The status of an interface participating in Smart
link operation.
uninitialized (1) - A value of ' uninitialized '
indicates that, the interface
is not configured.
active(2) - A value of 'active' indicates that,
the interface is actively forwarding
traffic.
standby(3) - A value of 'standby' indicates that,
the interface is ready to forward
traffic if the active interface goes
down.
down(4) - A value of 'down' indicates that,
the interface is physically down.