hamdy_dc
27-04-2009, 15:19
Basic Router Operation
User Mode
Router >
Moves user from user mode to privileged mode
Router > enable
Router #
Moves you from privileged mode back to user mode
Router # disable
Router >
Logs a user off
Router > exit or logoff
Performs the same function as exit
Router#logout
Moves you back one level
Router(config-if)#exit
Router (config)#
Moves you back one level
Router(config)#exit
Router#
Enters startup mode from the command line
Router#setup
Previous command à using up arrow or Ctrl + P
Next command à using down arrow or Ctrl + N
Move forward one character à using right arrow or Ctrl + F
Move Backward one character à using left arrow or Ctrl + B
Break key à Shift + Ctrl + 6
Auto complete command à Tab
__________________________________________________ ___________
Viewing router information
Ios version inf. à show version
Current config (RAM) à show running config
Saved config (NVRAM) à show startup config
IOS file and free space à show flash
Processor utilization à show processes cpu
Router#show version
Displays information about current IOS
Router#show flash
Displays information about Flash memory
Router#show history
Lists all commands in the history buffer
__________________________________________________ ___________
Configuring the router
From the terminal session (keyboard) to running (RAM) à configure terminal
From Tftp (file server) to running (RAM) à copy tftp running config
From saved config (NVRAM) to running (RAM) à copy startup config running config
Upgrade the IOS from file server à copy tftp flash
Save backup copy of IOS to file server à coy flash tftp
Save your configuration (from RAM) to non- volatile RAM (NVRAM) à copy running config startup config
Tell the router which IOS file in Flash to boot from à boot system flash (filename)
Tell the router which IOS file to request from TFTP (fallback) à boot system tftp (filename )
____________________________________________
Set a Password
Router(config)#enable password cisco
Sets enable password
Router(config)#enable secret class
Sets enable secret password
Router(config)#line con 0
Router(config-line)#password console
Router(config-line)#login
Enters console-line mode
Sets console-line mode password to console
Enables password checking at login
Router(config)#line vty 0 4
Router(config-line)#password telnet
Router(config-line)#login
Enters vty line mode for all five vty lines
Sets vty password to telnet
Enables password checking at login
Router(config)#line aux 0
Router(config-line)#password backdoor
Router(config-line)#login
Enters auxiliary line mode
Sets auxiliary line mode password to backdoor
Enables password checking at login
Password Encryption
Router(config)#service password-encryption
Applies a weak encryption to passwords
Router(config)#enable password cisco
Sets enable password to cisco
Router(config)#line con 0
...
Router(config-line)#password Cisco
Continue setting passwords as above
...
Router(config)#no service password-encryption
Turns off password encryption
Set password for Console port à Line console 0
Login
Password cisco
Set password for Telnet à Line vty 0 4
Login
Password class
Set password for Priveledge mode à enable password cisco
Set encrypted password for Priveledge mode à enable password cisco
__________________________________________________ _____
Router Modes
Router>
User mode
Router#
Privileged mode
Router(config)#
Global configuration mode
Router(config-if)#
Interface mode
Router(config-subif)#
Subinterface mode
Router(config-line)#
Line mode
Router(config-router)#
Router configuration mode
__________________________________________________ _______________________________________________
Configuring a Router Name
Name can be any word you choose
Router(config)#hostname Cisco
Cisco(config)#
__________________________________________________ _______
show Commands
Router#show ?
Lists all show commands available
Router#show interfaces
Displays statistics for all interfaces
Router#show interface serial 0
Displays statistics for a specific interface, in this case Serial 0
Router#show ip interface brief
Displays a summary of all interfaces, including status and IP address assigned
Router#show controllers serial 0
Displays statistics for interface hardware. Statistics display if the clock rate is set and if the cable is DCE, DTE, or not attached
Router#show clock
Displays time set on device
Router#show hosts
Displays local host-to-IP address cache. These are the names and addresses of hosts on the network to which you can connect
Router#show users
Displays all users connected to device
Router#show history
Displays history of commands used at this edit level
Router#show flash
Displays info about Flash memory
Router#show version
Displays info about loaded software version
Router#show arp
Displays the ARP table
Router#show protocols
Displays status of configured Layer 3 protocols
Router#show startup-config
Displays configuration saved in NVRAM
Router#show running-config
Displays configuration currently running in RAM
User Mode
Router >
Moves user from user mode to privileged mode
Router > enable
Router #
Moves you from privileged mode back to user mode
Router # disable
Router >
Logs a user off
Router > exit or logoff
Performs the same function as exit
Router#logout
Moves you back one level
Router(config-if)#exit
Router (config)#
Moves you back one level
Router(config)#exit
Router#
Enters startup mode from the command line
Router#setup
Previous command à using up arrow or Ctrl + P
Next command à using down arrow or Ctrl + N
Move forward one character à using right arrow or Ctrl + F
Move Backward one character à using left arrow or Ctrl + B
Break key à Shift + Ctrl + 6
Auto complete command à Tab
__________________________________________________ ___________
Viewing router information
Ios version inf. à show version
Current config (RAM) à show running config
Saved config (NVRAM) à show startup config
IOS file and free space à show flash
Processor utilization à show processes cpu
Router#show version
Displays information about current IOS
Router#show flash
Displays information about Flash memory
Router#show history
Lists all commands in the history buffer
__________________________________________________ ___________
Configuring the router
From the terminal session (keyboard) to running (RAM) à configure terminal
From Tftp (file server) to running (RAM) à copy tftp running config
From saved config (NVRAM) to running (RAM) à copy startup config running config
Upgrade the IOS from file server à copy tftp flash
Save backup copy of IOS to file server à coy flash tftp
Save your configuration (from RAM) to non- volatile RAM (NVRAM) à copy running config startup config
Tell the router which IOS file in Flash to boot from à boot system flash (filename)
Tell the router which IOS file to request from TFTP (fallback) à boot system tftp (filename )
____________________________________________
Set a Password
Router(config)#enable password cisco
Sets enable password
Router(config)#enable secret class
Sets enable secret password
Router(config)#line con 0
Router(config-line)#password console
Router(config-line)#login
Enters console-line mode
Sets console-line mode password to console
Enables password checking at login
Router(config)#line vty 0 4
Router(config-line)#password telnet
Router(config-line)#login
Enters vty line mode for all five vty lines
Sets vty password to telnet
Enables password checking at login
Router(config)#line aux 0
Router(config-line)#password backdoor
Router(config-line)#login
Enters auxiliary line mode
Sets auxiliary line mode password to backdoor
Enables password checking at login
Password Encryption
Router(config)#service password-encryption
Applies a weak encryption to passwords
Router(config)#enable password cisco
Sets enable password to cisco
Router(config)#line con 0
...
Router(config-line)#password Cisco
Continue setting passwords as above
...
Router(config)#no service password-encryption
Turns off password encryption
Set password for Console port à Line console 0
Login
Password cisco
Set password for Telnet à Line vty 0 4
Login
Password class
Set password for Priveledge mode à enable password cisco
Set encrypted password for Priveledge mode à enable password cisco
__________________________________________________ _____
Router Modes
Router>
User mode
Router#
Privileged mode
Router(config)#
Global configuration mode
Router(config-if)#
Interface mode
Router(config-subif)#
Subinterface mode
Router(config-line)#
Line mode
Router(config-router)#
Router configuration mode
__________________________________________________ _______________________________________________
Configuring a Router Name
Name can be any word you choose
Router(config)#hostname Cisco
Cisco(config)#
__________________________________________________ _______
show Commands
Router#show ?
Lists all show commands available
Router#show interfaces
Displays statistics for all interfaces
Router#show interface serial 0
Displays statistics for a specific interface, in this case Serial 0
Router#show ip interface brief
Displays a summary of all interfaces, including status and IP address assigned
Router#show controllers serial 0
Displays statistics for interface hardware. Statistics display if the clock rate is set and if the cable is DCE, DTE, or not attached
Router#show clock
Displays time set on device
Router#show hosts
Displays local host-to-IP address cache. These are the names and addresses of hosts on the network to which you can connect
Router#show users
Displays all users connected to device
Router#show history
Displays history of commands used at this edit level
Router#show flash
Displays info about Flash memory
Router#show version
Displays info about loaded software version
Router#show arp
Displays the ARP table
Router#show protocols
Displays status of configured Layer 3 protocols
Router#show startup-config
Displays configuration saved in NVRAM
Router#show running-config
Displays configuration currently running in RAM