BGP-LS Extensions for Segment Routing based Enhanced VPN
draft-dong-idr-bgpls-sr-enhanced-vpn-02
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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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Dong, et al. Expires December 25, 2020 [Page 1]
Internet-Draft BGP-LS Extensions for SR VPN+ June 2020
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 25, 2020.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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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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