Network Service Header (NSH) and Segment Routing Integration for Service Function Chaining (SFC)
draft-ietf-spring-nsh-sr-01

Document Type Active Internet-Draft (spring WG)
Last updated 2019-10-04
Replaces draft-guichard-spring-nsh-sr
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SPRING                                                  J. Guichard, Ed.
Internet-Draft                                                   H. Song
Intended status: Standards Track                  Futurewei Technologies
Expires: April 6, 2020                                       J. Tantsura
                                                             Apstra inc.
                                                              J. Halpern
                                                                Ericsson
                                                           W. Henderickx
                                                                   Nokia
                                                            M. Boucadair
                                                                  Orange
                                                               S. Hassan
                                                           Cisco Systems
                                                         October 4, 2019

Network Service Header (NSH) and Segment Routing Integration for Service
                        Function Chaining (SFC)
                      draft-ietf-spring-nsh-sr-01

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.

Guichard, et al.          Expires April 6, 2020                 [Page 1]
Internet-Draft                 NSH-SR SFC                   October 2019

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  SFC Overview and Rationale  . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.3.  SFC within SR Networks  . . . . . . . . . . . . . . . . .   4
   2.  NSH-based SFC with SR-based Transport Tunnel  . . . . . . . .   5
   3.  SR-based SFC with Integrated NSH Service Plane  . . . . . . .   9
   4.  Encapsulation Details . . . . . . . . . . . . . . . . . . . .  11
     4.1.  NSH using MPLS-SR Transport . . . . . . . . . . . . . . .  11
     4.2.  NSH using SRv6 Transport  . . . . . . . . . . . . . . . .  12
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  UDP Port Number for NSH . . . . . . . . . . . . . . . . .  13
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