?– Metro Ethernet: The emergence of Metro Ethernet as a viable method of providing
both point-to-point and multipoint services has been driven by an abundance of new
?¬?ber deployment to business areas. Enterprise customers with years of Ethernet
experience in the campus have developed such a comfort level and con?¬?dence with
Ethernet that they are now asking their service providers for Ethernet as an access
option. Ethernet might be the most scalable transport technology ever developed.
Starting at 10 Mbps, it has now evolved to 10 Gbps, with plans for 40 Gbps. Several
prominent methods exist for transporting Ethernet over Metro networks, including
these key solution approaches:
??” Delivering Ethernet services over dark ?¬?ber
??” Delivering Ethernet services over SONET/Synchronous Digital
Hierarchy (SDH) networks
??” Delivering Ethernet services that use Resilient Packet Ring (RPR)
technology
Overview of PPP
Developers designed PPP to make the connection for point-to-point links. PPP, described
in RFC 1661, encapsulates network layer protocol information over point-to-point links.
RFC 1661 is updated by RFC 2153, ???PPP Vendor Extensions.
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