MS225 Port shuts down with third party switch

[JordanNolan]

We have a Dell Powerconnect switch plugged into one of our ports on a Meraki MS225.  Throughout the day the port on the Meraki MS225 where the Dell is plugged in will shutdown/disable.  Years ago when I was using Cisco Catalyst switches I recall having to disable a setting on the ports with 3rd party switches.  What would that be on the Meraki MS225?

[Raj66]

Hi @JordanNolan Do you BPDU guard enabled on that port by any chance?

[JordanNolan]

STP Guard is set to Disabled (default)

[ww]

it says nothing is connected or does the port give you a message? any logging on both devices related to this event that you can share with us?

is it a trunk port or a access port?

[JordanNolan]

The port is Trunk. I catch it intermittently so I do not see if the port is dark on the dashboard or anything.  It just acts as though it is turned off:

Here are some logs.  Same thing over and over:

Jul 9 07:07:42 Port STP change
Port 8 disabled→designated
Jul 9 07:07:42 Port status change
port: 8, old: down, new: 1Gfdx
Jul 9 07:07:37 Port STP change
Port 8 designated→disabled
Jul 9 07:07:37 Port status change
port: 8, old: 1Gfdx, new: down
Jul 9 07:07:33 Port STP change
Port 8 disabled→designated
Jul 9 07:07:33 Port status change
port: 8, old: down, new: 1Gfdx
Jul 9 07:07:29 Port STP change
Port 8 designated→disabled

[Raj66]

That seems like the port is flapping. Can you try a different cable or different port on both sides and see if the problem still exists?

[JordanNolan]

Hi Raj,

Was still an issue.  Patch cables tested OK on both a meter and through the console.  

[dalmiroy2k · Accepted solution]

Go to the port settings in Switch | Switch Ports and disable both RSTP and STP guard.

[JordanNolan]

I will give that a try and see if it stablizes

[CWK_Rob]

I had the same issue and disable RSTP and RSTP Guard resolved it. 

I had a remote switch connected through an ISP provided L2 circuit, managed by their Cisco switch.  Uplink was up/down frequently.  Disabling RSTP on the remote switch's Uplink port stabilized things.  Should I also disbale RSTP on the core-side switch port?

[CWK_Rob]

I had the same issue and disable RSTP and RSTP Guard resolved it. 

I had a remote switch connected through an ISP provided L2 circuit, managed by their Cisco switch.  Uplink was up/down frequently.  Disabling RSTP on the remote switch's Uplink port stabilized things.  Should I also disbale RSTP on the core-side switch port?