Basic Cisco Commands and Setup

Cisco Router Configuration Commands

Cisco Command
Set a console password to cisco Router(config)#line con 0


Router(config-line)#password cisco

Set a telnet password Router(config)#line vty 0 4


Router(config-line)#password cisco

Stop console timing out Router(config)#line con 0

Router(config-line)#exec-timeout 0 0

Set the enable password to cisco Router(config)#enable password cisco
Set the enable secret password to peter.

This password overrides the enable password and is encypted within the config file

Router(config)#enable secret peter
Enable an interface Router(config-if)#no shutdown
To disable an interface Router(config-if)#shutdown
Set the clock rate for a router with a DCE cable to 64K Router(config-if)clock rate 64000
Set a logical bandwidth assignment of 64K to the serial interface Router(config-if)bandwidth 64

Note that the zeroes are not missing

To add an IP address to a interface Router(config-if)#ip addr
To enable RIP on all 172.16.x.y interfaces Router(config)#router rip


Disable RIP Router(config)#no router rip
To enable IRGP with a AS of 200, to all interfaces Router(config)#router igrp 200


Disable IGRP Router(config)#no router igrp 200
Static route the remote network is, with a mask of, the next hop is, at a cost of 5 hops Router(config)#ip route 5
Disable CDP for the whole router Router(config)#no cdp run
Enable CDP for he whole router Router(config)#cdp run
Disable CDP on an interface Router(config-if)#no cdp enable

Cisco Router Show Commands

Cisco Command
View version information show version
View current configuration (DRAM) show running-config
View startup configuration (NVRAM) show startup-config
Show IOS file and flash space show flash
Shows all logs that the router has in its memory show log
View the interface status of interface e0 show interface e0
Overview all interfaces on the router show ip interfaces brief
View type of serial cable on s0 show controllers 0

(note the space between the 's' and the '0')

Display a summary of connected cdp devices show cdp neighbor
Display detailed information on all devices show cdp entry *
Display current routing protocols show ip protocols
Display IP routing table show ip route
Display access lists, this includes the number of displayed matches show access-lists
Check the router can see the ISDN switch show isdn status
Check a Frame Relay PVC connections show frame-relay pvc
show lmi traffic stats show frame-relay lmi
Display the frame inverse ARP table show frame-relay map

Cisco Router Basic Operations

Cisco Command
Enable Enter privileged mode
Return to user mode from privileged disable
Exit Router Logout or exit or quit
Recall last command up arrow or <Ctrl-P>
Recall next command down arrow or <Ctrl-N>
Suspend or abort <Shift> and  <Ctrl> and 6 then x
Refresh screen output <Ctrl-R>
Compleat Command TAB

Cisco Router Copy Commands

Cisco Command
Save the current configuration from DRAM to NVRAM copy running-config startup-config
Merge NVRAM configuration to DRAM copy startup-config running-config
Copy DRAM configuration to a TFTP server copy runing-config tftp
Merge TFTP configuration with current router configuration held in DRAM copy tftp runing-config
Backup the IOS onto a TFTP server copy flash tftp
Upgrade the router IOS from a TFTP server copy tftp flash

Cisco Router Debug Commands

Cisco Command
Enable debug for RIP debug ip rip
Enable summary IGRP debug information debug ip igrp events
Enable detailed IGRP debug information debug ip igrp transactions
Debug IPX RIP debug ipx routing activity
Debug IPX SAP debug IPX SAP
Enable debug for CHAP or PAP debug ppp authentication
Switch all debugging off no debug all

undebug all