The OAM functions supported on this Ethernet-like interface. OAM consists of separate functional sets beyond
the basic discovery process that is always required. These functional groups can be supported independently by
any implementation. These values are communicated to the peer via the local configuration field of Information
OAMPDUs.
Setting 'unidirectionalSupport(0)' indicates that the OA entity supports the transmission of OAMPDUs on links
that are operating in unidirectional mode (traffic flowing in one direction only).
Setting 'loopbackSupport(1)' indicates that the OAM entity can initiate and respond to loopback commands.
Setting 'eventSupport(2)' indicates that the OAM entity can send and receive Event Notification OAMPDUs.
Setting 'variableSupport(3)' indicates that the OAM entity can send and receive Variable Request and Response
OAMPDUs.