Cisco 1900 IOS Configuration Commands
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Once you have the duplex set, you can use the show interface command
to view the duplex configuration.
Todd1900EN#sh int f0/26
FastEthernet 0/26 is Suspended-no-linkbeat
Hardware is Built-in 100Base-TX
Address is 0030.80CC.7D1A
MTU 1500 bytes, BW 100000 Kbits
802.1d STP State: Blocking Forward Transitions: 0
Port monitoring: Disabled
Unknown unicast flooding: Enabled
Unregistered multicast flooding: Enabled
Description: trunk_to_Building_4
Duplex setting: Full duplex
Back pressure: Disabled
In this output, the duplex setting shows full duplex.
Verifying IP Connectivity
It is important to test the switch IP configuration. You can use the Ping pro-
gram, and you can telnet into the 1900 switch. However, you cannot telnet
from the 1900 switch or use Traceroute.
In the following example, I pinged a host on the network from the 1900
CLI. Notice the output on a successful Ping: exclamation point (!). If you
receive periods (.) instead of exclamation points, that signifies a time-out.
T A B L E B . 1
Duplex Options
Parameter
Definition
Auto
Set the port into auto-negotiation mode;
default for all 100BaseTX ports.
Full
Forces the 10 or 100Mbps ports into full-duplex
mode.
Full-flow-control
Works only with 100BaseTX ports; uses flow
control so buffers won't overflow.
Half
Forces the ports to work only in half-duplex
mode; default for 10BaseT ports.
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