Again, the expectation is generally that over time most services will be Ethernet-
or IP-based and that most customers will be connected to the service provider over
an Ethernet interface, yet carriers will continue to offer legacy Layer 1 and Layer 2
services for many years, and in many cases will wish to retire the platforms currently
deployed to offer such services (often those platforms have already reached their end of
life) and migrate those services onto the next-generation networks currently being deployed
to offer IP and Ethernet services. Since MPLS pseudowires are the technology of
choice for legacy service migration and since MPLS-based IP VPNs are the technology
of choice for IP services, a carrier wishing to offer all services over a common platform
is most likely to select EoMPLS for Ethernet services.
Inter-provider Handoffs Are Required
Ultimately, no service provider is able to offer services in every location, and so providers
look to extend their footprint by partnering with others. For providers of Ethernet
services, the simplest way to interconnect with other networks is the ???back-to-back
UNI??? method??”typically just interconnecting a pair of GigE ports between providers
and provisioning a new VLAN for each inter-provider service instance.
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