LISP Control Plane integration with NSH
draft-ermagan-lisp-nsh-04

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Last updated 2017-09-26
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LISP Working Group                                            V. Ermagan
Internet-Draft                                                  P. Quinn
Intended status: Experimental                                   D. Lewis
Expires: March 30, 2018                                         F. Maino
                                                                F. Coras
                                                       Cisco Systems Inc
                                                      September 26, 2017

                LISP Control Plane integration with NSH
                       draft-ermagan-lisp-nsh-04

Abstract

   This document defines extensions to the LISP control plane protocol
   to enable support for Network Service Header(NSH) based Service
   Function Chaining (SFC).

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   This Internet-Draft will expire on March 30, 2018.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  LISP Model of Service Function Chaining . . . . . . . . . . .   2
   3.  Service Path Encoding . . . . . . . . . . . . . . . . . . . .   3
     3.1.  SPI LCAF  . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  LISP ITR Processing . . . . . . . . . . . . . . . . . . . . .   4
   5.  LISP Map-Server Processing  . . . . . . . . . . . . . . . . .   4
   6.  Packet Flow Example . . . . . . . . . . . . . . . . . . . . .   4
   7.  Multiple Data Planes  . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   5
   11. Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Locator/ID Separation Protocol (LISP) [LISP] defines a control
   plane for driving dynamic network overlays, and can be used with
   various encapsulations such as VXLAN, LISP, VXLAN-GPE[VXLAN-GPE], NV-
   GRE.

   VXLAN-GPE defines an extension to the LISP and VXLAN encapsulations
   with multi-protocol support, enabling encapsulation of any inner
   payload, including IP, Ethernet, and NSH [NSH].

   This document defines the necessary extensions to the LISP control
   plane to support driving a dynamic NSH-based service function chain (
   map-and-encap based on SPI and SI).  These extensions enable a LISP
   xTR [LISP] or a service node [SFC] to use the LISP control plane for
   dynamically looking up the next hop's locator in the service path.

2.  LISP Model of Service Function Chaining

   The NSH header [NSH] identifies the service path that a packet
   belongs to, and the next hop in the path for that packet via the
   Service Path Identifier (SPI) and Service Index (SI) fields in the
   Service Path header, as depicted in the figure below.

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Service Path ID              | Service Index |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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   To provide a dynamic overlay for NSH packets using LISP, the
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