Common and Basic Cisco Commands

Common and Basic Cisco Commands

This list is just a quick list of tips and commands that are only for my reference. These are just quick inputs and notes, and these are not considered a walkthrough. This list will constantly be updated over time and when I have time to update it.

·         You type in something wrong and get the “Translating “your incorrect entry” …domain server (255.255.255.255), you can stop this in the middle of it by the following:

o   Ctrl+Shift+6 will abort this process.

·         To prevent the Cisco device from trying to resolve an incorrect entry into an IP address, you can put in the following:

o   Escalate up to “configure terminal” mode

o   Enter the following command: #no ip domain-lookup

·         You can see the previous history of entered commands by typing in:

o   #show history

o   If you want to change the size of the history, perform the following:

§  Escalate to configure terminal level

§  Select console line by typing the following: #line console 0

§  Next type in #history size 50. You can put in any number from 0-256 for how many lines you want history to remember.

·         You can exit by doing Ctrl+Z or by typing #exit.

o   Typing #end will take you all the way back to the beginning of the Cisco device privilege modes.

·         You can see what is on the hard drive or flash of a Cisco device by typing in #show flash.

o   If you want to remove files on the flash, execute the following:

§  #delete flash:’filename’

§  Confirm the deletion.

o   Sometimes files can be deleted by the following command (if they are still stored and not being deleted) #squeeze flash.

·         One vital command which is helpful is the ability to reload the router through CLI. This is performed by typing the following command:

o   #reload in 5

o   This reboots the router in 5 minutes. You can have it reboot in any amount of time you designate.

o   This allows you to wipe the configuration if you have not already committed the changes and saved to the flash.

o   #reload cancel cancels the reboot.

·         #show running-config to show the current configurations which are running on the Cisco device.

·         #show startup-config to show the configurations which will be loaded into the Cisco device upon boot.

·         #copy running-config startup-config” will give you the option to save your current running configuration to the startup configuration fle.

o   #copy run startup-config and #write memory commands also save the configurations (can also just type write).

·         #write erase will allow you to erase your saved configurations in NVRAM and take you back to factory defaults.

·         To kick users from the device execute the following:

o   #show users

o   #clear line vty #

·         To show spanning-tree information for priorities, if an interface is blocked, designated, or the switch is root, and other information:
“show spanning-tree” will display the information.