Summary
Pseudowire emulation is an emerging networking technology that aims at transitioning traditional Layer 2 services to much leveraged PSNs for operating cost reduction and new value-added services.Within the network reference model, PE devices are the key components that provide pseudowire emulation services. A PE device consists of the control plane that establishes and maintains pseudowires among PE devices and the data plane that converts frames from their native encapsulation to pseudowire encapsulation back and forth.This chapter outlined the pseudowire protocol and encapsulation layering. It further explained the various stages of processing in a pseudowire emulation system, such as signaling, native service, pseudowire encapsulation, and tunnel encapsulation.Even with the fast-growing deployment of pseudowire emulation, the standardization process is an ongoing effort. The IETF and its working groups are the most active and widely respected standardization organizations that develop frameworks and solutions for pseudowire emulation and Layer 2 VPN technology in general. This chapter compared the most debated proposals on pseudowire emulation architectures and highlighted other Layer 2 VPN architectures that are built on top of pseudowire emulation. |
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