A Framework for Layer 3 Provider-Provisioned Virtual Private Networks (PPVPNs)
RFC 4110
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RFC - Informational
(July 2005; No errata)
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Last updated |
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2015-10-14
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IETF
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plain text
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htmlized
bibtex
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(None)
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Document shepherd |
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No shepherd assigned
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| IESG |
IESG state |
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RFC 4110 (Informational)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Alex Zinin
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Send notices to |
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<rick@rhwilder.net>, <ronald.p.bonica@mci.com>
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Network Working Group R. Callon
Request for Comments: 4110 Juniper Networks
Category: Informational M. Suzuki
NTT Corporation
July 2005
A Framework for Layer 3
Provider-Provisioned Virtual Private Networks (PPVPNs)
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document provides a framework for Layer 3 Provider-Provisioned
Virtual Private Networks (PPVPNs). This framework is intended to aid
in the standardization of protocols and mechanisms for support of
layer 3 PPVPNs. It is the intent of this document to produce a
coherent description of the significant technical issues that are
important in the design of layer 3 PPVPN solutions. Selection of
specific approaches, making choices regarding engineering tradeoffs,
and detailed protocol specification, are outside of the scope of this
framework document.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Objectives of the Document . . . . . . . . . . . . . . . 3
1.2. Overview of Virtual Private Networks . . . . . . . . . . 4
1.3. Types of VPNs. . . . . . . . . . . . . . . . . . . . . . 7
1.3.1. CE- vs PE-based VPNs . . . . . . . . . . . . . . 8
1.3.2. Types of PE-based VPNs . . . . . . . . . . . . . 9
1.3.3. Layer 3 PE-based VPNs. . . . . . . . . . . . . . 10
1.4. Scope of the Document. . . . . . . . . . . . . . . . . . 10
1.5. Terminology. . . . . . . . . . . . . . . . . . . . . . . 11
1.6. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . 13
2. Reference Models . . . . . . . . . . . . . . . . . . . . . . . 14
2.1. Reference Model for Layer 3 PE-based VPN . . . . . . . . 14
2.1.1. Entities in the Reference Model. . . . . . . . . 16
2.1.2. Relationship Between CE and PE . . . . . . . . . 18
Callon & Suzuki Informational [Page 1]
RFC 4110 A Framework for L3 PPVPNs July 2005
2.1.3. Interworking Model . . . . . . . . . . . . . . . 19
2.2. Reference Model for Layer 3 Provider-Provisioned
CE-based VPN . . . . . . . . . . . . . . . . . . . . . . 21
2.2.1. Entities in the Reference Model. . . . . . . . . 22
3. Customer Interface . . . . . . . . . . . . . . . . . . . . . . 23
3.1. VPN Establishment at the Customer Interface. . . . . . . 23
3.1.1. Layer 3 PE-based VPN . . . . . . . . . . . . . . 23
3.1.1.1. Static Binding . . . . . . . . . . . . 24
3.1.1.2. Dynamic Binding. . . . . . . . . . . . 24
3.1.2. Layer 3 Provider-Provisioned CE-based VPN. . . . 25
3.2. Data Exchange at the Customer Interface. . . . . . . . . 25
3.2.1. Layer 3 PE-based VPN . . . . . . . . . . . . . . 25
3.2.2. Layer 3 Provider-Provisioned CE-based VPN. . . . 26
3.3. Customer Visible Routing . . . . . . . . . . . . . . . . 26
3.3.1. Customer View of Routing for Layer 3 PE-based
VPNs . . . . . . . . . . . . . . . . . . . . . . 26
3.3.1.1. Routing for Intranets . . . . . . . . 27
3.3.1.2. Routing for Extranets . . . . . . . . 28
3.3.1.3. CE and PE Devices for Layer 3
PE-based VPNs. . . . . . . . . . . . . 29
3.3.2. Customer View of Routing for Layer 3 Provider-
Provisioned CE-based VPNs. . . . . . . . . . . . 29
3.3.3. Options for Customer Visible Routing . . . . . . 30
4. Network Interface and SP Support of VPNs . . . . . . . . . . . 32
4.1. Functional Components of a VPN . . . . . . . . . . . . . 32
4.2. VPN Establishment and Maintenance. . . . . . . . . . . . 34
4.2.1. VPN Discovery . . . . . . . . . . . . . . . . . 35
4.2.1.1. Network Management for Membership
Information. . . . . . . . . . . . . . 35
4.2.1.2. Directory Servers. . . . . . . . . . . 36
4.2.1.3. Augmented Routing for Membership
Information. . . . . . . . . . . . . . 36
4.2.1.4. VPN Discovery for Inter-SP VPNs. . . . 37
4.2.2. Constraining Distribution of VPN Routing
Information . . . . . . . . . . . . . . . . . . 38
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