Metro Ethernet Overview
The speed, cost, and availability of Ethernet makes it an attractive transport service option for providers to offer to their customers. The Ethernet family of technologies operates at the following rates:10 Mbps (Ethernet)100 Mbps (Fast Ethernet)1000 Mbps (Gigabit Ethernet)10,000 Mbps (Ten Gigabit Ethernet)
The total price per bit per second is lower for Ethernet compared to other technologies, such as Packet over SONET (POS).Many providers already offer Ethernet connectivity to their customers; others are considering Ethernet, either as a Layer 2 transport technology or to invest in their existing SONET, Frame Relay, or ATM services with IP virtual private network (VPN) offerings. In both cases, providers must consider the means in which they can use Ethernet to better serve their customers.Metro Ethernet is a service to connect physically dispersed Ethernet LANs that belong to the same corporation. In the metro environment, you can use Ethernet in the following situations:To provide transparent LAN services (TLS) for customers' LAN connectivity to their remote sitesTo provide Layer 2 Ethernet VPNs that virtually unite geographically dispersed servers to appear as though they are located on the same LAN
Enterprises might be interested in Ethernet VPNs because of their ability to offer faster transport between campuses or a main campus and remote branches. This idea of joining geographically dispersed networks with Ethernet becomes possible because Ethernet VPNs are mimicking the way enterprises today might use their ATM, private line, or Frame Relay service. When Ethernet VPNs are involved, the enterprise is serviced with a high-bandwidth network connection at both ends of the network.Metro Ethernet deployments offer enterprise customers an effective metropolitan-area network (MAN) alternative to current WAN networks. The next sections detail some of the requirements that enterprises and providers impose on Metro Ethernet. |
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