BGP-LS Extension for Inter-AS Topology Retrieval
draft-ietf-idr-bgpls-inter-as-topology-ext-00

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Last updated 2018-11-05 (latest revision 2018-10-21)
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 24, 2019                              Huawei Technologies
                                                        October 21, 2018

            BGP-LS Extension for Inter-AS Topology Retrieval
             draft-ietf-idr-bgpls-inter-as-topology-ext-00

Abstract

   This document describes the process to build BGP-LS key parameters in
   Native IP multi-domain scenario and defines 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 expand the usage of BGP-LS protocol to
   multi- domain, enable the network operator to collect the connection
   relationship between different AS 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
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   This Internet-Draft will expire on April 24, 2019.

Copyright Notice

   Copyright (c) 2018 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

Wang & Chen              Expires April 24, 2019                 [Page 1]
Internet-Draft             BGP-LS-Inter-AS-Ext              October 2018

   publication of this document.  Please review these documents
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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
     3.1.  IS-IS/OSPF Inter-AS Native IP Scenario  . . . . . . . . .   3
     3.2.  IS-IS/OSPF Inter-AS TE Scenario . . . . . . . . . . . . .   4
   4.  Inter-AS TE related TLVs  . . . . . . . . . . . . . . . . . .   5
     4.1.  Remote AS Number TLV  . . . . . . . . . . . . . . . . . .   5
     4.2.  IPv4 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   6
     4.3.  IPv6 Remote ASBR ID . . . . . . . . . . . . . . . . . . .   6
   5.  Topology Reconstruction.  . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

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 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 to collect
   this information and report them to the PCE/SDN controller, which
   restricts the deployment flexibility of BGP-LS protocol.

   This draft analysizes the situations that the PCE/SDN controller
   needs to get about the inter-connected information between different
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