Cisco Internetworking Revision Sheet

Basic Router Operations

To get to User Mode Press ENTER and a password if required.

To get to Privileged Mode Router>enable

To get back to User Mode Router#disable

To Exit the Router Router>exit or logoff

Break Key <shift>+<ctrl>+6 ‘x’

To move to the beginning of the command line Ctrl+A

To move to the end of the command line Ctrl+E

To move forward one character Ctrl+F [or right arrow key]

To move back one character Ctrl+B [or left arrow key]

To repeat the previous command Ctrl+P [or up arrow key]

To repeat the most recent (last) command Ctrl+N [or down arrow key]

To move back one word Esc+B

To move forward one word Esc+F

To erase a word Ctrl+W

To erase a line Ctrl+U

To redisplay a line Ctrl+R

Ends configuration mode and returns to privileged mode Router#Ctrl+Z

To auto complete a command <tab>

To show the command buffer Router>show history

To set the command buffer size Router>terminal history size

To disable advanced editing features Router>terminal no editing

To re-enable advanced editing features Router>terminal editing

Viewing Router Information

View IOS version Router#show version

View current configuration file (RAM) Router#show running-config

View saved configuration file (NVRAM) Router#show startup-config

View IOS version, size of IOS, and free space in FLASH Router#show flash

View CPU utilization Router#show processes cpu

View info about programs in RAM Router#show processes

Display interfaces on router and their status Router#show interface

Display the ip interfaces on router and their status Router#show ip interface

Display which protocols are configured on the router Router#show protocol

Display ip protocol info Router#show ip protocol

Cisco Discovery Protocol

View info of neighboring Cisco devices (routers, switches,etc) Router#show cdp neighbors [ show cdp neighbor detail]

View interface info, default encap, cdp update and holdtime freq Router#show cdp interface

View a neighbors details Router#show cdp entry RouterB

View cdp update and holdtime frequency Router#show cdp

Change update frequency Router#cdp timer 90 [60 sec is default]

Change how long to hold a CDP entry of a neighbor for Router#cdp holdtime 240

Turn off CDP on an interface Router(config-if)#no cdp enable

CDP is enabled globally [CDP is enabled by default] Router(config)# cdp run

Managing Configuration Files

Run the initial configuration dialog Router#setup

Reboot the router and reload the startup config from NVRAM Router#reload

Enter global configuration mode Router#config terminal

Copy configuration file in RAM to NVRAM Router#copy running-config startup-config

Copy configuration file in NVRAM to RAM Router#copy startup-config running-config

Erase the configuration file in NVRAM [run initial config dialog] Router#erase startup-config

Copy startup config file from TFTP to NVRAM Router#copy tftp startup-config

Copy startup config file from NVRAM to TFTP Router#copy startup-config tftp

Copy startup config file from TFTP to RAM Router#copy tftp running-config

Copy running config file from RAM to TFTP Router#copy running-config tftp

Backup IOS to file server Router#copy flash tftp

Upgrade the IOS from the file server Router#copy tftp flash

Tell router which IOS file in Flash to boot from Router(config)# boot system flash (ios_filename)

Tell router which IOS to request from the TFTP server (fallback) Router(config)# boot system tftp (ios_filename) tftp_ip_address

Tell router to boot from IOS in ROM Router(config)# boot rom

Password

Set the enable secret password [to enter privileged mode] Router(config)#enable secret Rimmer

Set the enable password Router(config)#enable Rimmer

Set the password for Telnet Router(config)#line vty 0 4 ;0 4 specifies num of telnet sessions

Router(config-line)#login

Router(config-line)# password Holly

Set the console port password Router(config)#line con 0

Router(config-line)#login

Router(config-line)# password Holly

Set the auxiliary password Router(config)#line aux 0

Router(config-line)#login

Router(config-line)# password Holly

Passwords can be encrypted Routerconfig)#service password-encryption

To de-encrypt the passwords Routerconfig)# no service password-encryption

Router Identification

Message of the day Router(config)# banner motd # You are in… #

Give the router a hostname Router(config)#hostname RouterC

Auto-Install

Router broadcasts to get its own TCP/IP address using BOOTP

Router broadcasts again to locate the file server IP addr using TFTP

Router attempts TFTP to get the IP-to-Hostname mapping file

If above fails, fallback to 8.3 DOS compatible filename conven

Network-confg

Cisconet.cfg

Router attempts TFTP to get its specific Hostname running config

If above fails, fallback to 8.3 DOS compatibile filename conven

{Hostname}-confg

{Hostname}.cfg

Note: {Hostname}is determined by parsing network-confg file and checking all Hostnames listed against own IP address

Configuring a Serial Interface

Is it DCE or DTE? Router#show controller serial 1

Enter sub interface mode Router(config)#interface serial 1

Set clock rate on DCE Router(config-if)#clock rate 64000 [or clockrate 64000]

Set the bandwidth Router(config-if)# bandwidth 64

Enable the interface Router(config-if)#no shutdown

Check interface status Router#show interface serial 1

Router#show ip interface brief

TCP/IP

Disable IP routing on a router (enabled by default) Router(config)#no ip routing

Put an IP address on an interface Router(config)#interface serial 0

Router(config-if)#ip address 172.16.1.3 255.255.0.0

Router(config-if)#exit

Router(config)#interface ethernet 0

Router(config-if)#ip address 208.10.10.3 255.255.255.0

Configure RIP Router(config)# router rip

Router(config-router)#network 157.2.0.0

Router(config-router)#network 177.2.0.0

Disable RIP routing Router(config)# no router rip

Configure IGRP Router(config)# router igrp 300

Router(config-router)#network 157.2.0.0

Router(config-router)#network 177.2.0.0

Disable IGRP routing Router(config)#no router igrp 300

View the IP routing table Router#show ip route

View RIP Debug Router#debug ip rip

View IGRP Debug Router#debug ip igrp events

Router#debug ip igrp transactions

Directory Submission Services

E-Commerce Solutions

Web Solutions Provider

Router Commands