Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-ietf-spring-sr-for-enhanced-vpn-00
SPRING Working Group J. Dong
Internet-Draft Huawei Technologies
Intended status: Informational S. Bryant
Expires: August 16, 2021 Futurewei Technologies
T. Miyasaka
KDDI Corporation
Y. Zhu
China Telecom
F. Qin
Z. Li
China Mobile
F. Clad
Cisco Systems
February 12, 2021
Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-ietf-spring-sr-for-enhanced-vpn-00
Abstract
Segment Routing (SR) leverages the source routing paradigm. A node
steers a packet through an ordered list of instructions, called
"segments". A segment can represent topological or service based
instructions. A segment can further be associated with a set of
network resources used for executing the instruction. Such a segment
is called resource-aware segment.
Resource-aware Segment Identifiers (SIDs) may be used to build SR
paths with a set of reserved network resources. In addition, a group
of resource-aware SIDs may be used to build SR based virtual underlay
networks, which has customized network topology and resource
attributes required by one or a group of customers and/or services.
Such virtual networks are the SR instantiations of Virtual Transport
Networks (VTNs).
This document describes a suggested use of resource-aware SIDs to
build SR based VTNs.
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Dong, et al. Expires August 16, 2021 [Page 1]
Internet-Draft SR for VPN+ February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Resource-Aware SIDs for VTN . . . . . . . . . . . . . . . . . 3
2.1. SR-MPLS based VTN . . . . . . . . . . . . . . . . . . . . 4
2.2. SRv6 based VTN . . . . . . . . . . . . . . . . . . . . . 4
2.3. VTN Identification . . . . . . . . . . . . . . . . . . . 5
2.4. Scalability Considerations . . . . . . . . . . . . . . . 5
3. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. VTN Topology and Resource Planning . . . . . . . . . . . 6
3.2. VTN Network Resource and SID Allocation . . . . . . . . . 7
3.3. Construction of SR based VTNs . . . . . . . . . . . . . . 9
3.4. Mapping Service to SR based VTN . . . . . . . . . . . . . 11
3.5. VTN Visibility to Customer . . . . . . . . . . . . . . . 11
4. Characteristics of SR based VTN . . . . . . . . . . . . . . . 12
5. Service Assurance of VTN . . . . . . . . . . . . . . . . . . 13
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
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