Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
draft-xie-lsr-isis-sr-vtn-mt-03
LSR Working Group C. Xie
Internet-Draft C. Ma
Intended status: Informational China Telecom
Expires: August 26, 2021 J. Dong
Z. Li
Huawei Technologies
February 22, 2021
Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual
Transport Network
draft-xie-lsr-isis-sr-vtn-mt-03
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 the underlay network. A Virtual Transport Network
(VTN) is a virtual underlay network which consists of a subset of the
network topology and network resources allocated from the physical
network. A VTN could be used as the underlay for one or a group of
VPN+ services.
In some network scenarios, each VTN can be associated with a unique
logicial network topology. This document describes a mechanism to
build the SR based VTNs using IS-IS Multi-Topology together with
other well-defined IS-IS extensions.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 26, 2021.
Xie, et al. Expires August 26, 2021 [Page 1]
Internet-Draft IS-IS MT for SR VTN February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Advertisement of SR VTN Topology Attribute . . . . . . . . . 3
3. Advertisement of SR VTN Resource Attribute . . . . . . . . . 4
3.1. Advertising Topology-specific TE attributes . . . . . . . 4
4. Forwarding Plane Operations . . . . . . . . . . . . . . . . . 5
5. Scalability Considerations . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
9.1. Normative References . . . . . . . . . . . . . . . . . . 6
9.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
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 underlay and the overlay
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 may be used for
5G transport network slicing, and will also be of use in other
generic scenarios.
To meet the requirement of enhanced VPN services, a number of virtual
transport networks (VTN) can be created, each with a subset of the
underlay network topology and a subset of network resources allocated
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