The operational status of OAM for the interface identified by this
entry.
oamOperStatusNotSupported(0) - OAM not supported on this interface
oamOperStatusDisabled(1) - VC integrity disabled
oamOperStatusSent(2) - Loopback sent, awaiting response
oamOperStatusReceived(3) - Loopback response received, awaiting
frequency
oamOperStatusFailed(4) - Loopback response not received, or
invalid response received