This object indicates the current fabric plane operational
status.
up - The plane is fully 'up' (i.e., the plane can pass
both unicast and multicast traffic).
down - The plane is fully 'down' (i.e., th plane can't
pass both unicast and multicast traffic).
mcastDown - The multicast state of the plane is 'down' (i.e.,
unicast traffic can pass though the plane but
multicast traffic can't).