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FE half-duplex operation is the default. To change to full-duplex operation, use the following series
of commands:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Router(config)# interface fastethernet 3/0/0
Router(config-if)# full-duplex
Ctrl-z
Each 100BASE-TX or 100BASE-FX interface on an FEIP can be configured at 100 Mbps,
Note
half duplex or full duplex, for a maximum aggregate bandwidth of 200 Mbps.
To prevent oversubscribing the FEIP, we recommend that you do not operate both FE interfaces on
Caution
an FEIP in full-duplex mode.
Using the show interfaces fastethernet command, you can see that the 3/0/0 interface is now
configured for full-duplex operation:
Router# sh int fa 3/0/0
FastEthernet 3/0/0 is administratively up, line protocol is up
(display text omitted)
Encapsulation ARPA, loopback not set, keepalive not set, fdx, 100BaseTX
To return the interface to half-duplex operation, use the no full-duplex configuration command as
follows:
Router# config t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# int fa 3/0/0
Router(config-if)# no full-duplex
Ctrl-z
Router#
Using the show interfaces fastethernet command, you can see that the 3/0/0 interface is now
configured for half-duplex operation:
Router# sh int fa 3/0/0
FastEthernet3/0/0 is administratively up, line protocol is up
(display text omitted)
Encapsulation ARPA, loopback not set, keepalive not set, hdx, 100BaseTX
(display text omitted)
Configuring Interfaces—Descriptions and Examples
Fast Ethernet Interface Processor (FEIP) Installation and Configuration
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