What’s New at Revision 8.2.0?

17

Top-Level Menu

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 in brackets. To select this default, press Return. This action leaves the port duplex mode unchanged.

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

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 that is 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 congestion ends.

Intelligent flow management is supported only on half-duplex ports. It is disabled on port that are configured for full-duplex mode. 3Com recommends that you disable IFM on network segments that are connected to repeaters.

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

1From the top level of the Administration Console, enter:

system

 

 

 

ethernet

summary

 

 

fddi

 

 

detail

s

 

 

duplexMode

tokenringfastEthernet

ifm

bridge

label

 

 

ip

 

 

portState

 

 

ipx

 

 

 

 

 

appletalk

 

 

 

snmp

 

 

 

analyzer

 

 

 

script

 

 

 

logout

 

 

 

ethernet fastEthernet ifm

A prompt similar to the following one appears:

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

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

2Enter the number(s) of the slot(s) that contain ports that you want to set to IFM mode:

10-12

Default To select the default all, press Return.

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3Com 10002211 manual Default To select the default all, press Return