Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-dong-spring-sr-for-enhanced-vpn-11
SPRING Working Group J. Dong
Internet-Draft Huawei Technologies
Intended status: Informational S. Bryant
Expires: May 6, 2021 Futurewei Technologies
T. Miyasaka
KDDI Corporation
Y. Zhu
China Telecom
F. Qin
Z. Li
China Mobile
F. Clad
Cisco Systems
November 2, 2020
Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-dong-spring-sr-for-enhanced-vpn-11
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.
The resource-aware SIDs can be used to build SR paths with a set of
reserved network resources. In addition, the resource-aware SIDs can
be used to build SR based virtual networks, which can provide the
customized network topology and resource attributes required by
different customers or services. Such virtual networks are called SR
based Virtual Transport Networks (VTNs). The SR based VTNs can be
used to enable the enhanced VPN (VPN+) services. This document
describes the mechanisms of using resource-aware SIDs to build SR
based VTNs.
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Dong, et al. Expires May 6, 2021 [Page 1]
Internet-Draft SR for VPN+ November 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
3. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. VTN Topology and Resource Planning . . . . . . . . . . . 6
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 . . . . . . . . . . . . . 10
3.5. VTN Visibility to Customer . . . . . . . . . . . . . . . 10
4. Benefits of the Proposed Mechanism . . . . . . . . . . . . . 10
5. Service Assurance . . . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 12
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
10.1. Normative References . . . . . . . . . . . . . . . . . . 12
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