IPv6 Segment Routing Header (SRH)
draft-ietf-6man-segment-routing-header-15

Document Type Active Internet-Draft (6man WG)
Last updated 2018-10-22
Replaces draft-previdi-6man-segment-routing-header
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Network Working Group                                   C. Filsfils, Ed.
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                              S. Previdi
Expires: April 25, 2019                                           Huawei
                                                                J. Leddy
                                                              Individual
                                                           S. Matsushima
                                                                Softbank
                                                           D. Voyer, Ed.
                                                             Bell Canada
                                                        October 22, 2018

                   IPv6 Segment Routing Header (SRH)
               draft-ietf-6man-segment-routing-header-15

Abstract

   Segment Routing can be applied to the IPv6 data plane using a new
   type of Routing Extension Header.  This document describes the
   Segment Routing Extension Header and how it is used by Segment
   Routing capable nodes.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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 April 25, 2019.

Filsfils, et al.         Expires April 25, 2019                 [Page 1]
Internet-Draft      IPv6 Segment Routing Header (SRH)       October 2018

Copyright Notice

   Copyright (c) 2018 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing Extension Header  . . . . . . . . . . . . . .   4
     2.1.  SRH TLVs  . . . . . . . . . . . . . . . . . . . . . . . .   5
       2.1.1.  Padding TLVs  . . . . . . . . . . . . . . . . . . . .   6
       2.1.2.  HMAC TLV  . . . . . . . . . . . . . . . . . . . . . .   7
   3.  SR Nodes  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     3.1.  Source SR Node  . . . . . . . . . . . . . . . . . . . . .  10
     3.2.  Transit Node  . . . . . . . . . . . . . . . . . . . . . .  11
     3.3.  SR Segment Endpoint Node  . . . . . . . . . . . . . . . .  11
   4.  Packet Processing . . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Source SR Node  . . . . . . . . . . . . . . . . . . . . .  11
       4.1.1.  Reduced SRH . . . . . . . . . . . . . . . . . . . . .  12
     4.2.  Transit Node  . . . . . . . . . . . . . . . . . . . . . .  12
     4.3.  SR Segment Endpoint Node  . . . . . . . . . . . . . . . .  12
       4.3.1.  FIB Entry Is Locally Instantiated SRv6 END SID  . . .  12
       4.3.2.  FIB Entry is a Local Interface  . . . . . . . . . . .  14
       4.3.3.  FIB Entry Is A Non-Local Route  . . . . . . . . . . .  15
       4.3.4.  FIB Entry Is A No Match . . . . . . . . . . . . . . .  15
       4.3.5.  Load Balancing and ECMP . . . . . . . . . . . . . . .  15
   5.  Illustrations . . . . . . . . . . . . . . . . . . . . . . . .  15
     5.1.  Abstract Representation of an SRH . . . . . . . . . . . .  15
     5.2.  Example Topology  . . . . . . . . . . . . . . . . . . . .  16
     5.3.  Source SR Node  . . . . . . . . . . . . . . . . . . . . .  17
       5.3.1.  Intra SR Domain Packet  . . . . . . . . . . . . . . .  17
       5.3.2.  Transit Packet Through SR Domain  . . . . . . . . . .  17
     5.4.  Transit Node  . . . . . . . . . . . . . . . . . . . . . .  18
     5.5.  SR Segment Endpoint Node  . . . . . . . . . . . . . . . .  18
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