Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN
draft-ietf-spring-sr-for-enhanced-vpn-00

Document Type Active Internet-Draft (spring WG)
Authors Jie Dong  , Stewart Bryant  , Takuya Miyasaka  , Yongqing Zhu  , Fengwei Qin  , Zhenqiang Li  , Francois Clad 
Last updated 2021-02-12
Replaces draft-dong-spring-sr-for-enhanced-vpn
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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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

Dong, et al.             Expires August 16, 2021                [Page 1]
Internet-Draft                 SR for VPN+                 February 2021

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 16, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
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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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