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Community Member

AP's are overloaded in cisco wlc 5508

Hello,

I just observed some of our ap's are overloaded while other ap's having least number of clients.

E.g, Ap1- 18 clients, Ap2 - 2 clients (both aps are registered to the same controller)

Total we have around 200 ap's. How can i resolve this issue...?

WLC -5508

Version- 7.5

AP's- 3600

Thanks in advance

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Re: AP's are overloaded in cisco wlc 5508

There is a feature on the WLAN call client load balancing. Even though it is there, it is suggested you keep it disabled. This feature uses status code 17 which many devices do not support. This means clients can end up having issues associating which I have seen in the past.

The way to solve your issue, in many cases, is to set the max and min tx power levels. Set the max to maybe 17dbm and the min to 8 or 11dbm. You don't want your tx power going too low like in the 6-8 power level range or else devices will not want to associate to that AP. Also tweaking the data rates helps also. Disabling the lower data rates helps clients not be too sticky.

If a survey was done and the tx power was at 17dbm when they performed a survey, then it's safe to make the max and min what is suggested. If a survey wasn't done, then you have to play around with the max and min and data rates until you tweak it enough that it works for you.

Sent from Cisco Technical Support iPhone App

-Scott
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7 REPLIES
VIP Purple

AP's are overloaded in cisco wlc 5508

HI Prasan,

The clients will always be connected to AP whose signal power is best of all, if same SSID is being broadcast!!

Check the power level of each and every AP.

Regards

Community Member

AP's are overloaded in cisco wlc 5508

Power is been set as global. Eventhough if i want to do equal loadbalancing, will it work?

VIP Purple

AP's are overloaded in cisco wlc 5508

AP Loadbalacing ?

You can perform AP load balancing on two (or more) WLCs if you       configure mobility groups properly. The LWAPP allows for dynamic redundancy and       load balancing.

***Normally Client decide that on whcih AP I should join , client roaming decision is made by client. There are no control over this on WLC/AP.

Regards

Community Member

AP's are overloaded in cisco wlc 5508

Client Loadbalancing ...? is not possible ..?

VIP Purple

AP's are overloaded in cisco wlc 5508

No...

There is not a way to force the client to use a specific AP from the controller side of things.  As per the specs the client decides when and where to associate.  You could try disabling some of the lower data rates or lowering the AP's tx power to reduce the coverage cell of each AP.  By doing this the client might not see the other AP as favorable.

Regards

VIP Purple

Re: AP's are overloaded in cisco wlc 5508

There is a feature in WLC called Aggresaive Load balancing. You can try to enable that :

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809c2fc3.shtml

https://supportforums.cisco.com/docs/DOC-20630

Be Aware:

*****

  • A client that has already been authenticated and associated is never           removed from the system as a result of aggressive load-balancing.           Load-balancing only happens at the association phase.

  • This feature is implemented on a per-controller basis. This means           that APs in the same geographic area must all logically connect back to the           same WLC if Aggressive load-balancing is desired.

Hope it helps.

Regards

Hall of Fame Super Silver

Re: AP's are overloaded in cisco wlc 5508

There is a feature on the WLAN call client load balancing. Even though it is there, it is suggested you keep it disabled. This feature uses status code 17 which many devices do not support. This means clients can end up having issues associating which I have seen in the past.

The way to solve your issue, in many cases, is to set the max and min tx power levels. Set the max to maybe 17dbm and the min to 8 or 11dbm. You don't want your tx power going too low like in the 6-8 power level range or else devices will not want to associate to that AP. Also tweaking the data rates helps also. Disabling the lower data rates helps clients not be too sticky.

If a survey was done and the tx power was at 17dbm when they performed a survey, then it's safe to make the max and min what is suggested. If a survey wasn't done, then you have to play around with the max and min and data rates until you tweak it enough that it works for you.

Sent from Cisco Technical Support iPhone App

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