Getting started with Cisco switches 1

First, the basic command

1.4 Different modes

switch> User Mode

Switch>enable input enable (EN) into privileged mode

switch# Privileged Mode

Switch#config terminal Input Config terminal (abbreviated conf t) into the full configuration board mode

switch (config) # Global configuration Mode

switch (config) #interface fastethernet 0/1 Input Interface fastethernet 0/1 (abbreviated int F0/1) Enter interface mode

switch (config-if) # interface mode

how to return or exit to the previous mode

The exit command can be returned to a previous pattern

Privileged mode return to user mode can use disable

In global or interface mode you can use end to return to privileged mode or use the shortcut key "Ctrl + Z"

2. Common commands

Enter hostname in privileged mode to configure host name

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The Show command is typically used to query information in privileged mode

Show version (Sh ver) to view the system iOS name and version information

Show Mac-addess-table view MAC Address Table command followed by parameter "dynamic" for viewing dynamically learned MAC address

Show Running-config (abbreviated as SH run) is used to view the current configuration information for the switch.

Show Startup-config (abbreviated as SH star) is used to view the saved configuration information.

3. Configure Duplex Mode and rate

Sw#show Interf F0/1 (abbreviated to SH int f0/1) View interface Duplex mode and rate

SW (config) #int f0/1 into F0/1 interface

SW (config-if) #duplex full is set to fully-duplex mode, and the parameter "complete" can be changed to "half" half-duplex or "Auto" auto-reconcile

Note: A serious packet loss may occur when the interface duplex mismatch

SW (config) #int f0/1 Enter the F0/1 interface

SW (config-if) #speed set at a rate of 10mb/s, the parameter "10" can be changed to "up to" TenMB/s,

"1000MB/S" or Auto Reconcile

Note: The interface rate does not match and the two switches will not be able to communicate

4.copy Running-config Startup-config (abbreviated as copy run Star) You can also use another command , write (WR), to save the current configuration information, as the configuration of the switch takes effect in a timely manner , but after the restart if not saved to the NVRAM will be lost, so after the configuration should be saved in time.

5.erase NVRAM is equivalent to delete nvram:startup-config for deleting saved configuration information.

6. Configure the console port password (used when connecting to the console line)

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7. Configure the privileged mode password

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Note: When both passwords are set, only the secret password takes effect

8. Configure the encrypted plaintext password

SW (config) #service password-encryption

* Note: Cisco device passwords cannot start with a space

Second, switch password recovery

The password of the switch is saved in the Flash configuration file config.text, want to recover the password, it is necessary to bypass Config.text this file, first enter the system, then reset the password.

Step one, because the Cisco switch Factory settings are no password, so you can restart the switch (unplug the switch and then reconnect) immediately press and hold the "mode" button on the switch. When you see the Configuration Interface display ()

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Step two, initialize the Flash with the "flash_init" command

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Step three, change the profile Config.text file name to Config.old so that the switch does not load the configuration file, and then start the switch

Switch:rename flash:config.text flash:config.old Rename rename command

switch:boot Starting the switch

Step four, after entering the system, the name of the configuration file is changed back (because there are not only passwords in the configuration file, there are many parameters)

switch#rename flash:config.old Flash:config.text

Step five, manually load the configuration file

switch#copy flash:config.text system:running-config

Step six, after the load is complete, go to the global mode to modify the password you want to change, configure the password reference before the command

The third article, feel a little bit small state, refueling ~

Getting started with Cisco switches 1