BGP Control Plane for NSH SFC
draft-mackie-bess-nsh-bgp-control-plane-01

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BESS Working Group                                             A. Farrel
Internet-Draft                                                  J. Drake
Intended status: Standards Track                                E. Rosen
Expires: May 3, 2017                                    Juniper Networks
                                                               J. Uttaro
                                                                    AT&T
                                                                L. Jalil
                                                                 Verizon
                                                        October 30, 2016

                     BGP Control Plane for NSH SFC
               draft-mackie-bess-nsh-bgp-control-plane-01

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.

   This document adopts the SFC architecture described in RFC 7665.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Farrel, et al.             Expires May 3, 2017                  [Page 1]
Internet-Draft               BGP for NSH SFC                October 2016

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 3, 2017.

Copyright Notice

   Copyright (c) 2016 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Functional Overview . . . . . . . . . . . . . . . . . . .   5
     2.2.  Control Plane Overview  . . . . . . . . . . . . . . . . .   7
   3.  BGP SFC Routes  . . . . . . . . . . . . . . . . . . . . . . .   9
     3.1.  Service Function Instance Route (SFIR)  . . . . . . . . .  10
     3.2.  Service Function Path Route (SFPR)  . . . . . . . . . . .  10
       3.2.1.  The SFP Attribute . . . . . . . . . . . . . . . . . .  11
       3.2.2.  General Rules For The SFP Attribute . . . . . . . . .  15
   4.  Mode of Operation . . . . . . . . . . . . . . . . . . . . . .  16
     4.1.  Route Targets . . . . . . . . . . . . . . . . . . . . . .  16
     4.2.  Service Function Instance Routes  . . . . . . . . . . . .  17
     4.3.  Service Function Path Routes  . . . . . . . . . . . . . .  17
     4.4.  Classifier Operation  . . . . . . . . . . . . . . . . . .  19
     4.5.  Service Function Forwarder Operation  . . . . . . . . . .  19
   5.  Selection in Service Function Paths . . . . . . . . . . . . .  20
   6.  Looping, Jumping, and Branching . . . . . . . . . . . . . . .  21
     6.1.  Protocol Control of Looping, Jumping, and Branching . . .  22
     6.2.  Implications for Forwarding State . . . . . . . . . . . .  23
   7.  Advanced Topics . . . . . . . . . . . . . . . . . . . . . . .  23