I have an RFS-4000 cluster managing a mix of 6532 and 6562 access points. I have 5 WLANs, all of which are enabled on all radios, and using the default profile for each access point type. All WLAN traffic is tunneled through the controller. The configuration is quite basic, and it has been up and running for several years, without any significant adjustments.
We had a UPS failure several months ago, and the primary controller, as well as about half of the access points lost power. After restoring power, we have two WLANs (out of five) that are acting funny. The main problem I am having is that sometimes, when clients are successfully associated on one of the affected WLANs, no traffic seems to be tunneled out to the rest of the network. DHCP fails immediately, and even when assigning a static IP address and DNS, the wireless client is unable to communicate with anything else on the network.
The thing that makes this particularly confusing is that other WLANs on the same access point function fine at the same time. And functionality on the affected WLAN can be rock solid when associating with a different access point. Given that the WLAN and AP policies are the same across the entire configuration, and all traffic is tunneled, I'm not understanding why the issue would only affect a subset of the WLANs on a subset of the APs.
My ability to perform trial and error troubleshooting is very limited, as I am not located at the site, and the facility operates 24/7. Therefore I'm trying to line up some specific ideas about thing I can investigate or try when I am able to schedule a maintenance window.
Has anyone else seen an issue like this before? Any thoughts on a good way to start investigating?