Could be completely also obvious that you can know how to form? For you to require guide when using the Cisco IOS. On the other hand, the actual Cisco IOS is completely distinctive from additional os's with regards to when using the problem mark (help key). Since the IOS is usually a command-line main system with a huge number of probable codes and also variables, when using the? May keep your time.
You need to use the actual command in lots of ways. Very first, put it to use whenever you don’t know very well what command to be able to form. One example is, form? At the command range intended for a list of many probable codes. You can also utilize? Once you don’t know very well what some sort of command’s future parameter ought to be. One example is, you could possibly form indicate ip? When the router demands no additional variables for your command, the actual router will offer CR because the solely solution. Last but not least, utilize? To view many codes in which begin with a selected page. One example is, indicate h? Will certainly return a list of codes in which begin with the actual page h.
2: Show Running-Configuration.
This indicate running-config control displays your router, transition, or perhaps firewall’s existing setup. This running-configuration is the config that's inside the router’s recollection. Anyone modify this specific config after you create adjustments towards the router. Understand that config seriously isn't rescued before you perform a copy running-configuration startup-configuration. This control may be abbreviated sh manage.
3: Copy Running-Configuration Startup-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). If the power is lost, the NVRAM will preserve this configuration. In other words, if you edit the router’s configuration, don’t use this command and reboot the router–those changes will be lost. This command can be abbreviated copy run start. 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.
4: Show Interface.
The show interface command displays the status of the router’s interfaces. Among other things, this output provides the following:
- Interface status (up/down)
- Protocol status on the interface
- Utilization
- Errors
- MTU
This command is essential for troubleshooting a router or switch. It can also be used by specifying a certain interface, like shint fa0/0.
5: Show IP Interface.
Even more popular than show interface are show ip interface and show ip interface brief. Theshow ip interface command provides tons of useful information about the configuration and status of the IP protocol and its services, on all interfaces. The show ip interface brief command provides a quick status of the interfaces on the router, including their IP address, Layer 2 status, and Layer 3 status.
6: Config Terminal, Enable, Interface, And Router.
Cisco routers have different modes where only certain things can be shown or certain things can be changed. Being able to move between these modes is critical to successfully configuring the router.
For example, when logging in, you start off at the user mode (where the prompt looks like >). From there, you type enable to move to privileged mode (where the prompt looks like #). In privileged mode, you can show anything but not make changes. Next, type config terminal (orconfig t) to go to global configuration mode (where the prompt looks like router (config) #). From here, you can change global parameters. 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) #). Also from the global configuration mode, you can go into router configuration using the router {protocol} command. To exit from a mode, type exit.
7: No Shutdown.
The no shutdown command enables an interface (brings it up). This command must be used in interface configuration mode. It is useful for new interfaces and for troubleshooting. When you’re having trouble with an interface, you may want to try a shut and no shut. Of course, to bring the interface down, reverse the command and just say shutdown. This command can be abbreviated no shut.
8: Show IP Route.
The show ip route command is used to show the router’s routing table. 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. This command can be abbreviated shipro and can have parameters after it, likeshiproospf for all OSPF routers. To clear the routing table of all routes, you do clear ip route *. To clear it of just one route, do clear ip route 1.1.1.1 for clearing out that particular network.
9: Show Version.
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. This command can be abbreviated shver.
10: Debug.
The debug command has many options and does not work by itself. It provides detailed debugging output on a certain application, protocol, or service. For example, debug ip route will tell you every time a router is added to or removed from the router.