Just wanted to thank everyone who contributed to this thread. I was able to piece together your collected knowledge and get a basic alerting system going to send notifications when APs on our network go up and down. This has been a goal of mine for some time now. I owe its accomplishment to all of you.
Thanks!
This alert was working great for us for a few weeks and then suddenly stopped working. Now I am having a hard time even getting the default “ap deleted=1” rule to work properly.
Does not appear to be a larger issue with notification settings/transport settings as I am still getting alerts for down devices that I have other rules for.
Might I need to adjust some settings in the database? I’d love to get this rule working again. If anyone has any suggestions, I am all ears!
Let me know if I can provide you with any additional information.
Thanks so much
Just tried setting up the same alert and it is not working. AP Name isn’t being displayed.
You can use this Nagios Plugin as a Service in LibreNMS and it works great for us.
Use the flag “–showerror_only” to see only the APs which are down.
@temporal-lin Are you able to share a screenshot of the service you have working (blank/blur any specific IPs etc) ?
Thanks
Here you go! 
Host IP for the WLC IP address and SNMP for SNMP Community string.
P.S: You might have to change the permission on “/var/nagios_plugin_cache/” if there is no file after running the script for the first time. This is where it stores online AP MAC Address and name.
“sudo chmod o=rw -R /var/nagios_plugin_cache/” should do the job.
Hello!
Is it possible to see what AP who is down in the output of the check_snmp cisco wlc script?
Best regards!
I Answer myself: Yes it shows the AP who is down
I am actually on Cisco 9800 and no AP count can be seen and SSID was also missing. Any one has this problem too? Alerts on AP down is another problem too
