Its CCI or ACI interference?

[eigrpy]

Hi Please see the below picture. there are two ssid signals overlapping, which come from the same AP. Can we think it has ACI or CCI interference? Thank you

[Scott Fella]

Well, are you 100% sure its the same AP?  Also check to see if your ap has a third radio known as a FRA.  This can enable a micro radio per say on an existing access point(s) that is capable.  Check the mac address on your tool or should I say BSSID and verify if the mac address are identical or not.

[Scott Fella]

Take a look at this link aslo: https://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/810/user_guide/b_ME_User_Guide_810/specify_wireless_setgs.html#task_1DEE1213F0D142CD918D23DD04565CBC

[eigrpy]

Hi Scott,

Yes, it is coming from the same AP because the two signals disappear once the AP is powered off. 

[Scott Fella]

So did you look at the link? Your ap has a second 5ghz radio or not?

[patoberli · Accepted solution]

Based on your screenshot, those are two different BSSID. This is completely normal to show up like this. As it's the same AP and probably Radio (compare the MAC addresses of the BSSID, if the last character is +- 1 it's typically the same radio), you will not have CCI or ACI. 

[eigrpy]

Thank you very much. I think you are right. Its two ssid from one AP. so under one WLC, if the two signals overlap and the signal come from different AP, we need to change one of channel number, right? for get rid of CCI or ACI? 

[Scott Fella]

David,

As long as the controllers are part of the same rf group and mobility is configured, then one of the controllers would be the rf master and would know fo the rf environment.  You should not have to make a static change or a temporary change with RRM.

[eigrpy]

we only have one controller there. question is under one WLC, if the two signals overlap and the signal come from different AP, we need to change one of channel number, right?

[Scott Fella · Accepted solution]

Yes you do.  RRM only works when there are three access points that can "hear" each other.  If less than three, then manual changes are required.

[eigrpy]

After I checked it, it is two SSID from the same AP. can we configure it at the two different channels for the two SSID separately? Thank you

[patoberli]

No, but this is absolutely no problem. What you could do, define one bssid for the 2.4ghz radio and the other for the 5ghz one. I would not do this.

[Scott Fella]

You can always manually set the channels. RRM works well only if you have three aps that can hear each other. If you are testing and the two radios are on the same channel, manually change then to a channel that works best in your environment.