Erro STP BPDU sender conflit

[iagoaas]

Guys, can you help me, today I have this connection between the 2 MX and 2 MS with two links and a stack, but I am receiving many STP BPDU errors on ports 17 and 18 of the MS, which has caused instabilities in the network.

Can you tell me if this connection is recommended between the MX and the MS?
Today I have two links one for each MX but the stack.

To resolve network instability as a palliative today, the MS 02 is turned off, so I don't have a BPDU error on the network, but if he turns on the SW 02, the problem occurs again.

[alemabrahao]

Take a look at the documentation.

https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...

https://documentation.meraki.com/MX/Networks_and_Routing/MX_Layer_2_Functionality#Spanning_Tree_Prot...)

[Ryan_Miles]

MX doesn't support LACP. So, if you have LACP (port aggregation groups) configured on the switches delete those.

[ww]

Your switches are 1 stack? (I asume stack port 1 goes to 2)

Do you have the same native vlan on all ports in that drawing?

[iagoaas]

Your switches are 1 stack? (I asume stack port 1 goes to 2)

I have 2 stacs - SW01 port 1 goes SW2 port 2 and SW2 goes port1 sw1.

Do you have the same native vlan on all ports in that drawing?

YES

[alemabrahao]

Take a look at the documentation, there are some considerations. If you have LACP configured on the ports that MX is connected it will not work.

LACP & Link Aggregation

The MX does not run LACP or any link aggregation protocols. Connecting aggregated ports to the LAN of the MX is not supported; all connected ports should be un-aggregated. If multiple ports are connected to the MX from a single switch for redundancy, it is highly recommended that you run STP on that switch, to ensure that one of the redundant ports is safely put into a blocking state.

[KarstenI]

You hopefully don't have BPDU-Guard active on your ports to the MX?

[GIdenJoe]

That would effectively shut those ports down with a red indicator instead of the usual STP blocking sign.

[iagoaas]

this is my configuration on port from MS to MX.

[KarstenI]

Yes, but error descriptions are not always accurate and reflect the actual state ...

[iagoaas]

NO! this is my configuration on port from MS to MX.

[PhilipDAth]

My recommendation - only plug an MS into a single MX.  Remove those two redundant cables.

It will be rock solid reliable then.  IMHO, adding the extra cables, although intuitively increases redundancy, actually causes more failures.