Using Flex-Algo for Segment Routing based VTN
draft-zhu-lsr-isis-sr-vtn-flexalgo-01
LSR Working Group Y. Zhu
Internet-Draft China Telecom
Intended status: Standards Track J. Dong
Expires: March 15, 2021 Z. Hu
Huawei Technologies
September 11, 2020
Using Flex-Algo for Segment Routing based VTN
draft-zhu-lsr-isis-sr-vtn-flexalgo-01
Abstract
As defined in I-D.ietf-teas-enhanced-vpn, enhanced VPN (VPN+) aims to
provide enhanced VPN service to support the 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 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 mechanisms with
necessary extensions to build a set of Segment Routing (SR) based
VTNs. This document describes a simplified mechanism to build the SR
based VTNs using SR Flex-Algo together with minor extensions to IGP
L2 bundle.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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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Zhu, et al. Expires March 15, 2021 [Page 1]
Internet-Draft Flex-Algo for SR VTN September 2020
This Internet-Draft will expire on March 15, 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
4. Forwarding Plane Operations . . . . . . . . . . . . . . . . . 5
5. Scalability Considerations . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
9.1. Normative References . . . . . . . . . . . . . . . . . . 6
9.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
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
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