Segment Routing IPv6 Prefix-SID
draft-previdi-isis-ipv6-prefix-sid-01

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Document Type Active Internet-Draft (individual)
Last updated 2015-12-14
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: June 16, 2016                               Cisco Systems, Inc.
                                                       December 14, 2015

                    Segment Routing IPv6 Prefix-SID
                 draft-previdi-isis-ipv6-prefix-sid-01

Abstract

   This document defines the Segment Routing IPv6 Prefix-SID sub-TLV.
   This new sub-TLV allows to specify which of the prefixes advertised
   by a node are to be used as Segment Routing Identifiers (SID) for the
   IPv6 dataplane.

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 is submitted in full conformance with the
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   This Internet-Draft will expire on June 16, 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 . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

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].

   When applied to the IPv6 dataplane, the SID is represented by an IPv6
   address.  This document defines a new IS-IS Prefix sub-TLV where
   information related to the IPv6 address used as SR-IPv6 SID is
   conveyed.

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.  Moreover, and
   in order to provide the same functionalities defined in
   [I-D.ietf-spring-segment-routing] and
   [I-D.ietf-isis-segment-routing-extensions], a new sub-TLV is defined:
   the SRv6-Prefix-SID sub-TLV

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   A SRv6-Prefix-SID sub-TLV is associated to a IPv6 prefix advertised
   by a node and MAY be present in any of the following TLVs:

      TLV-236 (IPv6) defined in [RFC5308].

      TLV-237 (MT-IPv6) defined in [RFC5120].

   The SRv6-Prefix-SID sub-TLV has the following format:
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