I'm trying to track down the cause of this issue and wondering if anyone else has seen anything similar. We're seeing CPU utlization maxed out on an IAP-205 that uses AirGroup.
Background:
Hospitality environment running Instant APs.
We want to allow residents to use personal IoT devices (Chromecasts, FireSticks, Apple TVs, Smart Home Devices, etc.)
Using ClearPass to register resident devices, and Enforcing AirGroup Registration on the IAP, so that Resident A cannot cast to Resident B's devices, and vice versa.
What I'm seeing is occasional high CPU utilization. I belive it is causing clients to drop off.
TFC-Test AP205-cd:1a# show cpu details
Mem: 91052K used, 34712K free, 0K shrd, 0K buff, 27476K cached
Load average: 2.65 2.73 2.78 (Status: S=sleeping R=running, W=waiting)
PID USER STATUS RSS PPID %CPU %MEM COMMAND
2878 root R 1812 2753 68.8 1.4 mdns
2816 root R 752 2753 25.2 0.5 syslogd
5 root SW 0 2 2.9 0.0 events/0
10332 root R < 384 10320 1.9 0.3 top
2842 root S N 3600 2753 0.9 2.8 sapd
I also see some errors in logs related to MDNS, but not sure precisely what they mean. Same errors are repeating over and over tens of times per second.
TFC-Test AP205-cd:1a# show log debug
Dec 6 16:06:34 mdns[2878]: <121019> <ERRS> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| |aaa| Received attribute with invalid length -2 in rc_avpair_gen
Dec 6 16:06:34 mdns[2878]: <527003> <DBUG> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| CPPM mdns_cppm_handle_swarm_coa 1461 Successfully parsed all CPPM attributes using RADIUS library (librc)
Dec 6 16:06:34 mdns[2878]: <121019> <ERRS> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| |aaa| Received attribute with invalid length -2 in rc_avpair_gen
Dec 6 16:06:34 mdns[2878]: <527003> <DBUG> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| CPPM mdns_cppm_handle_swarm_coa 1461 Successfully parsed all CPPM attributes using RADIUS library (librc)
Dec 6 16:06:34 mdns[2878]: <121019> <ERRS> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| |aaa| Received attribute with invalid length -2 in rc_avpair_gen
Dec 6 16:06:34 mdns[2878]: <527003> <DBUG> |AP TFC-Test AP205-cd:1a@10.15.73.64 mdns| CPPM mdns_cppm_handle_swarm_coa 1461 Successfully parsed all CPPM attributes using RADIUS library (librc)
For reference, this is a proof of concept environment:
One 205 IAP with one SSID. 9 clients all authenticating via mac caching on ClearPass.
The above CLI output was taken with only two AirGroup services enabled (Googlecast and DIAL), and only 3 AirGroup servers online (Chromecast Ultra and Google Home Mini).
Has anyone ran into this before?