Cisco Router Commands

Basic Commands

Commands                                                     Descriptions

Enable                                                 Enter the privileged mode.
Log out                                               Exit router.
Down error                                          Recall next command
Up error                                               Recall last command
Tab                                                      Complete command
config t                                                It is used to add a router
ip route ipaddress subnetmask
destination        

Configuration Commands

Command                                                                              Description

Router(config-if)#no shutdown                                            Enable an interface
Router(config-if)#ip addr 10.1.1.1 255.255.255.0                To add a IP address to a interface
Router(config-if)clock rate 64000                                         Set the clock rate of the router with the DCE cable to 64 K
Router(config)#enable password Cisco                                 Set the enable password to Cisco router

 Router(config)#line vty 0 4                                                   Set a telnet password
Router(config-line)#login
Router(config-line)#password cisco
Router(config)#no router rip                                                 Disable RIP
Router(config)#no router igrp 200                                        Disable IGRP
Router(config)#cdp run                                                         Enable CDP for the router
Router(config)#line con 0                                                      Set a console
password to Cisco router
Router(config-line)#login
Router(config-line)#password cisco

Interface Commands

Commands                                                                 Description

no ip redirects                                     It allows the system to change the way that packets are routed in a network

no ip unreachable                                Unreachable messages are sent when a host sends packets to the destination
no cdp enable                                      CDP should be disabled on all the internet interfaces.

Copy Commands

Commands                                                     Description

Copy flash tftp                                    backup the IOS into the TFTP server
Copy tftp flash                                    Upgrade a router IOS from a TFTP
Copy running-config tftp        Copy DRAM configurations to a TFTP server
Copy tftp running-config        It merges the TFTP configurations with the current router configurations in the DRAM

Debug Commands

Commands                                                     Description

debug ip rip                                                     debug ip rip
debug ppp authentication                               Enable debug for CHAP or PAP
undebug all                                                     Switch all debugging off
debug ip igrp events                                        Enable summary IGRP debug information

Show Commands

 Commands                                                                 Description

Show version                                                              It shows the version of your of IOS
Show flash                                                                  Show flash space
Show log                                                                     It shows all the logs, which a router has in its memory
show ip route                                                              Display IP routing table
show isdn status                                                          Shows the status of the ISDN connection
show running-config                                                   It shows the current running configurations.