BGP Control Plane for NSH SFC
draft-ietf-bess-nsh-bgp-control-plane-09

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Document Type Active Internet-Draft (bess WG)
Last updated 2019-03-06 (latest revision 2019-03-01)
Replaces draft-mackie-bess-nsh-bgp-control-plane
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BESS Working Group                                             A. Farrel
Internet-Draft                                        Old Dog Consulting
Intended status: Standards Track                                J. Drake
Expires: September 7, 2019                                      E. Rosen
                                                        Juniper Networks
                                                               J. Uttaro
                                                                    AT&T
                                                                L. Jalil
                                                                 Verizon
                                                           March 6, 2019

                     BGP Control Plane for NSH SFC
                draft-ietf-bess-nsh-bgp-control-plane-09

Abstract

   This document describes the use of BGP as a control plane for
   networks that support Service Function Chaining (SFC).  The document
   introduces a new BGP address family called the SFC AFI/SAFI with two
   route types.  One route type is originated by a node to advertise
   that it hosts a particular instance of a specified service function.
   This route type also provides "instructions" on how to send a packet
   to the hosting node in a way that indicates that the service function
   has to be applied to the packet.  The other route type is used by a
   Controller to advertise the paths of "chains" of service functions,
   and to give a unique designator to each such path so that they can be
   used in conjunction with the Network Service Header defined in RFC
   8300.

   This document adopts the SFC architecture described in RFC 7665.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 7, 2019.

Farrel, et al.          Expires September 7, 2019               [Page 1]
Internet-Draft               BGP for NSH SFC                  March 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.1.  Overview of Service Function Chaining . . . . . . . . . .   6
     2.2.  Control Plane Overview  . . . . . . . . . . . . . . . . .   7
   3.  BGP SFC Routes  . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Service Function Instance Route (SFIR)  . . . . . . . . .  12
       3.1.1.  SFI Pool Identifier Extended Community  . . . . . . .  13
       3.1.2.  MPLS Mixed Swapping/Stacking Extended Community . . .  14
     3.2.  Service Function Path Route (SFPR)  . . . . . . . . . . .  14
       3.2.1.  The SFP Attribute . . . . . . . . . . . . . . . . . .  15
       3.2.2.  General Rules For The SFP Attribute . . . . . . . . .  20
   4.  Mode of Operation . . . . . . . . . . . . . . . . . . . . . .  21
     4.1.  Route Targets . . . . . . . . . . . . . . . . . . . . . .  21
     4.2.  Service Function Instance Routes  . . . . . . . . . . . .  21
     4.3.  Service Function Path Routes  . . . . . . . . . . . . . .  21
     4.4.  Classifier Operation  . . . . . . . . . . . . . . . . . .  23
     4.5.  Service Function Forwarder Operation  . . . . . . . . . .  24
       4.5.1.  Processing With 'Gaps' in the SI Sequence . . . . . .  25
   5.  Selection in Service Function Paths . . . . . . . . . . . . .  26
   6.  Looping, Jumping, and Branching . . . . . . . . . . . . . . .  28
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