Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-dong-spring-sr-for-enhanced-vpn-12
SPRING Working Group J. Dong
Internet-Draft Huawei Technologies
Intended status: Informational S. Bryant
Expires: June 6, 2021 Futurewei Technologies
T. Miyasaka
KDDI Corporation
Y. Zhu
China Telecom
F. Qin
Z. Li
China Mobile
F. Clad
Cisco Systems
December 3, 2020
Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-dong-spring-sr-for-enhanced-vpn-12
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 network
resources allocated for executing the instruction. Such a segment is
called resource-aware SID.
Resource-aware SIDs may be used to build SR paths with a set of
reserved network resources. In addition, resource-aware SIDs may be
used to build SR based virtual underlay networks, which can provide
the customized network topology and resource attributes required by
different customers and/or services. Such virtual networks are
called SR based Virtual Transport Networks (VTNs). The SR based VTNs
can be used as the underlay network to enable services with required
topology and resource characteristics. This document describes a
suggested use of resource-aware SIDs to build SR based VTNs.
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Dong, et al. Expires June 6, 2021 [Page 1]
Internet-Draft SR for VPN+ December 2020
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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. Scalability Considerations . . . . . . . . . . . . . . . 4
3. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. VTN Topology and Resource Planning . . . . . . . . . . . 5
3.2. VTN Network Resource and SID Allocation . . . . . . . . . 6
3.3. Construction of SR based VTNs . . . . . . . . . . . . . . 8
3.4. Mapping Service to SR based VTN . . . . . . . . . . . . . 9
3.5. VTN Visibility to Customer . . . . . . . . . . . . . . . 10
4. Characteristics of SR based VTN . . . . . . . . . . . . . . . 10
5. Service Assurance of VTN . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 12
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
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