BGP-LS Extension for Inter-AS Topology Retrieval
draft-ietf-idr-bgpls-inter-as-topology-ext-03
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.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
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
Show full document text