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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