Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
14
Cisco IOS Release 12.3(8)T4
OL-6454-01
Configuring the Interface Duplex Mode
Beginning in global configuration mode, follow these steps to set the duplex mode of a Fast Ethernet
interface.
SUMMARY STEPS
1. interface fastethernet interface-id
2. duplex [auto | full | half]
DETAILED STEPS
Note If you set the port speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are auto
negotiated. You cannot change the duplex mode of auto negotiation interfaces.
The following example shows how to set the interface duplex mode to auto on Fast Ethernet interface 3:
Router(config)#interface fastethernet 0/1/0
router(config-if)#speed 100
Router(config-if)#duplex auto
Router(config-if)#end
Verifying Interface Speed and Duplex Mode Configuration
Use the show interfaces command to verify the interface speed and duplex mode configuration for an
interface, as shown in the following output example:
Router#show interfaces fastethernet 0/1/0
FastEthernet0/1/0 is up, line protocol is up
Hardware is Fast Ethernet, address is 000f.f70a.f272 (bia 000f.f70a.f272)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:11, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
4 packets input, 1073 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
6 packets output, 664 bytes, 0 underruns(0/0/0)
0 output errors, 0 collisions, 3 interface resets
Command Purpose
Step 1
Router(config)#interface fastethernet
interface-id
Selects the interface to be configured.
Step 2
Router(config-if)#duplex [auto | full |
half]
Sets the duplex mode of the interface.