BGP-LS extend for inter-AS topology retrieval
draft-wang-idr-bgpls-inter-as-topology-ext-00

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Document Type Active Internet-Draft (individual)
Author Aijun Wang 
Last updated 2018-03-05
Replaced by draft-ietf-idr-bgpls-inter-as-topology-ext
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TEAS Working Group                                             A.Wang
Internet Draft                                           China Telecom

Intended status: Standard Track                           March 5, 2018
Expires: September 4, 2018

               BGP-LS extend for inter-AS topology retrieval
             draft-wang-idr-bgpls-inter-as-topology-ext-00.txt

Status of this Memo

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   This Internet-Draft will expire on August 31, 2018.

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Abstract

   This document describes new TLVs extended for BGP-LS to transfer the
   originator of redistributed routes and other inter-AS TE related
   TLVs to let the SDN controller to retrieve the network topology
   automatically under the multi-domain environments.

   This extension can expand the usage of BGP-LS protocol to multi-
   domain; enable the network operator to collect the connection
   relationship between different domains and then calculate the
   overall network topology automatically based on the information
   provided by BGP-LS protocol.

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Table of Contents

   1. Introduction ................................................ 2
   2. Conventions used in this document............................ 3
   3. Multi-Domain Scenarios....................................... 3
      3.1. IS-IS/OSPF Native IP Scenario............................ 4
      3.2. IS-IS/OSPF inter-AS TE Scenario ......................... 4
      3.3. Proposed Solution........................................ 5
         3.3.1. Redistributed Routes Originator TLV ................ 5
         3.3.2. Inter-AS TE related TLVs............................ 6
         3.3.3. Topology Reconstruction............................. 6
   4. Security Considerations....................................... 6
   5. IANA Considerations .......................................... 6
   6. Conclusions .................................................. 7
   7. References ................................................... 7
      7.1. Normative References..................................... 7
      7.2. Informative References .................................. 7
   8. Acknowledgments ............................................. 8

1. Introduction

   BGP-LS [RFC 7752] 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 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.

   Draft[I-D.ietf-idr-bgpls-segment-routing-ext]defines some extensions
   for exporting segment routing related information. It proposes one
   "Source Router Identifier" TLV which is defined in [RFC7794] to
   transfer the originator information of redistributed prefixes. But

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