Segment Routing IPv6 Prefix-SID
draft-previdi-isis-ipv6-prefix-sid-00

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Document Type Active Internet-Draft (individual)
Last updated 2015-11-18
Replaced by draft-bashandy-isis-srv6-extensions
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Network Working Group                                    S. Previdi, Ed.
Internet-Draft                                               L. Ginsberg
Intended status: Standards Track                             C. Filsfils
Expires: May 21, 2016                                Cisco Systems, Inc.
                                                       November 18, 2015

                    Segment Routing IPv6 Prefix-SID
                 draft-previdi-isis-ipv6-prefix-sid-00

Abstract

   This document defines the Segment Routing IPv6 Prefix-SID in the
   IPv4/IPv6 Extended Reachability Attribute Flags TLV.  The new flag is
   used for advertising the capability to handle the IPv6 Segment
   Routing header for the prefix that has the flag attached.

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 RFC 2119 [RFC2119].

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   This Internet-Draft will expire on May 21, 2016.

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   Copyright (c) 2015 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SRv6 Prefix SID . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   With Segment Routing (SR)[I-D.ietf-spring-segment-routing], a node
   steers a packet through an ordered list of instructions, called
   segments.  Segments are identified through Segment Identifiers (SIDs)
   that are advertised by routing protocols.  The IS-IS extensions for
   SR information advertisement are defined in
   [I-D.ietf-isis-segment-routing-extensions].

   Segment Routing can be directly applied to the IPv6 dataplane through
   the use of the Segment Routing Header defined in
   [I-D.previdi-6man-segment-routing-header].

2.  SRv6 Prefix SID

   When SR is applied to the IPv6 dataplane, Segment Identifiers (SIDs)
   are regular IPv6 addresses that are advertised in routing protocols.
   When SR is used over IPv6 dataplane, it is desirable to identify
   which of the prefixes originated by a node can be used as SIDs
   compared to any other prefix that the node advertises.

   [I-D.ietf-isis-prefix-attributes], defines the IPv4/IPv6 Extended
   Reachability Attribute Flags TLV.  This document defines the
   following new flag:

     S6-Flag (bit 3).
             SRv6 Prefix-SID flag: when set, the router
             indicates that the prefix this flag is attached
             to can be used as an IPv6 Prefix-SID.

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   The S6-Flag may also be set in conjunction with the Node-Flag (Bit 2)
   if the prefix does also identifies the node in the topology.

   In the case where the prefix has a shorter mask-length than 128 or
   when the prefix does not identify the node (e.g.: assigned to a
   physical interface instead of a loopback) the S6-Flag MAY be set and
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