Specifies the flow control type, which can be one of the following:
None (no flow control)
Receive (only receive flow control frames)
Send (only send flow control frames)
Full (send and receive flow control frames)
If the flow control option is not specified, the default value is interface-dependent:
If the link partner is configured for autonegotiation, the interface negotiates flow control by advertising its flow control setting. The actual operational value may be different, depending on the capabilities that each partner advertises.
If the link partner is not configured for autonegotiation, then the interface sends or accepts flow control frames as dictated by the flow control option or the default value.
Gigabit Ethernet and 100/1000 Ethernet interfaces operating at 1000 Mbps, with the exception of the first Gigabit Ethernet Controller, support flow control as described above, and their default flow control setting is "Full".
On 100/1000 Mbps interfaces operating at 100 Mbps, the system might override the configured setting with "Receive" or "None" because most 100 Mbps devices don't support flow control. In 100 Mbps half-duplex mode, the system always disables flow control.