Hi,
You can actually configured an MPLS TE tunnel over the path of your choice and force the L2VPN traffic over this tunnel using the following command:
"preferred-path interface tunnel <your tunnel interface> disable-fallback"
If the path you selected is over one specific uplink and this uplink goes down, then the pseudowire will also go down.
For more information on this feature, please refer to the following document:
https://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp1057815
Regards,
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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