- Basic Router Commands

Basic Router Commands

How To 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

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

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

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

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

Message of the day Router(config)#	banner motd # You are in… #
Give the router a hostname Router(config)#	hostname RouterC

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

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