Two types of modern Virtual Private Networks (VPNs), BGP/MPLS and IPSec are becoming increasingly attractive to network managers.
This 16 page white paper provides an overview of MPLS and then discusses the mechanisms used to provide VPNs based upon BGP/MPLS and IPSec.
This 19 page white paper via the Metro Ethernet Forum (MEF), provides a comprehensive technical overview of Ethernet services.
Metro Ethernet Services – A Technical Overview is intended to help buyers and users of Ethernet services understand the various types and characteristics of those services and also to help service providers clearly
Over the past few years, the Internet has experienced two major scaling issues as it has struggled to provide continuous and uninterrupted growth:
The exhaustion of IP version 4 (IPv4) address space
The need to route traffic between the ever increasing number of networks that comprise the Internet