2.6.1 Entering Interface Numbers
In the Global Configuration mode, you can configure a command that only applies to interfaces
specified. For example, you can set up each interface‟s VLAN assignment, speeds, or duplex
modes. To configure, you must first enter the interface number. There are four ways to enter your
interface numbers to signify the combination of different interfaces that apply a command or
commands.
Switch(config)# interface 1
Switch(config-if-1)#
Enter a single interface. Only interface 1 will
apply commands entered.
Switch(config)# interface 1,3,5
Switch(config-if-1,3,5)#
Enter three discontinuous interfaces,
separated by commas. Interface 1, 3, 5 will
apply commands entered.
Switch(config)# interface 1-3
Switch(config-if-1-3)#
Enter three continuous interfaces. Use a
hyphen to signify a range of interface
numbers. In this example, interface 1, 2, and
3 will apply commands entered.
Switch(config)# interface 1,3-5
Switch(config-if-1,3-5)#
Enter a single interface number together with
a range of interface numbers. Use both
comma and hypen to signify the combination
of different interface numbers. In this
example, interface 1, 3, 4, 5 will apply
commands entered.
2.6.2 No Command
Almost every command that you enter in Configuration mode can be negated using “no” command
followed by the original or similar command. The purpose of “no” command is to disable a function,
remove a command, or set the setting back to the default value. In each sub-section below, the
use of no command to fulfill different purposes will be introduced.
2.6.3 Show Command
The “show” command is very important for network administrators to get information about the
device, receive outputs to verify a command‟s configurations or troubleshoot a network
configuration error. It can be used in Privileged or Configuration mode. The following describes
different uses of “show” command.
1. Display system information
Enter “show switch-info” command in Privileged or Configuration mode, and then the following
similar screen page will appear.
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