For day in day out, below are frequently used commands while working on Cisco iOS
‘?’ – It’s difficult for a beginner to remember all the commands while working. ‘?’ will help to list commands when entered. Its required to understand the usage of the ‘?’, when you are in search of command starting with S, the usage should be ‘? s’ this will list down all the commands starting with ‘s’
Show interface –This command will display the status of the running interface. It’s mainly used for troubleshooting any issues with in the interface. This command can also be used by specifying certain interface too. Usually the output of the interface is a combination of Interface status, protocol status, consumption, any errors, MTU
Show ip route – With this command, we can find out which all network routers can reach and how to reach it.
Show version – This command will provide information on routers configuration register, last router restart, router capacity, version and name of iOS, name of the iOS
Debug – Debug is used to troubleshoot a problem. It gives many detailed information on a service, protocol, or certain application. Make a note to disable debug all the times with the caution that it takes the high memory and precedence of all the processes. Debug should be enabled on requirement basis.
No shutdown – This command will start the interface. Most of the cases, this command is used during the restart process for debug. Using the command as shutdown will shut the interface.
Show access-lists – This command is used to find out what has been defined in the access control lists and displays as an output.
IP routing – This will turn on IP routing and the ‘no ip routing’ will turn off the IP routing.
Copy running and startup configuration – This command will save the running configuration into the non-volatile RAM(VRAM). In case of power outages or sudden restart of the system, configuration can be written back from VRAM. Copy can also be used to copy the configuration and restore during system restart.
Show running configuration – This will show the current configuration of the router, firewall and switch, this configuration will be fetched from routers memory and can be changed if we would like to make changes to the router configuration.
Exit – Based on the terminal that you are working on, it will log off the router, returns the user to the intended mode, returns the user to global configuration mode.
Router rip – sets the IP address of the router
To learn Cisco Certification