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Access Points Dropping Suddenly

New Contributor II
We have recently been experiencing issues with our AP's constantly dropping and coming back up. This has been happening constantly today alone, there is no obvious connection issues with our wiring. We have our AP's fairly spread since we have a grand total of 60 AP's we are a fairly large area and we have around 30 users who heavily rely on the Wi-Fi. 

Esteemed Contributor II
Examining the syslog from an affected AP's support info might provide a clue...

What version firmware running on your ZD, and what model AP(s)?

Do you have big flat subnet VLANs with lots of multicast/broadcast traffic?

Version9.10.0.0 build 218 and we are using mainly zf7762 outdoor ap's with a few t300's. 

To be honest I am not quite too sure how to answer that last question


Not sure if this is your issue, but I had a similar issue months ago and we suspected a wireless AP / controller issue.  It turned out that wasn't the problem.  It was an issue originating on the wire.

We had a single Lenovo PC with an i216/i217/i218 (not sure of the exact model) Intel NIC that was causing 100% of the issues. Here's a link to the problem:  But in short the Lenovo PC NIC / NIC drivers were sending IPv6 multicast traffic to ever port on the network.  This only happened when the PC entered a sleep state, so it wasn't consistent.  We would be fine for an hour or two and then we'd be down for 30 minutes to 4 hours.

The wireless symptom was that wireless clients would drop and an occasionally the AP's would drop and come back up.  The reason for that was that the AP's (7982's) were so busy processing multicast traffic that it couldn't service the wireless clients and if it was bad enough it didn't have time to make the heartbeat timeout with the controller so they used their controller based settings that are pushed to them, to reboot after 30 minutes of no connectivity with the controller.

Once we found the device mac using wireshark, we were able to narrow down the port the PC was plugged into and removed it from the network.  Problem solved.

Good luck with your issues.

You know that sounds like a strong possibility, we do have some laptops connected directly to access points because we need these running 24/7 as they monitor our greenhouses. i will look into using wireshark. i appreciate the response Todd