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14 COREBUILDER 6000 INTELLIGENT SWITCHING SOFTWARE REVISION 8.2.0
5 Enter 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.
6 Repeat 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 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:
1 From the top level of the Administration Console, enter:
ethernet fastEthernet ifm
You receive a prompt similar to the following:
Select slot(s) (10-12|all):
This prompt indicates that the CoreBuilder 6000 system contains
configurable Fast Ethernet ports in slots 10, 11, and 12.
Top-Level Menu
system
➧ethernet
fddi
tokenring
bridge
ip
snmp
analyzer
script
logout
summary
detail
➧fastEthernet
label
portState
s
duplexMode
➧ifm