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Sunday, March 22, 2009

Cisco Router Configuration Commands

Cisco Router Configuration Commands

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

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

Enter privileged mode

Return to user mode from privileged

Exit Router
Logout or exit or quit

Recall last command
up arrow or

Recall next command
down arrow or

Suspend or abort
and and 6 then x

Refresh screen output

Compleat Command

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 routing activity

debug IPX SAP

Enable debug for CHAP or PAP
debug ppp authentication

Switch all debugging off
no debug all

undebug all

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