to make the L2TPv3 pseudowire the backup link you need to manipulate STP parameters on LAN switches that connect to the WAN routers, so that the link becomes STP blocked on one side for all vlans of interest.
for example you can increase STP cost with
spanning-tree cost 3000
in interface configuration mode on LAN switches
Be aware that the amount of L2 traffic can be too much for your routers so you should use it only for specific vlans, the few Vlans that you are extending between the two data centers
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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