Network Working Group                                       L. Andersson
Request for Comments: 4026                                     T. Madsen
Category: Informational                                         Acreo AB
                                                              March 2005


     Provider Provisioned Virtual Private Network (VPN) Terminology

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

   The widespread interest in provider-provisioned Virtual Private
   Network (VPN) solutions lead to memos proposing different and
   overlapping solutions.  The IETF working groups (first Provider
   Provisioned VPNs and later Layer 2 VPNs and Layer 3 VPNs) have
   discussed these proposals and documented specifications.  This has
   lead to the development of a partially new set of concepts used to
   describe the set of VPN services.

   To a certain extent, more than one term covers the same concept, and
   sometimes the same term covers more than one concept.  This document
   seeks to make the terminology in the area clearer and more intuitive.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  PPVPN Terminology  . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Provider Provisioned Virtual Private Network Services  . . . .  4
       3.1.  Layer 3 VPN (L3VPN)  . . . . . . . . . . . . . . . . . .  4
       3.2.  Layer 2 VPN (L2VPN)  . . . . . . . . . . . . . . . . . .  4
       3.3.  Virtual Private LAN Service (VPLS) . . . . . . . . . . .  4
       3.4.  Virtual Private Wire Service (VPWS)  . . . . . . . . . .  4
       3.5.  IP-Only LAN-Like Service (IPLS)  . . . . . . . . . . . .  5
       3.6.  Pseudo Wire (PW) . . . . . . . . . . . . . . . . . . . .  5
       3.7.  Transparent LAN Service (TLS)  . . . . . . . . . . . . .  5
       3.8.  Virtual LAN (VLAN) . . . . . . . . . . . . . . . . . . .  6
       3.9.  Virtual Leased Line Service (VLLS) . . . . . . . . . . .  6
       3.10. Virtual Private Network (VPN)  . . . . . . . . . . . . .  6
       3.11. Virtual Private Switched Network (VPSN)  . . . . . . . .  6
   4.  Classification of VPNs . . . . . . . . . . . . . . . . . . . .  7
   5.  Building Blocks  . . . . . . . . . . . . . . . . . . . . . . .  8


            
               
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