BGP Extensions for IPv6 Compressed Routing Header (CRH)
draft-alston-spring-crh-bgp-signalling-01

Document Type Active Internet-Draft (individual)
Last updated 2019-07-24
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
SPRING Working Group                                           A. Alston
Internet-Draft                                              D. Henriques
Intended status: Standards Track                          Liquid Telecom
Expires: January 25, 2020                                      R. Bonica
                                                        Juniper Networks
                                                           July 24, 2019

        BGP Extensions for IPv6 Compressed Routing Header (CRH)
               draft-alston-spring-crh-bgp-signalling-01

Abstract

   This document describes a new BGP extension for signalling the
   mapping between Segment Identifiers (SID's), as used by a SRv6+
   Compressed Routing Header (CRH) and the IPv6 Addresses they
   represent.  The extension defines both a new optional BGP attribute
   to signal the Maximum SID Value (MSV) and a new Sub-Address Family
   (SAFI) of the IPv6 Address family.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 25, 2020.

Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Alston, et al.          Expires January 25, 2020                [Page 1]
Internet-Draft          SRv6+ CRH BGP Signalling               July 2019

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  SID Signalling  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  NLRI Format . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Subsequent Address Family Identifiers (SAFI) Parameters .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Overview

   The SRv6+ Compressed Routing Header uses an ordered sequence of
   segment identifiers (SID) to specify the end to end path a packet
   should follow through the network.  This allows for much smaller
   header sizes than found in the SRH (Segment Routing Header), which
   utilizes an ordered sequence of 128 bit IPv6 address to achieve the
   same goal.  In addition, this method prevents the overloading of the
   IPv6 address space.

   This results in the need to signal the mapping between the SIDs used
   in the CRH and the IPv6 addresses they represent.  While such
   signalling can be achieved through IGP extensions
   [I-D.bonica-lsr-crh-isis-extensions] in a single network domain,
   circumstances may dictate that the SID to address mapping be signaled
   both to systems that do not partake in the IGP used within that
   network domain, and between autonomous systems.

   It is envisaged that such signalling will be required to signal,
   among other things, deep packet inspection systems and flow analysis
   systems that need the ability to see the full path a packet is
   traversing, while at the same time not necessarily partaking in the
   IGP which would normally be used for such signalling.  This also
   allows signalling of SID to Address mapping in environments that do
   not run an IGP capable of such signalling.

Alston, et al.          Expires January 25, 2020                [Page 2]
Internet-Draft          SRv6+ CRH BGP Signalling               July 2019

2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
Show full document text