When connecting across the wide
area, a better model is often to place a routing device at the boundary between the
WAN and LAN. Of course, this is also possible with EoMPLS if the customer connects
a router to the EoMPLS service (whether that is an E-Line service over pseudowires or
an E-LAN service over VPLS).
Benefits and Shortcomings
We will now discuss the benefits of the Ethernet over MPLS technology, as well as some
of its shortcomings.
MPLS 457
The benefits of any service technology may be looked at in terms of the quality of the
service the technology enables (the benefit to the customer of the service), but also in
terms of its capital and operational savings (the benefit to the provider of the service).
We will now look at some specific benefits of Ethernet over MPLS technology??”spanning
these two areas.
Benefits of Ethernet over MPLS
Enabling Carrier-Class Ethernet Layer 2 Ethernet switching doesn??™t scale (for the reasons
discussed previously in ???Drivers for This Solution???) and doesn??™t offer carrier-class
protection switching or per-flow QoS. Providers offering Ethernet services need to be
able to offer large numbers of service instances and generally want to offer Service-
Level Agreements that mirror those offered for other services (such as ATM or Frame
Relay).
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