LevelOne GTL-2691 - Manual (Page 752)

C HAPTER 22 | Using the Command Line Interface
Entering Commands
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N EGATING THE E FFECT
OF C OMMANDS
For many configuration commands you can enter the prefix keyword “no”
to cancel the effect of a command or reset the configuration to the default
value. For example, the logging command will log system messages to a
host server. To disable logging, specify the no logging command. This
guide describes the negation effect for all applicable commands.
U SING C OMMAND
H ISTORY
The CLI maintains a history of commands that have been entered. You can
scroll back through the history of commands by pressing the up arrow key.
Any command displayed in the history list can be executed again, or first
modified and then executed.
Using the show history command displays a longer list of recently
executed commands.
U NDERSTANDING
C OMMAND M ODES
The command set is divided into Exec and Configuration classes. Exec
commands generally display information on system status or clear
statistical counters. Configuration commands, on the other hand, modify
interface parameters or enable certain switching functions. These classes
are further divided into different modes. Available commands depend on
the selected mode. You can always enter a question mark “?” at the
prompt to display a list of the commands available for the current mode.
The command classes and associated modes are displayed in the following
table:
E XEC C OMMANDS
When you open a new console session on the switch with the user name
and password “guest,” the system enters the Normal Exec command mode
(or guest mode), displaying the “Console>” command prompt. Only a
limited number of the commands are available in this mode. You can
access all commands only from the Privileged Exec command mode (or
administrator mode). To access Privilege Exec mode, open a new console
session with the user name and password “admin.” The system will now
Table 39: General Command Modes
Class Mode
Exec Normal
Privileged
Configuration Global *
* You must be in Privileged Exec mode to access the Global configuration mode.
You must be in Global Configuration mode to access any of the other configuration
modes.
Access Control List
Class Map
DHCP
IGMP Profile
Interface
Line
Multiple Spanning Tree
Policy Map
Router
Time Range
VLAN Database