Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
draft-xie-lsr-isis-sr-vtn-mt-02
LSR Working Group C. Xie
Internet-Draft C. Ma
Intended status: Informational China Telecom
Expires: April 16, 2021 J. Dong
Z. Li
Huawei Technologies
October 13, 2020
Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual
Transport Network
draft-xie-lsr-isis-sr-vtn-mt-02
Abstract
Enhanced VPN (VPN+) as defined in I-D.ietf-teas-enhanced-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 network
which consists of a subset of the network topology and network
resources allocated from the underlay network. A VTN could be used
as the underlay for one or a group of VPN+ services.
I-D.dong-lsr-sr-enhanced-vpn defines the IGP extensions to build a
set of Segment Routing (SR) based VTNs. This document describes a
simplified mechanism to build the SR based VTNs using IS-IS Multi-
Topology together with other well-defined IS-IS extensions.
Status of This Memo
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This Internet-Draft will expire on April 16, 2021.
Xie, et al. Expires April 16, 2021 [Page 1]
Internet-Draft IS-IS MT for SR VTN October 2020
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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 . . . . . . . . . . . . . . . . . . . . . 5
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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