PLANET WGSW-50040 - Manual (Page 94)

3.1.4 flow control
Command:
flow control
no flow control
Function:
Enables the flow control function for the port: the “no flow control” command disables the flow
control function for the port.
Command mode:
Port Mode.
Default:
Port flow control is disabled by default.
Usage Guide:
After the flow control function is enabled, the port will notify the sending device to slow down the
sending speed to prevent packet loss when traffic received exceeds the capacity of port cache.
Ports support IEEE802.3X flow control; the ports work in half-duplex mode, supporting
back-pressure flow control. If flow control results in serious HOL, the switch will automatically start
HOL control (discarding some packets in the COS queue that may result in HOL) to prevent drastic
degradation of network performance.
Port flow control function is not recommended unless the users need a slow speed, low
performance network with low packet loss. Flow control will not work between different
cards in the switch. When enable the port flow control function, speed and duplex mode of
both ends should be the same.
Example:
Enabling the flow control function in ports1/1-8.
Switch(config)#interface ethernet 1/1-8
Switch(Config-Port-Range)#flow control
3.1.5 interface ethernet
Command:
interface ethernet <interface-list>
Function:
Enters Ethernet Port Mode from Global Mode.
Parameters:
<interface-list> stands for port number.