[spring] Resuming discussion on draft-ietf-spring-sr-service-p rogramming

(to: SPRING WG; cc: MPLS and 6MAN WGs)

Dear WG,

With the renewed interest in service programming at recent IETF meetings,
we would like to resume discussion on
draft-ietf-spring-sr-service-programming (“Service Programming with Segment
Routing”) to progress and complete this work as a solid foundation for
future proposals.

https://datatracker.ietf.org/doc/draft-ietf-spring-sr-service-programming/

This draft describes the data plane mechanisms required for service
segments and service programming in SR-MPLS and SRv6 networks. Its goal is
to enable the integration of physical or virtual network functions into SR
policies by associating each service with a SID.

The draft defines two types of services:

   - SR-aware services, which natively process SR information in packets
   - SR-unaware services, which require an SR proxy to handle or adapt SR
   headers before the service function processes the packet.

To support SR-unaware services, the draft specifies several SR proxy
behaviors, outlining their respective benefits and limitations.

Finally, the draft describes how service-related metadata can be carried in
both SR-MPLS and SRv6 packets.

We welcome any feedback, comments, or suggestions you may have on the draft.

Thanks,
Francois (on behalf of the co-authors)

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