Flow Control 83Flow Control The flow control mode allows a Fast Ethernet or Gigabit Ethernet port to:n Decrease the frequency with which it sends packets to a receivingdevice, if packets are being sent too rapidly.n Send flow control packets to a sending device, to request that thedevice slow its speed of transmission.ImportantConsiderationsTable 8 lists the effects of flow control options.n You can use this command to configure the same setting on multipleports simultaneously. When you specify multiple port numbers, thesystem prompts you to choose the setting and then applies it to all ofthe ports.n The default setting for flow control is off.n The system does not count flow control packets in receive or transmitstatistics.Table 8 Flow Control OptionsFlow ControlOption DescriptionAvailable onPort Typeon Port recognizes flow control packets andresponds by pausing transmission. The port cangenerate flow control packets as necessary toslow incoming traffic.Gigabit EthernetFast Ethernetoff Port ignores flow control packets and does notgenerate flow control packets.Gigabit EthernetFast EthernetrxOn Port recognizes flow control packets andresponds by halting transmission. The portdoes not generate flow control packets.Gigabit EthernettxOn Port ignores flow control packets, but it cangenerate flow control packets, if necessary.Gigabit Ethernet
