. If the AP doesn't move, then you have an issue somewhere. This is a test you should be able to do.

-Scott

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Should the group names same

hacizeynal — Mon, 16 Jan 2017 18:58:40 GMT

Should the group names same in Mobility Group ? I have different names

Should be especially since

Scott Fella — Mon, 16 Jan 2017 18:59:56 GMT

Should be especially since you are doing N+1. The RF Group should also be the same and the VIP.

-Scott

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I made them same ,reload the

hacizeynal — Mon, 16 Jan 2017 19:18:42 GMT

I made them same ,reload the first WLC but unfortunately failover did not happen

Something isn't setup right.

Scott Fella — Mon, 16 Jan 2017 19:21:53 GMT

Something isn't setup right. If you just unplug WLC 1, does the AP's move eventually? They should if there is connectivity between the AP and the WLC 2 and the high availability is defined properly.

-Scott

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Actually not ,they are not

hacizeynal — Mon, 16 Jan 2017 19:23:07 GMT

Actually not ,they are not registering with second WLC

I realized that the number of

hacizeynal — Mon, 16 Jan 2017 19:33:50 GMT

I realized that the number of APs have increased in WLC1 from 50 to 75 after I have configured Group names same ,but failover is not happing.

You have any AP's on that

Scott Fella — Mon, 16 Jan 2017 20:01:38 GMT

You have any AP's on that controller? If not, then you have a config issue.

-Scott

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For me I think I have

hacizeynal — Mon, 16 Jan 2017 20:04:53 GMT

For me I think I have everything true ,Scott if I have give you control can we tshoot it together for 5-10 minutes ?

If you hit the max AP count

Scott Fella — Mon, 16 Jan 2017 20:05:26 GMT

If you hit the max AP count for that WLC license, then AP's will not join. Each controller license is separate from one another if for example you have a max of 75 AP's, then you need 75 AP license count for each controller. Max supported on the 2504 is 75.

-Scott

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I can help, but it's a

Scott Fella — Mon, 16 Jan 2017 20:09:14 GMT

I can help, but it's a holiday today and im not in front of my computer.

i would verify that the controller can PING the AP and that the time in the controller is correct and the country code is also correct. Best to maybe backup both controller and open up the backup in a text editor and run a diff between the two at least make sure most of the co fig is the same the hostname and IP address should be different along with the mobility group macs should be swapped.

-Scott

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Thanks ! I will check again

hacizeynal — Mon, 16 Jan 2017 20:12:11 GMT

Thanks ! I will check again ,unfortunately WLCs dont run debug commands ,it will be more easy to troubleshoot

WLC do have debug commands.

Scott Fella — Mon, 16 Jan 2017 20:20:12 GMT

WLC do have debug commands. Here is a link to troubleshoot AP joins:

http://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless-controllers/119286-lap-notjoin-wlc-tshoot.html

-Scott

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