A Framework for Constructing Service Function Chaining Systems Based on Segment Routing
draft-li-spring-sr-sfc-control-plane-framework-01

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SPRING Working Group                                               C. Li
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                  A. Sawaf
Expires: May 7, 2020                               Saudi Telecom Company
                                                                   R. Hu
                                                                   Z. Li
                                                     Huawei Technologies
                                                        November 4, 2019

A Framework for Constructing Service Function Chaining Systems Based on
                            Segment Routing
           draft-li-spring-sr-sfc-control-plane-framework-01

Abstract

   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  Segment routing architecture can be implemented over an
   MPLS data plane as well as an IPv6 data plane.

   Service Function Chaining (SFC) provides support for the creation of
   composite services that consist of an ordered set of Service
   Functions (SF) that are to be applied to packets and/or frames
   selected as a result of classification.

   SFC can be implemented based on several technologies, such as Network
   Service Header (NSH) and SR.  This document describes a framework for
   constructing SFC based on Segment Routing.  The document reviews the
   control plane solutions for route distribution of service function
   instance and service function path, and steering packets into a
   service function chain.

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Li, et al.                 Expires May 7, 2020                  [Page 1]
Internet-Draft         SR based SFC Control Plane          November 2019

   This Internet-Draft will expire on May 7, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview of SR Based SFC Control Plane  . . . . . . . . . . .   4
   3.  Stateless SR Based SFC  . . . . . . . . . . . . . . . . . . .   6
     3.1.  Service Function Instance Route Distribution  . . . . . .   6
     3.2.  Service Function Path Route Distribution  . . . . . . . .   7
     3.3.  Steer Packets into SFC  . . . . . . . . . . . . . . . . .   7
   4.  Stateful SR Based SFC . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Service Function Route Distribution . . . . . . . . . . .   8
     4.2.  Service Function Path Route Distribution  . . . . . . . .   8
     4.3.  Steer Packets into SFC  . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Segment routing (SR) [RFC8402] is a source routing paradigm that
   explicitly indicates the forwarding path for packets at the ingress
   node by inserting an ordered list of instructions, called segments.
   When segment routing is deployed on MPLS data plane, it is called SR-
   MPLS [I-D.ietf-spring-segment-routing-mpls].  When segment routing is
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