The key standard in this area, the IEEE 802.3ah, focuses on the access link
(first/last mile) of native Ethernet access networks. Multiple transport solutions for
Ethernet can be employed, such as SONET, WDM, etc., and there are well-established
OAM standards for these respective solutions.
Standards Work Key standard bodies such as the ITU, MEF, and IEEE and their respective
standards/specifications are focused on developing OAM capabilities across
Carrier Ethernet 89
the three layers as shown in Table 2.7. Some of the key functions provided by the different
standards at each of the layers are also briefly discussed.
Some of these functions and standards are focused beyond a single layer (IEEE
802.1ag/Y.1731, for example, is applicable to both the service and connectivity layers).
Also, there are multiple standards in some of the layers. Generally, there is alignment
between the respective standards efforts such that they mutually reinforce each other
and do not conflict. Thus, both IEEE 802.1ag and ITU Y.1731 provide similar capabilities
to monitor the service end-to-end.
?– Discovery This function enables auto discovery and exchange of information
pertaining to OAM and other capabilities between peer entities in a network (or
on a link in the transport layer).
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