BGP-LS with Flex-Algo for Segment Routing based Virtual Transport Networks
draft-zhu-idr-bgpls-sr-vtn-flexalgo-01
IDR Working Group Y. Zhu
Internet-Draft China Telecom
Intended status: Standards Track J. Dong
Expires: August 26, 2021 Z. Hu
Huawei Technologies
February 22, 2021
BGP-LS with Flex-Algo for Segment Routing based Virtual Transport
Networks
draft-zhu-idr-bgpls-sr-vtn-flexalgo-01
Abstract
Enhanced VPN (VPN+) aims to provide enhanced VPN service to support
some application's needs of enhanced isolation and stringent
performance requirements. VPN+ requires integration between the
overlay VPN and a particular set of resources in the underlay
network. A Virtual Transport Network (VTN) is a virtual underlay
network which has a customized network topology and a set of network
resources allocated from the physical network. A VTN could be used
to support one or a group of VPN+ services.
When Segment Routing is used as the data plane to provide VTNs, each
VTN can be allocated with a group of SIDs to identify the topology
and resource attributes of network segments in the VTN. The
association between the network topology, the network resource
attributes and the SR SIDs may need to be distributed to a
centralized network controller. For network scenarios where each VTN
can be identified by a unique Flex-Algo ID, this document describes a
mechanism to distribute the information of SR based VTNs using BGP-LS
with Flex-Algo.
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Zhu, et al. Expires August 26, 2021 [Page 1]
Internet-Draft BGP-LS Flex-Algo for SR VTN February 2021
This Internet-Draft will expire on August 26, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Advertisement of VTN Topology Attribute . . . . . . . . . . . 3
2.1. Intra-domain Topology Advertisement . . . . . . . . . . . 4
2.2. Inter-Domain Topology Advertisement . . . . . . . . . . . 4
3. Advertisement of VTN Resource Attribute . . . . . . . . . . . 6
4. Scalability Considerations . . . . . . . . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
Enhanced VPN (VPN+) is an enhancement to VPN services to support the
needs of new applications, particularly including the applications
that are associated with 5G services. These applications require
enhanced isolation and have more stringent performance requirements
than that can be provided with traditional overlay VPNs. Thus these
properties require integration between the overlay VPN and the
underlay networks. [I-D.ietf-teas-enhanced-vpn] specifies the
framework of enhanced VPN and describes the candidate component
technologies in different network planes and layers. An enhanced VPN
can be used for 5G network slicing, and will also be of use in other
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