Spanning Tree always noticed on event log

[AYEN]

Hi,

   I have noticed that spanning tree always see in event log in some of my switchport eventhough the connected device is Meraki MR. Is this normal? or I have to check on my config.

[ww]

It is a event of the port going down and up. I assume this is not good when there is a AP connected to that port.  

This should only happen at firmware upgrades or port/power schedules.

Check if the cable is good.

and the switch has enough poe power (in case you have many PoE devices)

[cmr]

It looks like bad cabling to me, is it a CAT6a run all the way from the switch to the AP?  Anything less and you'd be better to limit the AP to auto negotiate only up to 1Gb/s.

[AYEN]

@cmr Yes, it's CAT6 run all the from AP to switch. what do you mean to limit the AP to auto negotiate?

[AnthonyN]

Hey @AYEN 

+1 to the other responses here, the spanning tree events are just a response to the physical port flaps. ie when a port goes down, spanning tree state moves to disabled, when port comes up it moves to designated/root state

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Spanning_Tree_Protocol_(STP)_Overvie...

I agree, run some cable tests to ensure the cable is good, remove the AP and plug it directly into the switchport with a known working cable to see if you get the same issues. The port flapping events is purely based on Layer 1 (whether the interface is up or down), nothing to do with software.