I just read the new revision of draft-ietf-bess-service-chaining. Although
the draft doesn't use the RFC 8300 NSH, it could very easily take advantage
of features provided by the NSH (such as metadata) by adding NSH over MPLS
as defined in draft-ietf-mpls-sfc-encapsulation to the list of
encapsulations listed in section 2.5. And this draft provides an excellent
label distribution mechanism for NSH over MPLS. It would make a lot of
sense to add a reference to draft-ietf-mpls-sfc-encapsulation in the list
of encapsulations in section 2.5.

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