Hello together,
today I discovered an issue with the automatic channel assignement of my aruba infrastructure, where many 5 GHz radios are going offline for a time of 30 - 45 minutes. I discovered the issue during a site survey with Ekahau, where half of my infrastructure (20 of 30 APs in one building) didn't show me a 5 GHz channel. The behavior was checked in one building with 30 APs, which were installed by me around 2 months ago.
I checked the behavior for affected APs on my controller via "show ap arm history ap-name <AP Name>". You can see the output at the attachement.
The AP seems to decides for a new channel all the time and sometimes turns it's radio off, when the RF density of neighbors seems high enough.
Is this really the excepted behavior of ARM?
The first site survey was done at the building when I turned all radios online manually. There were many overlapping channels at the time, because ARM needed more time to adjust the channel selection.
Right now, the result seems really problematic to me. The building is missing signal when radios turn of at the same time, even if neighbors adjust the transmit power.
RF settings are configured as following:
Country code:
Germany
Assigned and fixed channel bandwidth:
40 MHz
Used Channels:
UNII-2: Channels 52-56, 60-64
UNII-2 Extended: 100-104, 108-112, 132-136
Excluded Channels:
UNII-1: All excluded on purpose
UNII-2 Extended: DFS channels 116-120,124-128
A few words to my topology:
I have a master-standby topology, to which two local controllers are attached. One of the local controllers is used for a pool of AP-315 access points, that connect to the local controller via LMS IP. The second local controller is defined as secondary LMS.
Hardware specifications:
Master: Aruba7240 - Firmware 6.5.0.4_58404
Standby: Aruba7240 - Firmware 6.5.0.4_58404
Locals: Aruba7240XM - Firmware 6.5.0.4_58404
Used APs:
30x Aruba AP-315 in this building
Could someone give me a hint what is wrong here? We will migrate to AOS 8.3 in future and probably Airmatch will fix this, but right now ARM is needed.
Thanks a lot and have a great day.