BGP-LS with Flex-Algo for Segment Routing based Virtual Transport Networks
draft-zhu-idr-bgpls-sr-vtn-flexalgo-00
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2020-03-09
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IDR Working Group Y. Zhu
Internet-Draft China Telecom
Intended status: Standards Track J. Dong
Expires: September 10, 2020 Z. Hu
Huawei Technologies
March 9, 2020
BGP-LS with Flex-Algo for Segment Routing based Virtual Transport
Networks
draft-zhu-idr-bgpls-sr-vtn-flexalgo-00
Abstract
Enhanced VPN (VPN+) as defined in I-D.ietf-teas-enhanced-vpn aims to
provide enhanced VPN service to support applications's needs of
enhanced isolation and stringent performance requirements. VPN+
requries integration between the overlay VPN and the underlay
network. A Virtual Transport Network (VTN) is a virtual network
which consists of a subset of the network toplogy and network
resources allocated from the underlay network. A VTN could be used
as the underlay for one or a group of VPN+ services.
I-D.dong-idr-bgpls-sr-enhanced-vpn defines the BGP-LS extensions to
distribute the information of Segment Routing (SR) based VTNs to
external entities, such as the network controllers. This document
describes a simplified mechanism to distribute the information of SR
based VTNs using BGP-LS with Flex-Algo.
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/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Zhu, et al. Expires September 10, 2020 [Page 1]
Internet-Draft BGP-LS Flex-Algo for SR VTN March 2020
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 September 10, 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
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Advertisement of VTN Topology Attribute . . . . . . . . . . . 3
2.1. Intra-domain Topology Advertisement . . . . . . . . . . . 3
2.2. Inter-Domain Topology Advertisement . . . . . . . . . . . 4
3. Advertisement of VTN Resource Attribute . . . . . . . . . . . 5
4. Scalability Considerations . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 7
8.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
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. These
properties cannot be met with pure overlay networks, as they require
integration between the underlay and the overlay networks.
[I-D.ietf-teas-enhanced-vpn] specifies the framework of enhanced VPN
and describes the candidate component technologies in different
network planes and layers. An enhanced VPN can be used for 5G
Zhu, et al. Expires September 10, 2020 [Page 2]
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