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The show version command gives you the router’s configuration register (essentially, the router’s firmware settings for booting up), the last time the router was booted, the version of the IOS, the name of the IOS file, the model of the router, and the router’s amount of RAM and Flash. To clear it of just one route, do clear ip route 1.1.1.1 for clearing out that particular network. To clear the routing table of all routes, you do clear ip route *. This command can be abbreviated shipro and can have parameters after it, like shiproospf for all OSPF routers.
#SHOW INTERFACE ERRORS CISCO COMMAND HOW TO#
This is the list of all networks that the router can reach, their metric (the router’s preference for them), and how to get there. The show ip route command is used to show the router’s routing table. Of course, to bring the interface down, reverse the command and just say shutdown. When you’re having trouble with an interface, you may want to try a shut and no shut. It is useful for new interfaces and for troubleshooting. This command must be used in interface configuration mode. The no shutdown command enables an interface (brings it up). Also from the global configuration mode, you can go into router configuration using the router command. To change a parameter on an interface (like the IP address), go to interface configuration mode with the interface command (where the prompt looks like router(config-if)#). From here, you can change global parameters. Next, type config terminal (or config t) to go to global configuration mode (where the prompt looks like router (config)# ). In privileged mode, you can show anything but not make changes. From there, you type enable to move to privileged mode (where the prompt looks like #). Among other things, this output provides the following: The show interface command displays the status of the router’s interfaces. The copy command can also be used to copy the running or startup configuration from the router to a TFTP server in case something happens to the router. This command can be abbreviated copy run start. In other words, if you edit the router’s configuration, don’t use this command and reboot the router–those changes will be lost. If the power is lost, the NVRAM will preserve this configuration. This command will save the configuration that is currently being modified (in RAM), also known as the running-configuration, to the nonvolatile RAM (NVRAM). #3: copy running-configuration startup-configuration Keep in mind that that config is not saved until you do c opy running-configuration startup-configuration. You change this config when you make changes to the router. The running-configuration is the config that is in the router’s memory. The show running-config command shows the router, switch, or firewall’s current configuration.
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For example, show c? Will return a list of commands that start with the letter c. Finally, use? To see all commands that start with a particular letter.
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For example, you might type show ip? If the router requires no other parameters for the command, the router will offer CR as the only option. You can also use? When don’t know what a command’s next parameter should be. For example, type? At the command line for a list of all possible commands. First, use it when you don’t know what command to type. As the IOS is a command-line operating system with thousands of possible commands and parameters, using the? Can save your day. However, the Cisco IOS is completely different from other operating systems when it comes to using the question mark (help key). It may seem entirely too obvious that you should know how to type? To ask for help when using the Cisco IOS. This list contains the 10 commands every Cisco IOS user should know inside and out. This quick reference describes 10 commands you’ll need to rely on when handling various configuration and troubleshooting tasks. As the Cisco IOS is riddled with thousands of commands, configuring it can be challenging and learning some essential commands is necessary.