Chapter 3. Layer 2 VPN Architectures
This chapter covers the following topics:
• Legacy Layer 2 virtual private network (VPN)
• Any Transport over MPLS (AToM)
• Layer 2 Tunnel Protocol version 3 (L2TPv3)
The previous chapter highlighted different Layer 2 VPN architectures proposed by the network industry and Internet Engineering Task Force (IETF) working groups. In the past few years, significant progress has been made both in designing the Layer 2 VPN protocol specifications and realizing such innovations in a suite of new products. Pseudowire emulation serves as the fundamental building block for different Layer 2 VPN architectures.
A handful of network equipment vendors have developed products that support various levels of pseudowire emulation. ...
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