LISP Extensions for Segment Routing
draft-brockners-lisp-sr-01

Internet Engineering Task Force                             F. Brockners
Internet-Draft                                               S. Bhandari
Intended status: Standards Track                                F. Maino
Expires: August 17, 2014                                        D. Lewis
                                                                   Cisco
                                                       February 13, 2014

                  LISP Extensions for Segment Routing
                       draft-brockners-lisp-sr-01

Abstract

   Segment Routing (SR) combines source routing and tunneling to steer
   traffic through the transit network.  The Locator/ID Separation
   Protocol (LISP) separates IP addresses into Endpoint Identifiers
   (EIDs) and Routing Locators (RLOCs) and also leverages tunneling
   mechanisms.  Mapping between EIDs and RLOCs is facilitated by the
   LISP mapping system.  Combining LISP and SR enables the LISP mapping
   system to provide SR information to encapsulating routers so that
   traffic can be steered in the transit network or the list of segments
   a particular packet traverses is recorded in the packet header.

   This document describes extensions required to the Locator/ID
   Separation Protocol (LISP) to enable a LISP mapping system to
   communicate list of segment identifiers or the request to record the
   list of segments a particular packet traverses to the encapsulating
   router.

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Copyright Notice

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Use cases that combine LISP and SR . . . . . . . . . . . . . .  4
     3.1.  Traffic steering/traffic engineering . . . . . . . . . . .  4
     3.2.  Traffic tracing  . . . . . . . . . . . . . . . . . . . . .  5
   4.  LISP extensions to support SR  . . . . . . . . . . . . . . . .  5
     4.1.  Deployment Scenario  . . . . . . . . . . . . . . . . . . .  7
     4.2.  Example ELPs . . . . . . . . . . . . . . . . . . . . . . .  7
       4.2.1.  Example: ELP with only SR used . . . . . . . . . . . .  7
       4.2.2.  Example: ELP with SR and reencapsulating routers
               combined . . . . . . . . . . . . . . . . . . . . . . .  8
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   6.  Manageability Considerations . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   9.  Change log . . . . . . . . . . . . . . . . . . . . . . . . . . 10
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 10
     10.2. Informative References . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11

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1.  Introduction

   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths within network topologies by encoding paths as sequences of