BGP-LS Extension for Inter-AS Topology Retrieval
draft-ietf-idr-bgpls-inter-as-topology-ext-07

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Last updated 2019-09-29
Replaces draft-wang-idr-bgpls-inter-as-topology-ext
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IDR Working Group                                                A. Wang
Internet-Draft                                             China Telecom
Intended status: Standards Track                                 H. Chen
Expires: April 2, 2020                                         Futurewei
                                                           K. Talaulikar
                                                           Cisco Systems
                                                               S. Zhuang
                                                     Huawei Technologies
                                                                   S. Ma
                                                   Mellanox Technologies
                                                      September 30, 2019

            BGP-LS Extension for Inter-AS Topology Retrieval
             draft-ietf-idr-bgpls-inter-as-topology-ext-07

Abstract

   This document describes the process to build Border Gateway Protocol-
   Link State (BGP-LS) key parameters in inter-domain scenario, defines
   one new BGP-LS Network Layer Reachability Information (NLRI) type
   (Stub Link NLRI) and some new inter Autonomous (inter-AS) Traffic
   Engineering (TE) related Type-Length-Values (TLVs) for BGP-LS to let
   Software Definition Network (SDN) controller retrieve the network
   topology automatically under various inter-AS environments.

   Such extension and process can enable the network operator to collect
   the interconnect information between different domains and then
   calculate the overall network topology automatically based on the
   information provided by BGP-LS protocol.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 2, 2020.

Wang, et al.              Expires April 2, 2020                 [Page 1]
Internet-Draft             BGP-LS-Inter-AS-Ext            September 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Inter-AS Domain Scenarios.  . . . . . . . . . . . . . . . . .   3
   5.  Stub Link NLRI  . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Inter-AS Native IP Scenario . . . . . . . . . . . . . . .   5
     5.2.  Inter-AS TE Scenario  . . . . . . . . . . . . . . . . . .   6
   6.  Inter-AS TE NLRI related TLVs . . . . . . . . . . . . . . . .   6
     6.1.  Remote AS Number TLV  . . . . . . . . . . . . . . . . . .   7
     6.2.  IPv4 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   7
     6.3.  IPv6 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   8
   7.  Topology Reconstruction.  . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  New BGP-LS NLRI type  . . . . . . . . . . . . . . . . . .   9
     9.2.  New Link Descriptors  . . . . . . . . . . . . . . . . . .  10
   10. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  10
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     11.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   BGP-LS [RFC7752] describes the methodology that using BGP protocol to
   transfer the Link-State information.  Such method can enable SDN
   controller to collect the underlay network topology automatically,
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