The current operational state of this VPLS Service.
A value of up(1) indicates that all pseudo-wires for this
vpls are up and the attachment circuit is up.
A value of degraded(2) indicates that at least one
pseudo-wires for this vpls is up and the attachment circuit
is up.
A value of down(3) indicates that all pseudo-wires for this
vpls are down or the attachment circuit is down.