BGP SPF for Virtual Transport Network (VTN)
draft-dong-lsvr-bgp-spf-vtn-00
LSVR Working Group J. Dong
Internet-Draft Z. Li
Intended status: Standards Track H. Wang
Expires: August 26, 2021 Huawei Technologies
February 22, 2021
BGP SPF for Virtual Transport Network (VTN)
draft-dong-lsvr-bgp-spf-vtn-00
Abstract
A Virtual Transport Network (VTN) is a virtual underlay network which
consists of a customized network topology and a set of network
resource allocated from the physical network. In a network, multiple
VTNs can be created to meet different service requirements, and
services may be mapped to the same or different VTNs.
In networks where BGP Shortest Path First (SPF) is used to distribute
the link-state information among network nodes, the information of
VTNs needs to be distributed along with the basic network
information. This document specifies the BGP SPF mechanisms with
necessary extensions to distribute the VTN information and perform
VTN-specific path computaton.
Status of This Memo
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This Internet-Draft will expire on August 26, 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Internet-Draft BGP SPF for VTN February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Applicability of VTN related BGP-LS Extensions to BGP SPF . . 3
2.1. Reuse of BGP-LS TLVs for BGP SPF VTN . . . . . . . . . . 3
2.2. VTN Topology and Resource Distribution . . . . . . . . . 5
3. SPF Calculation for VTNs . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
The concept of Virtual Transport Network (VTN) is introduced in
[I-D.ietf-teas-enhanced-vpn]. A VTN is a virtual underlay network
which has customized network topology and a set of dedicated or
shared network resources. In a network, different VTNs may be
created to meet different service requirements, and services can be
mapped to the same or different VTNs.
[I-D.ietf-spring-sr-for-enhanced-vpn] describes the use of resource-
aware segments [I-D.ietf-spring-resource-aware-segments] to build SR
based VTNs. The SIDs of each VTN and the associated topology and
resource attributes need to be distributed using the control plane.
[I-D.dong-lsr-sr-enhanced-vpn] specifies the IGP mechanism and
extensions to build a set of SR based VTNs.
[I-D.dong-idr-bgpls-sr-enhanced-vpn] further specifies the BGP-LS
mechanisms and extensions to advertise the VTN information in each
domain and the VTN information on the inter-domain links to the
network controller, so that the controller could use the collected
information to build the inter-domain SR VTNs.
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