Switch Stacking

Solved
myndwire
Comes here often

Switch Stacking

Hey folks,

 

I just want to make sure this is a viable configuration, because I've been fighting some awful strange issues that I cannot explain, and Meraki support hasn't been an enormous help.

 

Scenario:

 

MS225-48FP access stack of 4 switches, configured in the typical ring fashion. LACP from switch 1 and 4 (2 links) to a single MS425-16 (core). MS425 is the sole device as STP root (priority 0). 

 

I am then doing root guard on core to access links, and loop guard on the other side, as well as loop guard on AP ports all across the access stack. I would imagine if there were any major problem with this setup, Meraki would complain somehow.

 

MS425-16 merely uplinks into my MX250. Every link in the scenario is a trunk.

1 Accepted Solution
Ryan_Miles
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I'd put BDPU guard on the access ports and root guard on the switch to switch links and leave it at that. 

 

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_... 

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3 Replies 3
Ryan_Miles
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I'd put BDPU guard on the access ports and root guard on the switch to switch links and leave it at that. 

 

https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_... 

myndwire
Comes here often

Root guard on the access switch side, core switch side, or both? I'd imagine just at the core.

Ryan_Miles
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Per the doc 

 

"It is recommended that Root Guard be applied to ports connecting to neighboring, downstream switches that should not be the Root Bridge, to prevent a superior BPDU from being received on the port and causing the election of an unexpected Root Bridge."

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