Channel Assignments for APs & Clients

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  • Updated 2 years ago
Hopefully this is just due to my lack of knowledge, but when channels are set to auto, does an AP and the clients connected to that AP get assigned different channels?  I was assuming that whatever channel was assigned to the AP, the clients would be on the same channel.  What I'm seeing in my office is on our AP map the channel assigned to the AP is different than when I look at the list of clients connected to that AP, for most of the APs.  For instance, the map shows AP1 on channel 40, but the clients connected to AP1 are on channel 44.  AP2 on the map shows as being assigned channel 149, but the clients connected to AP2 are on channel 153.  AP3 on the map shows it as being on channel 161 and the clients connected to AP3 are on 161, except for one client that shows as being on channel 36.  AP4 on the map shows as being assigned channel 36 and the clients connected to AP4 are also on channel 36.  We're not experiencing any issues, I'm just wondering if that's the way it works, or should the clients connected to any AP be on the same channel as the AP.
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Rob Pritchard

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Posted 2 years ago

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Kevin Gee

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Hi Rob,
No you are correct , the clients have to be on the same channel as the AP to communicate.  I wonder whether you are seeing a bug that I think was specific to AP230s which mis-reported the AP channel in Hive Manager ... this was fixed in later HiveOS releases (6.6r2a I think).  
It may be worth connecting via SSH to AP1 and running 'sh acsp' to see what channel the device thinks it's on.
The only other things I can think of are some oddity relating to 40GHz or wider channels, or in the last case some effect of layer 3 tunnelling or something!? But I am pretty much guessing wildly on these points and don't really believe them myself ;-) Are you running anything like that?
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Rob Pritchard

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I jumped ahead and assigned channels to the APs to see what would happen, and after doing that the clients have the same channel as the AP, but for AP3, which I've assigned channel 161, it's showing (in Monitor) one client on channel 36, but when I ssh into this AP and do show station, this client is not listed, and the clients that are listed all show with the same channel as the AP.  

I'm running HiveManager 6.6r3a and the APs (all AP230) in my office are on Hive OS 6.6r2a Irvine.2309.  Because we're a school district and have moved to putting an AP in every classroom (I know, I know, I've heard the lecture :-)  ), one of the changes that my Aerohive SE just had me make was reducing the channel width from 80Mhz to 20Mhz so that there are more available channels on the 5Ghz spectrum.  We're not doing any tunnelling or anything unique.  We had been running all of our APs pretty much at their default settings out of the box until we started rolling out our Chromebooks over the past 2 months and they were experiencing connection issues, so we've adjusted power level settings, disabled 2.4Ghz in every other AP, etc., but that's been in the schools, not in my office.  I figured it might be some kind of but, just wanted to see if my thinking was correct.  I appreciate the response.
(Edited)