BGP-LS Extension for Inter-AS Topology Retrieval
draft-ietf-idr-bgpls-inter-as-topology-ext-01

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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: September 8, 2019                           Huawei Technologies
                                                                   S. Ma
                                                        Juniper Networks
                                                           March 7, 2019

            BGP-LS Extension for Inter-AS Topology Retrieval
             draft-ietf-idr-bgpls-inter-as-topology-ext-01

Abstract

   This document describes the process to build BGP-LS key parameters in
   multi-domain scenario, defines one new BGP-LS NLRI type(Inter-AS TE
   Link NLRI) and some new inter-AS TE related TLVs for BGP-LS to let
   SDN controller retrieve the network topology automatically under
   various environments.

   Such process and extension can enable the network operator to collect
   the connection 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

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   This Internet-Draft will expire on September 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Wang, et al.            Expires September 8, 2019               [Page 1]
Internet-Draft             BGP-LS-Inter-AS-Ext                March 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Inter-AS Domain Scenarios.  . . . . . . . . . . . . . . . . .   3
     3.1.  IS-IS/OSPF Inter-AS Native IP Scenario  . . . . . . . . .   4
     3.2.  IS-IS/OSPF Inter-AS TE Scenario . . . . . . . . . . . . .   5
   4.  Inter-AS TE Link NLRI . . . . . . . . . . . . . . . . . . . .   5
   5.  Inter-AS TE NLRI related TLVs . . . . . . . . . . . . . . . .   5
     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
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   9
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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 general TLV within current
   BGP- LS to transfer the interconnect topology information.

   Draft [I-D.ietf-idr-bgpls-segment-routing-epe] defines some
   extensions for exporting BGP peering node topology information
   (including its peers, interfaces and peering ASs) in a way that is
   exploitable in order to compute efficient BGP Peering Engineering
   policies and strategies.  Such information can also be used to
   calculate the interconnection topology among different IGP domains,
   but it requires the border routers to run BGP-LS protocol and report
   the information to the PCE/SDN controller, which restricts the
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