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Appendix B
Configuring the Catalyst 1900 Switch
Current configuration:
hostname "Todd1900EN"
!
ip address 172.16.10.16 255.255.255.0
ip default-gateway 172.16.10.1
!
interface Ethernet 0/1
description "Finance_VLAN"
!
[output cut]
Notice that the sh int e0/1 command and show run command both
show the description command set on an interface.
Configuring the Port Duplex
The 1900 switch has only 12 or 24 10BaseT ports and comes with one or
two Fast Ethernet ports. You can only set the duplex on the 1900 switch,
as the ports are all fixed speeds. Use the duplex command in interface
configuration.
In this switch output, notice the options available on the Fast-Ethernet
ports:
Todd1900EN(config)#int f0/26
Todd1900EN(config-if)#duplex ?
auto Enable auto duplex configuration
full Force full duplex operation
full-flow-control Force full duplex with flow control
half Force half duplex operation
Todd1900EN(config-if)#duplex full
Table B.1 shows the duplex options available on the 1900 switches.
The 1900 Fast Ethernet ports default to auto duplex, which means they
will try to auto-detect the duplex the other end is running. This may or
may not work. It is a good rule of thumb to set the duplex to half on a Fast
Ethernet port.
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