cisco switch useful commands list || AQ Learning Center ||

Cisco Switches commands

Cisco IOS provides thousands of useful commands to troubleshoot all related layers issues. Today we will discuss some useful commands and trick which you should follow for the batter and quick troubleshooting.

1 The question mark (?)

As we all know Cisco IOS having thousands of commands, it's not possible to remember each and every command. For me and my experience, question mark (?) is best feature cisco have to remember/troubleshoot issues in quick time. If you forget any complete command then you can type ? after the command then Cisco IOS tells every possible command. AQ learning center switch screenshot is given below:

2 show running-configuration

For me, second very useful command is show running-config. It shows all current configurations of the switch.

NOTE:

please remember that current configurations are saved in Flash (temporary memory) and if your switch power goes down then all configuration will be removed from the switch. All you need to do is, if you configure anything in switch then give WR or copy running-config startup-config command then your configuration will be moved towards NVRAM (permanent memory).

you can check all your NVRAM configuration by show start-up config

Troubleshooting tip:

Here is a troubleshooting tip by using this feature, you can use this feature for troubleshooting as well. Suppose your boss asks you to configure XYZ in the live environment and by misconfiguration you lost your live switch and all goes down. oh it's really horrible. you can get back your old configurations by power off the switch and then again by power up (saves you :p). Always remember one thing during troubleshooting if you are enough sure that your configuration is fine, only when applying copy running-config startup-config command only

3 Show IP interface brief

The show IP interface brief command displays the following information

Interface status is up/down
protocol up/down
VLAN IP address information (SVI)

4 Show version

The show version command displays IOS software version and other hardware details of the switch. It includes

Cisco IOS software
Cisco IOS version
Switch uptime (very useful)
IOS image
Switch serial number
Switch Mac address
Switch model number

5 Debug

The debug command is also a very useful command for Cisco IOS. You can troubleshoot any kind of issue by apply to debug then every log/ errors will be displayed at the CLI then you can easily troubleshoot the issue. Suppose here we are facing interface FastEthernet 0/1 issue. the interface will go in error disable mode then we simply put under mentioned command for troubleshooting the issue.

After applying this command you will get all related logs of interface FastEthernet 0/1.

Troubleshooting Tip.

Here is one tip for troubleshooting for the real-time issues. After applying these command you will display some error/logs to your CLI. If you are not sure what is the issue about then you can simply post these errors/logs to google then a discussion about these errors will be opened and it will be very helpful for the quick resolution.

Also, find the link below for more batter understanding (very informative link)

https://www.cisco.com/E-Learning/bulk/public/tac/cim/cib/using_cisco_ios_software/07_basic_commands_tasks.htm

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