Here we will discuss about router mode and most used show commands. After booting a router enters into user EXEC mode first. Obviously after giving any credentials if configured earlier. CLI stands for command line interface, most administrators like this mode for configuring the router.
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Different Router mode and explanation-
| Router Mode | Command Explanation |
|---|---|
| Router> | User EXEC Mode, Limited viewing of configuration. You can’t make changes in this mode. |
| Router# | Privileged EXEC mode, can see the configuration and move to make changes. |
| Router(config)# | Global configuration mode. This indicates that you can start making changes. |
| Router(config-if)# | Interface command Mode, configure details of a router ports like IP information. |
| Router(config-subif)# | Sub interface mode, assign multi IP to single physical port. |
| Router(config-line)# | Line command Mode, configure detail about lines like- console, vty, aux etc |
| Router(config-router)# | Router Mode, configure routing and protocols. |
Router basic configuration commands-
Routers most essential commands used to setup a router first.
| Command set | Command explained |
|---|---|
| Router# logout / exit | Logout or one step back |
| Router# setup | Enters startup mode from command line |
| Router# clock set 15:16:00 24 July 2020 | Configure the time and date |
| Router(config)# clock timezone EST –5 | Sets the time zone |
| Router# terminal history size 25 | Set previous keyboard shortcuts number. |
| Router# no terminal history size 25 | Sets the history buffer default to 10 commands. |
| Router(config)# no ip domain-lookup | Turns off trying to automatically resolve an unrecognized command to a local host name |
| Router(config)# banner motd # welcome to router # | Message of the day, Banner shows before enable -router start |
| Router(config)# banner login # welcome to router # | show banner message In login time -telnet |
| Router(config)# line console 0 Router(config-line)# logging synchronous | Logging synchronous-if any display message appear from router, move command to next line. |
| Router(config)# line console 0 Router(config-line)# exec-timeout 10 0 | Set console time out 10 minutes 0 seconds. 0 0 for no terminal time out. |
| Router(config)# ip host kolkata 192.168.1.1 | Assigns a host name to the IP address. Ping name to check work. |
Essential Show commands of router-
Show Commands– it will show various configuration information’s. Here is some useful show commands, Later we will see more information.
| Command set | Command explained |
|---|---|
| Router# show ? | Lists all show commands available. |
| Router# show interfaces | Displays statistics for all interfaces. |
| Router# show interface serial 1/0 | Displays statistics for the specific interface serial 1/0 port. |
| Router# show ip interface brief | Display Information of all ports status. |
| Router# show controllers serial 1/0 | Displays statistics for interface hardware. clock rate is set and if the cable is DCE, DTE, or not attached. |
| Router# show clock | Displays time set on device. |
| Router# show hosts | Displays local host-to-IP address cache. |
| Router# show users | Displays all users connected to device. |
| Router# show history | Displays the history of commands used at this edit level. |
| Router# show arp | Displays the Address Resolution Protocol (ARP) table. |
| Router# show protocols | Displays status of configured Layer 3 protocols. |
| Router(config)# do show running-config | Executes the privileged-level show command |
