The operational state of the port on which the
remote MEP is configured. This information is
derived from the port-state as indicated in the
CC message. The possible values are:
'up' - The port is operationally up.
'down' - The port is operationally (but not
administratively) down.
'adminDown' - The port is administratively down.
'test' - The port is in test mode (perhaps
due to an IEEE Standard 802.3ah OAM
intrusive loopback operation).
'remoteExcessiveErrors' - 802.3ah OAM reports that the other
end of the link is receiving an
excessive number of invalid frames.
'localExcessiveErrors' - 802.3ah OAM reports that this end of
the link is receiving an excessive
number of invalid frames.
'localNoData' - No data and no CFM messages have been
received for an excessive length of
time.