Numerous MPLS-based VPN services developed in the last few years have resulted in a total confusion. When someone told you he’s using MPLS VPN services a few years ago, he was almost always using the “traditional” MPLS VPN services (described in my MPLS and VPN Architectures book). Today, he could be using (layer-3) MPLS VPN services, pseudowires or VPLS. To help you understand the various options, I’ve created a VPN services taxonomy document in the CT3 wiki. This document will give you an overview of both Service Provider-offered and self-created VPN solutions.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.