Statically the PSA value constantly fall on DHCP

Apologies if that was brought up earlier but I couldn't find anything about it.

We currently lack three WLC with more than 1,000 PSA reached and be monitored etc. All access points are defined statically and however work very well, at random, but often an AP will be forced on DHCP and change its IP address. Very annoying when what they are monitored via the static addresses and our constantly monitoring software flags 'down' access points when they are actually up. Once the AP is restarted it will jump on the static address without any problem. I'm working on why this happens in the first place. Any help would be appreciated.

Update: I noticed that availability information on the controllers for an AP not «ask» themselves on the access point itself. Often, when I telnet in an AP that we no information of the controller or the wrong controller (if it has been moved through scheduled maintenance work, he still holds the previous controller if high availability information says something else entirely), this could be a key factor?

WLC: 2 x 5505 Cisco and Cisco 8500 (that happens on all the controllers of three, recently updated the firmware)

WAP: 1042n, 1602i

Please see screenshot of the newspaper of an AP that has recently done.

Thank you

 I have noticed that the high availability information set on the controllers for an AP are not 'applying' themselves on the AP itself. When I telnet into an AP it can often have no controller information or the wrong controller

This is normal & global backup controller configuration is not spread to AP auto. You must configure the AP high availability with primary, secondary, tertiary WLC with name & IP if you want failover predictive for a given AP. see below for more details

http://mrncciew.com/2013/04/07/AP-failover/

 if it was moved through planned maintenance, it still holds the previous controller though the high availability information says otherwise), could this be a key factor? 

If you do not configure the HA on AP field, still can remember WLCs all available within your environment & try to register one of them if AP has experienced a power failure. But no preference where he will go unless HA domain configured on the AP.

Regarding the AP forcing DHCP static, it is also part of the WLC discovery process. For some reason any if AP registered WLC was unavailable, he'll try to discover other WLC. After different discovery method, force of will AP cycle & repeat the discovery process. Discovery using DHCP is an option. Here is some basic information about the registration of the AP

http://mrncciew.com/2013/03/17/AP-registration/

I would try to reserve addresses IP through DHCP for the AP. In this case AP should get the same IP via DHCP & your control can be done as it is.

HTH

Rasika

Pls note all useful responses *.

Tags: Cisco Wireless

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