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
Meraki Employee
Meraki Employee

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_... 

Ryan / Meraki Solutions Engineer

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3 Replies 3
Ryan_Miles
Meraki Employee
Meraki Employee

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_... 

Ryan / Meraki Solutions Engineer

If you found this post helpful, please give it Kudos. If my answer solves your problem please click Accept as Solution so others can benefit from it.

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

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."

Ryan / Meraki Solutions Engineer

If you found this post helpful, please give it Kudos. If my answer solves your problem please click Accept as Solution so others can benefit from it.
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