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