on - Flow control will be enabled on this interface according to the
IEEE 802.3x standard.
off - Flow control is disabled.
autoNegotiation - Flow control will be enabled or disabled on this
interface. If enabled, it will operate as specified
by the IEEE 802.3x standard.
enabledRx - Flow control will be enabled on this interface for
recieved frames.
enabledTx - Flow control will be enabled on this interface for
transmitted frames.
An attempt to set this object to 'enabledRx(4)' or 'enabledTx(5)'
will fail on interfaces that do not support operation
at greater than 100 Mb/s.
In any case, flow control can work only if swIfDuplexOperMode is
full.