We have 2 data centers at different sites. We have 2 WAN connections and 2 WAN routers on each end for redundancy. We currently have 1 router at each end configured with a L2TPv3 tunnel extending a vlan104 across the 2 sites.
What is the recommended way to add a L2TPv3 tunnel to my redundant routers?
I'm cautious to simply pin up another L2 tunnel since I'm thinking spanning tree won't like having two L2 connections across the WAN.
You can manipulate the port cost under the interfaces in switch with
spanning-tree vlan cost - For Specific VLAN (or)
spanning-tree - For all VLANs
This way the port with higher cost become secondary and with lower one become primary.
You can refer to the document which explains basic STP configuration and understanding.