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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 10 Configuring Interface Characteristics
Monitoring and Maintaining the Interfaces
Monitoring Interface and Controller Status
Commands entered at the privileged EXEC prompt display information about the interface, including
the version of the software and the hardware, the controller status, and statistics about the interfaces.
Table 10-2 lists some of these interface monitoring commands. (You can display the full list of show
commands by using the show ? command at the privileged EXEC prompt.) These commands are fully
described in the Cisco IOS Interface Command Reference for Cisco IOS Release 12.1.
For examples of the output from these commands, see the command reference for this release and the
Cisco IOS Interface Command Reference for Cisco IOS Release 12.1.
If you enter the show interfaces interfaces-id privileged EXEC command on a LRE switch interface,
the command output shows the statistics for the LRE interface. It does not show the statistics for the
10/100 Ethernet ports on the attached CPE device. The output also shows that the speed and duplex
settings of the LRE interface are never autonegotiated but are always forced (in other words, the speed
and duplex settings will be 100 Mbps and half duplex, 100 Mbps and full duplex, 10 Mbps and half
duplex, or 10 Mbps and full duplex).
Clearing and Resetting Interfaces and Counters
Table 10-3 lists the privileged EXEC mode clear commands that you can use to clear counters and reset
interfaces.
Ta b l e 10-2 show Commands for Interfaces
Command Purpose
show interfaces [interface-id] Display the status and configuration of all interfaces or a specific
interface.
show interfaces [interface-id] capabilities [module
{module-number}]
Display the capabilities of an interface. The module number is always
0. If you enter an interface ID, the module keyword is not visible.
show interfaces interface-id status [err-disabled] Display interface status or a list of interfaces in error-disabled state.
show interfaces [interface-id] switchport Display administrative and operational status of switching
(nonrouting) ports.
show interfaces [interface-id] description Display the description configured on an interface or all interfaces and
the interface status.
show ip interface [interface-id] Display the usability status of all interfaces configured for IP or the
specified interface.
show interfaces transceiver properties (Optional) Display speed and duplex settings on the interface.
show running-config interface [interface-id] Display the running configuration in RAM for the interface.
show version Display the hardware configuration, software version, the names and
sources of configuration files, and the boot images.
Ta b l e 10-3 Clear Commands for Interfaces
Command Purpose
clear counters [interface-id] Clear interface counters.