The STP status of the switch port to which the AP is connected is changed

[Snika]

The STP status of the switch port to which the AP is connected is changed.
This symptom recurs daily and occurs on all switches.
As far as I know, APs don't participate in STP.
But why does the STP state change only on the port the AP is connected to?

[Brash]

The main issue in the loga shown are that the  port status is going down and then coming back up 4 hours later. The STP state change being logged immediately after the port status change is expected.

[Snika]

This port is a wireless AP.

As far as I know the wireless AP does not participate in STP.

I found from a web search that the NAC sensor might have internal AP detection.

I'm thinking of checking to see if there is such a feature in NAC.

[ww · Accepted solution]

Every stp enabled port goes through this states. it does not matter if this is a trunk, access port or a client that doesnt send bpdu's

[Snika]

Thank you for answer.
So, what action should I take?

[GreenMan]

As others have suggested - you probably need to focus on why the port went down   (and how it came back up again)    the STP messages you're seeing are expected, for a port going down, then recovering later.

[Snika]

I have set BPDU GUARD on the port since the issue occurred.

But the STP port change still happens.

I can't find any more reason

We are preparing to open a case for accurate cause analysis.