Providing the
capability to detect, troubleshoot, and proactively manage any issues emerging at this
layer essentially means providing the ability to sectionalize any segment in the network
quickly; thus an issue can be narrowed to a specific point in the infrastructure
and quickly homed in on. Any issues at this layer will invariably have an impact on
the higher service layer, and the specific impact (i.e., which service instances have been
affected) on the management infrastructure needs to be identified. The IEEE 802.1ag
and Y.1731 standards focus on this layer.
Transport/Data-Link Layer At the Data-Link layer, the OAM is focused on providing
the capability to manage a single physical data link between two Ethernet interfaces;
such links, of course, make up the network infrastructure, but the OAM capabilities
on this layer are restricted to only individual physical links and include the ability
to troubleshoot any issues employing loopbacks and monitor performance effectively.
Any impact on this layer manifests in possible issues at the higher (connectivity and
service) layers, and robust capabilities to monitor, troubleshoot, and identify any issues
are vital.
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