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2960S stack and dual connection to client

Hi,

We have a stack of 2960S, and a client wants to dual connect 2 of there switches to us(Diverse fibre path) - The ports connecting to the client will be trunks, with vlans 250->255.

After some advice as to how to achieve the following with spanning tree (We run MST, client runs PVRST)

Trunk port 1 is to be "primary" for vlans 250->255

Trunk port 2 is the be "backup" for vlans 250->255

We want to ensure we remain root bridge for those vlans.

Thanks in advance for any advice.

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