IBM NH2025-10 manual Setting the flow control, Get-fctrl, Set-fctrl

Configuring, Modifying, and Monitoring the Unit

Setting the flow control

Ports are compliant to flow control specifications 802.3x or back-pressure.

You can set a port to perform flow control only if this port is in full duplex mode otherwise back- pressure is applied to control the incoming flow of data.

When the port is configured to do 802.3z flow control the switching engine sends a continuous flow of idle frames to avoid dead locks.

If the port applies back-pressure the mechanism is slightly different in the sense that instead of sending idle frames the switching engine sends a collision signal.

get-fctrl

The get-fctrlcommand displays the status of the flow control function.

get-fctrl <database> <port-number>

opt.[arg #0] database type - either {runnvramall}; default : run

opt.[arg #1] port index in format <dport>;default: all get-fctrl nvram

SYS_console>get-fctrl ?

Example

	get-fctrl	gets the port	flow control request: enable or disable
	opt.[arg #0]	database type - either {runnvramall}; default : run
	opt.[arg #1]	port number -	1..25; default : all
	SYS_console>
set-fctrl

The set-fctrlcommand sets a port’s flow control mode.

SYS_console>set-fctrl ?

set-fctrl sets the port flow control: enable or disable

[arg #0] database type - either {runnvramall}

[arg #1] port number - 1..25

opt.[arg #2] enter either {enabledisable}; default : enable

29