BGP-LS Extensions for Segment Routing based Enhanced VPN
draft-dong-idr-bgpls-sr-enhanced-vpn-03

Document Type Active Internet-Draft (individual)
Authors Jie Dong  , Zhibo Hu , Zhenbin Li  , Xiongyan Tang , Ran Pang 
Last updated 2021-02-22
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IDR Working Group                                                J. Dong
Internet-Draft                                                     Z. Hu
Intended status: Standards Track                                   Z. Li
Expires: August 26, 2021                             Huawei Technologies
                                                                 X. Tang
                                                                 R. Pang
                                                            China Unicom
                                                       February 22, 2021

        BGP-LS Extensions for Segment Routing based Enhanced VPN
                draft-dong-idr-bgpls-sr-enhanced-vpn-03

Abstract

   Enhanced VPN (VPN+) aims to provide enhanced VPN services to support
   some applications' needs of enhanced isolation and stringent
   performance requirements.  VPN+ requires integration between the
   overlay VPN connectivity and the characteristics provided by the
   underlay network.  A Virtual Transport Network (VTN) is a virtual
   underlay network which consists of a customized network topology and
   a set of network resource allocated from the physical network.  A VTN
   could be used as the underlay to support one 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 to a centralized network controller.  Each VTN can have a
   customized topology and a set of network resources allocated.
   Multiple VTNs may shared the same topology, and multiple VTNs may
   share the same set of network resources on some network segments.
   This allows flexible combination of network topology and network
   resource attributes to build a large number of VTNs with a relatively
   small number of logical topologies.  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.

Dong, et al.             Expires August 26, 2021                [Page 1]
Internet-Draft        BGP-LS Extensions for SR VPN+        February 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Advertisement of VTN Definition . . . . . . . . . . . . . . .   4
   3.  Advertisement of VTN Topology Attribute . . . . . . . . . . .   5
     3.1.  Intra-domain Topology Advertisement . . . . . . . . . . .   5
       3.1.1.  MTR based Topology Advertisement  . . . . . . . . . .   6
       3.1.2.  Flex-Algo based Topology Advertisement  . . . . . . .   7
     3.2.  Inter-Domain Topology Advertisement . . . . . . . . . . .   7
       3.2.1.  VTN ID TLV  . . . . . . . . . . . . . . . . . . . . .   9
   4.  Advertisement of VTN Resource Attribute . . . . . . . . . . .  10
     4.1.  Link Attribute Flags TLV  . . . . . . . . . . . . . . . .  10
   5.  Advertisement of VTN specific Data Plane Identifiers  . . . .  11
     5.1.  VTN-specific SR-MPLS SIDs . . . . . . . . . . . . . . . .  11
       5.1.1.  VTN-specific Prefix-SID TLV . . . . . . . . . . . . .  11
       5.1.2.  VTN-specific Adj-SID TLV  . . . . . . . . . . . . . .  12
     5.2.  VTN-specific SRv6 Locators  . . . . . . . . . . . . . . .  13
     5.3.  Dedicated VTN ID in Data Plane  . . . . . . . . . . . . .  14
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