So I've been troubleshooting this one for a long time. I have a large wireless deployment (several hundred APs) connected to 3850 Cisco POE switches. Sporadically, APs will go down. This is completely random, no more than 1 or 2 APs a day, and always different ones, so I'm fairly certain that rules out cabling issues. And sometimes it will be several days without an outage.
The APs will show up as "Not Joined" in the WLC, which points me to the switch. From there, the AP port shows up connected, but a show power inline command will show the port as IEEE Device instead of the usual AIR-AP1852I-B-K9. The power wattage is correct, but it will not show up on CDP. A quick shut/no shut always fixes the issue.
The first thing I would tell myself if I weren't me is to check the cable, but of course this seems very unlikely due to the random nature. The port configuration is pretty straightforward, APs are connected to access ports with a single access VLAN. and we are definitely not exceeding our POE budget. I run a lot of wireless sites and they are all configured more or less the same, and I have never experienced this anywhere else. The only thing different about this site is the switch and AP models, so maybe it's something different about their code?
Googling didn't come up completely dry, and I found a few others with the issue. One interesting thread said he changed the ports to trunk but didn't elaborate on why that fixed the issue. I was under the impression that trunk ports for APs was a bit outdated from a design standpoint.
Overall this is a minor annoyance but still frustrating to deal with, thank you in advance for any suggestions or thoughts.
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