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Discussions
Q4: does it require VLAN swapping/switching ?
R4: not mandatory and (taking a minimalistic assumption of VLAN continuity) just mandate ensuring per-port (not per node or other instance) VLAN interpretation and thus constraining the LSP ? equivalent to a continuity principle (this can be tackled by using the label set mechanism)

However, VLAN_ID may be translated when crossing a node using a similar table as the one written in Appendix A of
PPT Version