3Com 6000 manual To apply IFM to a half-duplexFast Ethernet port

14COREBUILDER 6000 INTELLIGENT SWITCHING SOFTWARE REVISION 8.2.0

5Enter full to set the port to full-duplex mode or half to set the port to half-duplex mode.

Default The port’s current setting is indicated within square brackets. To select this default, press [Return]. This action leaves the port unchanged.

6Repeat steps 4 and 5 to configure all the selected ports in all the selected slots.

Top-Level Menu
system
➧ethernet	summary
fddi
	detail	s
tokenring	➧fastEthernet	duplexMode	1
		➧ifm
bridge
	label
ip
	portState
snmp
analyzer
script
logout

Changing the mode to full-duplex disables collision detection on these ports.

Intelligent Flow Management (IFM). Intelligent flow management (IFM) is a congestion control mechanism built into the CoreBuilder system. You should implement IFM on any Fast Ethernet port that has a high volume of traffic. By default, IFM is enabled on CoreBuilder module ports.

Congestion is caused when one or more devices send traffic to an already congested port. If the port is connected to another CoreBuilder system or to an end-station, IFM minimizes packet loss and inhibits the sending device from generating more packets until the period of congestion ends.

Intelligent flow management is supported only on half-duplex ports. It is automatically disabled when a port is configured for full-duplex. 3Com recommends disabling IFM on network segments connected to repeaters.

To apply IFM to a half-duplex Fast Ethernet port:

From the top level of the Administration Console, enter:

ethernet fastEthernet ifm

You receive a prompt similar to the following:

Select slot(s) (10-12all):

This prompt indicates that the CoreBuilder 6000 system contains configurable Fast Ethernet ports in slots 10, 11, and 12.