BGP-LS Extension for Inter-AS Topology Retrieval
draft-ietf-idr-bgpls-inter-as-topology-ext-03

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Last updated 2019-07-03
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: January 2, 2020                                       Futurewei
                                                           K. Talaulikar
                                                           Cisco Systems
                                                                   S. Ma
                                                   Mellanox Technologies
                                                            July 1, 2019

            BGP-LS Extension for Inter-AS Topology Retrieval
             draft-ietf-idr-bgpls-inter-as-topology-ext-03

Abstract

   This document describes the process to build BGP-LS key parameters in
   inter-domain scenario, defines one new BGP-LS NLRI type(Stub Link
   NLRI) and some new inter-AS TE related TLVs for BGP-LS to let 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 January 2, 2020.

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

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Inter-AS Domain Scenarios.  . . . . . . . . . . . . . . . . .   3
   4.  Stub Link NLRI  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Inter-AS Native IP Scenario . . . . . . . . . . . . . . .   5
     4.2.  Inter-AS TE Scenario  . . . . . . . . . . . . . . . . . .   5
   5.  Inter-AS TE NLRI related TLVs . . . . . . . . . . . . . . . .   6
     5.1.  Remote AS Number TLV  . . . . . . . . . . . . . . . . . .   6
     5.2.  IPv4 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   7
     5.3.  IPv6 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   7
   6.  Topology Reconstruction.  . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  New BGP-LS NLRI type  . . . . . . . . . . . . . . . . . .   9
     8.2.  New Link Descriptors  . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  10
   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,
   but normally it can only get the information within one IGP domain.
   If the operator has more than one IGP domain, and these domains
   interconnect with each other, there is no mechanic within current
   BGP- LS to transfer the interconnect topology information.

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