Distribution of Link-State and Traffic Engineering Information Using BGP
draft-ketant-idr-rfc7752bis-01

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Last updated 2019-07-09 (latest revision 2019-07-08)
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Inter-Domain Routing                                  K. Talaulikar, Ed.
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                              H. Gredler
Expires: January 9, 2020                                         Rtbrick
                                                               J. Medved
                                                     Cisco Systems, Inc.
                                                              S. Previdi
                                                  Individual Contributor
                                                               A. Farrel
                                                      Old Dog Consulting
                                                                  S. Ray
                                                  Individual Contributor
                                                            July 8, 2019

Distribution of Link-State and Traffic Engineering Information Using BGP
                     draft-ketant-idr-rfc7752bis-01

Abstract

   In a number of environments, a component external to a network is
   called upon to perform computations based on the network topology and
   current state of the connections within the network, including
   Traffic Engineering (TE) information.  This is information typically
   distributed by IGP routing protocols within the network.

   This document describes a mechanism by which link-state and TE
   information can be collected from networks and shared with external
   components using the BGP routing protocol.  This is achieved using a
   new BGP Network Layer Reachability Information (NLRI) encoding
   format.  The mechanism is applicable to physical and virtual IGP
   links.  The mechanism described is subject to policy control.

   Applications of this technique include Application-Layer Traffic
   Optimization (ALTO) servers and Path Computation Elements (PCEs).

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.

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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 January 9, 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
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   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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Motivation and Applicability  . . . . . . . . . . . . . . . .   5
     2.1.  MPLS-TE with PCE  . . . . . . . . . . . . . . . . . . . .   5
     2.2.  ALTO Server Network API . . . . . . . . . . . . . . . . .   7
   3.  BGP Speaker Roles for BGP-LS  . . . . . . . . . . . . . . . .   8
   4.  Carrying Link-State Information in BGP  . . . . . . . . . . .   9
     4.1.  TLV Format  . . . . . . . . . . . . . . . . . . . . . . .   9
     4.2.  The Link-State NLRI . . . . . . . . . . . . . . . . . . .  10
       4.2.1.  Node Descriptors  . . . . . . . . . . . . . . . . . .  15
       4.2.2.  Link Descriptors  . . . . . . . . . . . . . . . . . .  19
       4.2.3.  Prefix Descriptors  . . . . . . . . . . . . . . . . .  21
     4.3.  The BGP-LS Attribute  . . . . . . . . . . . . . . . . . .  23
       4.3.1.  Node Attribute TLVs . . . . . . . . . . . . . . . . .  24
       4.3.2.  Link Attribute TLVs . . . . . . . . . . . . . . . . .  27

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