MPLS VPN Terminology
Since the early days of X.25 and Frame Relay (the two technologies initially used to deploy VPN services), many different technologies have been proposed as the basis to enable a VPN infrastructure. These ranged from Layer 2 technologies (X.25, Frame Relay, and Asynchronous Transfer Mode [ATM]) to Layer 3 technologies (primarily IP) or even Layer 7 technologies. IBM once had a product that transported IP datagrams over Systems Network Architecture (SNA) application sessions, and TGV (a company later acquired by Cisco Systems) had implemented IP transport over DECnet sessions. Not surprisingly, with such a variety of implementation proposals, the overall terminology in the field has changed dramatically. This book uses the ...
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