Basically, the entire configuration for a specific service is downloaded into the CPE
from the provider edge device using E-LMI. Specifically, the E-LMI provides the following
capabilities to a Service Provider:
?– Add or delete an Ethernet Virtual Circuit (i.e., an Ethernet service instance) in
the CPE.
?– Inform the status of an already configured EVC, specifically whether it is available
or not.
?– Verify the integrity of the link between the Provider Edge (PE) and the CPE.
?– Ensure that the UNI and EVC attributes are correctly passed to the CPE.
Carrier Ethernet: Field Realities
While Carrier Ethernet is being embraced quite aggressively??”evident by the number
of Service Providers offering these services and also by the promising growth predicted,
it is important to note that it (Carrier Ethernet) still accounts for a relatively small
portion of the addressable market. In fact, a study by the Vertical Systems Group (VSG)
indicates that it makes up less than 5 percent of business service spending on telecom
services.
As Carrier Ethernet services are beginning to grow, they will invariably have to address
the Small and Medium Enterprises (SME) that make up the larger part of the
enterprise market opportunity and are represented graphically by the lower part of
the pyramid in Figure 2.
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