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Cisco AP: "least congested channel" among 1,6,11 - doesn't work

Posted on 2011-09-02
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Last Modified: 2012-05-12
Hello,
I have deployed 3 Cisco 1142 APs in a conference room with 130 people.
The APs are configured on DCA for channels 1,6,11.
I would expect the APs to automatically spread among these 3 channels and instead I have 2 APs on 1 and 1 on 11.
Please, do not answer, "DCA is not reliable". I have extensive case studies from Cisco discussing the advantages on choosing DCA over manual channel selection.

Thanks,
Roberto.
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Question by:martineit
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martineit earned 0 total points
ID: 36475381
Here is the answer I got from Cisco support.
I understand you have selected to use the least congested channel on the APs to use only channels 1,6 and 11, but on a meeting room you have three APs, and two of them are on the same channel 1. This could be normal since basically the APs are automatically selecting which is the least congested channel to operate, it could be that the two APs on same channel are far enough from each other and then they get to operate on the same channel with no problem. The DCA feature is not a feature on Autonomous or Stand Alone APs since the APs are not communicating to each other, they just scan the frequencies and then they select the channel based on this scan, they don’t know or don’t have information about other APs on the same area. The DCA feature it is a feature for lightweight APs managed by a Wireless LAN controller.

It is normally mandatory before implementing a Wireless Network, to perform a site survey so it can be determined which should be the right channel to assign to an AP radio and also which could be the best location for the AP for the best radio coverage and throughput performance on the Wireless Network so also for best practices and according to that site survey you should select the channels statically.

Let me share with you also the following documentation web link regarding configuring radio channel settings on an stand alone or autonomous AP:

http://www.cisco.com/en/US/docs/wireless/access_point/12.2_11_JA/configuration/guide/s11rf.html#wp1037361
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by:martineit
ID: 36475385
I got the answer from Cisco support
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