20
As Carrier Ethernet is accelerating as a Carrier-class service delivered over multiple
large and complex Service Provider networks, its OAM capabilities have to offer sophisticated
tools to provision individual Ethernet services, monitor their performance, and
identify and manage any issues quickly across such network topologies. Ultimately, this
will lead to reducing the total cost of ownership, which is a prerequisite before Carrier
Ethernet can meaningfully attempt to become a mass market service.
In attempting to define a comprehensive OAM capability for Carrier Ethernet, a layered
approach is conceptually employed21 to align with the layered nature of Service
Provider networks used to deliver Carrier Ethernet. Each of the OAM layers delineate
the different focus and functionality of the respective layer in the context of delivering
Carrier Ethernet. This is shown in Figure 2.20. The three-layered OAM approach
focuses on the service layer, the network/connectivity layer, and the transport/data-link
layer. The OAM at each of the layers is independent of the other layers; however, they
all employ standard Ethernet frames as the means of OAM-related communication.
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