A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the
IETF.
Title : Network Service Header (NSH) and Segment Routing
Integration for Service Function Chaining (SFC)
Authors : James N Guichard
Haoyu Song
Jeff Tantsura
Joel Halpern
Wim Henderickx
Mohamed Boucadair
Syed Hassan
Filename : draft-ietf-spring-nsh-sr-02.txt
Pages : 17
Date : 2020-04-06
Abstract:
This document describes two application scenarios where Network
Service Header (NSH) and Segment Routing (SR) techniques can be
deployed together to support Service Function Chaining (SFC) in an
efficient manner while maintaining separation of the service and
transport planes as originally intended by the SFC architecture.
In the first scenario, an NSH-based SFC is created using SR as the
transport between Service Function Forwarders (SFFs). SR in this
case is just one of many encapsulations that could be used to
maintain the transport-independent nature of NSH-based service
chains.
In the second scenario, SR is used to represent each service hop of
the NSH-based SFC as a segment within the segment-list. SR and NSH
in this case are integrated.
In both scenarios SR is responsible for steering packets between SFFs
along a given Service Function Path (SFP) while NSH is responsible
for maintaining the integrity of the service plane, the SFC instance
context, and any associated metadata.
These application scenarios demonstrate that NSH and SR can work
jointly and complement each other leaving the network operator with
the flexibility to use whichever transport technology makes sense in
specific areas of their network infrastructure, and still maintain an
end-to-end service plane using NSH.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-nsh-sr/
There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-nsh-sr-02
https://datatracker.ietf.org/doc/html/draft-ietf-spring-nsh-sr-02
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-nsh-sr-02
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