The systems interpretation of the operational status of the
port.
up(1) - The state when the port is operationally up.
down(2) - The state when the port has any other
operational status other than 'up'.
testing(3) - The state when the system is retrieving the
status of the port.
notTracked(4) - The state when etsysTrackedObjectsPortGroupName
has its default value.