I think you can use different vlan ids on both sides, but the VC identifier has to be same on both sides. As far as vc-type is concerned, one is vlan based forwarding and other is port based forwarding. This doc talks about that :
Thanks for your response. I don't understand what is the difference between vc-type vlan and vc-type ethernet. Once the command is applied on Interface vlan, I can`t understand the difference between "port" based forwarding and "vlan" based forwarding.
In vlan based VCs we encapsulate all traffic received on the subinterface into the EoMPLS VC - this includes the dot1q vlan tag and and 802.1p bits.
In port mode (VC type ethernet) we strip the outer vlan tag (if there is one - like in the case of dot1q tunnels) and transport the rest over EoMPLS.
If you use different vlans at each end of the VC, IOS should be able to do a vlan re-write in the case of a vlan based VC. You could probably force the VC to be port mode (ethernet type) by adding the VC-type command after the "mpls l2-transport" command to see if that helps. (Could be an IOS inter-op issue if this does not work on its own)
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