BGP-LS Extensions for Segment Routing based Enhanced VPN
draft-dong-idr-bgpls-sr-enhanced-vpn-02

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Last updated 2020-06-23
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IDR Working Group                                                J. Dong
Internet-Draft                                                     Z. Hu
Intended status: Standards Track                                   Z. Li
Expires: December 25, 2020                           Huawei Technologies
                                                                 X. Tang
                                                                 R. Pang
                                                            China Unicom
                                                           June 23, 2020

        BGP-LS Extensions for Segment Routing based Enhanced VPN
                draft-dong-idr-bgpls-sr-enhanced-vpn-02

Abstract

   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.  An enhanced
   VPN may be used for 5G transport network slicing, and will also be of
   use in more generic scenarios.  To meet the requirement of enhanced
   VPN services, a number of Virtual Transport Networks (VTNs) need to
   be created, each with a subset of the underlay network topology and a
   set of network resources allocated to meet the requirement of a
   specific VPN+ service, or a group of VPN+ services.

   This document specifies the BGP-LS mechanisms with necessary
   extensions to advertise the information of Segment Routing (SR) based
   VTNs.  The proposed mechanism is applicable to both segment routing
   with MPLS data plane (SR-MPLS) and segment routing with IPv6 data
   plane (SRv6).

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.

   Internet-Drafts are working documents of the Internet Engineering
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Dong, et al.            Expires December 25, 2020               [Page 1]
Internet-Draft        BGP-LS Extensions for SR VPN+            June 2020

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   This Internet-Draft will expire on December 25, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Advertisement of VTN Definition . . . . . . . . . . . . . . .   3
   3.  Advertisement of VTN Topology Attribute . . . . . . . . . . .   5
     3.1.  Intra-domain Topology Advertisement . . . . . . . . . . .   5
       3.1.1.  MTR based Topology Advertisement  . . . . . . . . . .   5
       3.1.2.  Flex-Algo based Topology Advertisement  . . . . . . .   6
     3.2.  Inter-Domain Topology Advertisement . . . . . . . . . . .   6
       3.2.1.  VTN ID TLV  . . . . . . . . . . . . . . . . . . . . .   8
   4.  Advertisement of VTN Resource Attribute . . . . . . . . . . .   9
     4.1.  Link Attribute Flags TLV  . . . . . . . . . . . . . . . .   9
   5.  Advertisement of VTN specific Data Plane Identifiers  . . . .  10
     5.1.  VTN-specific SIDs for SR-MPLS . . . . . . . . . . . . . .  10
       5.1.1.  VTN-specific Prefix-SID TLV . . . . . . . . . . . . .  10
       5.1.2.  VTN specific Adj-SID TLV  . . . . . . . . . . . . . .  11
     5.2.  VTN-specific Locators for SRv6  . . . . . . . . . . . . .  12
     5.3.  Dedicated VTN ID in Data Plane  . . . . . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
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