Friday, February 13, 2015

Cisco 3750 Switch Command




Cisco Catalyst 3750 is next-generation energy-efficient Layer 3 Fast Ethernet stackable switches while 3750X is layer 3 GE switches. The Cisco Catalyst 3750 v2 Series consumes less power than its predecessors 3750. The 3750-X Series Switches are enterprise-class lines of stackable and standalone switches with StackWise Plus technology, they are the replacement of Cisco 3750G and 3750E switches. Here are some commands on Cisco 3750 switches for your reference.

CLI Command Modes
This section describes the CLI command mode structure. Command modes support specific Cisco IOS commands. For example, the interface interface-id command only works when entered in global configuration mode.
These are the main command modes for the switch:
l        User EXEC
l        Privileged EXEC
l        Global configuration
l        Interface configuration
l        Config-vlan
l        VLAN configuration
l        Line configuration

The below table lists the main command modes, how to access each mode, the prompt you see in that mode, and how to exit that mode. The prompts listed use the default name Switch.


User EXEC Mode
After you access the device, you are automatically in user EXEC command mode. The EXEC commands available at the user level are a subset of those available at the privileged level. In general, use the user EXEC commands to temporarily change terminal settings, perform basic tests, and list system information.
The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch> ?

Privileged EXEC Mode
Because many of the privileged commands configure operating parameters, privileged access should be password-protected to prevent unauthorized use. The privileged command set includes those commands contained in user EXEC mode, as well as the configure privileged EXEC command through which you access the remaining command modes.
If your system administrator has set a password, you are prompted to enter it before being granted access to privileged EXEC mode. The password does not appear on the screen and is case sensitive.
The privileged EXEC mode prompt is the device name followed by the pound sign (#).
Switch# 

Enter the enable command to access privileged EXEC mode:
Switch> enable
Switch#

The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch# ?

To return to user EXEC mode, enter the disable privileged EXEC command.

Global Configuration Mode
Global configuration commands apply to features that affect the device as a whole. Use the configure privileged EXEC command to enter global configuration mode. The default is to enter commands from the management console.
When you enter the configure command, a message prompts you for the source of the configuration commands:
Switch# configure
Configuring from terminal, memory, or network [terminal]?

You can specify either the terminal or NVRAM as the source of configuration commands.
This example shows you how to access global configuration mode:
Switch# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.

The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch(config)# ?

To exit global configuration command mode and to return to privileged EXEC mode, enter the end or exit command, or press Ctrl-Z.

Interface Configuration Mode
Interface configuration commands modify the operation of the interface. Interface configuration commands always follow a global configuration command, which defines the interface type.
Use the interface interface-id command to access interface configuration mode. The new prompt means interface configuration mode.
Switch(config-if)#

The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch(config-if)# ?

To exit interface configuration mode and to return to global configuration mode, enter the exit command. To exit interface configuration mode and to return to privileged EXEC mode, enter the end command, or press Ctrl-Z.

config-vlan Mode
Use this mode to configure normal-range VLANs (VLAN IDs 1 to 1005) or, when VTP mode is transparent, to configure extended-range VLANs (VLAN IDs 1006 to 4094). When VTP mode is transparent, the VLAN and VTP configuration is saved in the running configuration file, and you can save it to the switch startup configuration file by using the copy running-config startup-config privileged EXEC command. The configurations of VLAN IDs 1 to 1005 are saved in the VLAN database if VTP is in transparent or server mode. The extended-range VLAN configurations are not saved in the VLAN database.
Enter the vlan vlan-id global configuration command to access config-vlan mode:
Switch(config)# vlan 2000
Switch(config-vlan)#

The supported keywords can vary but are similar to the commands available in VLAN configuration mode. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch(config-vlan)# ?

For extended-range VLANs, all characteristics except the MTU size must remain at the default setting.
To return to global configuration mode, enter exit; to return to privileged EXEC mode, enter end. All the commands except shutdown take effect when you exit config-vlan mode.

VLAN Configuration Mode
You can use the VLAN configuration commands to create or modify VLAN parameters for VLAN IDs 1 to 1005.
Enter the vlan database privileged EXEC command to access VLAN configuration mode:
Switch# vlan database
Switch(vlan)#

The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch(vlan)# ?

To return to privileged EXEC mode, enter the abort VLAN configuration command to abandon the proposed database. Otherwise, enter exit to implement the proposed new VLAN database and to return to privileged EXEC mode. When you enter exit or apply, the configuration is saved in the VLAN database; configuration from VLAN configuration mode cannot be saved in the switch configuration file.

Line Configuration Mode
Line configuration commands modify the operation of a terminal line. Line configuration commands always follow a line command, which defines a line number. Use these commands to change terminal parameter settings line-by-line or for a range of lines.
Use the line vty line_number [ending_line_number] command to enter line configuration mode. The new prompt means line configuration mode. The following example shows how to enter line configuration mode for virtual terminal line 7:
Switch(config)# line vty 0 7

The supported commands can vary depending on the version of software in use. To display a comprehensive list of commands, enter a question mark (?) at the prompt.
Switch(config-line)# ?

To exit line configuration mode and to return to global configuration mode, use the exit command. To exit line configuration mode and to return to privileged EXEC mode, enter the end command, or press Ctrl-Z.





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