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All slides are customized by Engr. Vernon Degala. For educational purposes only.All slides are customized by Engr. Vernon Degala. For educational purposes only.
Module 3: Configuring a Router
inspired by Cisco Networking Academy Computer Networks and Security CCNA 2: Routers and Routing Basics
ORIGINAL COPY
All slides are customized by Engr. Vernon Degala. For educational purposes only.
Overview
Some commands
• To go back a level - type exit
• To return to privileged EXEC mode – Press Ctrl-Z
• To execute a command – Press Enter / Return
• Enter privileged EXEC mode – Router > enable
• Enter global configuration mode – Router#configure terminal
• Enter hostname – Router(config)#hostname Tokyo
• Return to configuration mode: Tokyo(config)#exit then Tokyo#
All slides are customized by Engr. Vernon Degala. For educational purposes only.
Show commands
- Router# Show?
- To display all show commands
- Router#show interfaces
- Displays statistics for all router interfaces
- Router#show interfaces serial 0/
- Displays statistics for serial 0/1 interface only
- Router#show controllers serial
- Displays information-specific to the interface hardware
- Router#show clock
- Shows the time set in the router
- Router#show hosts
- Displays a cached list of host names and addresses
- Router#show users
- Displays all users who are connected to the router
- Router#show history
- Displays a history of commands that were entered
- Router#show flash
- Displays information about flash memory
- Displays what IOS files are stored there
- Router#show protocol
- Displays status of any configured Layer 3 protocols
- Router#show startup-configuration
- Displays the saved configuration in NVRAM
- Router#show running-configuration
- Displays the configuration currently running in RAM
Configuring Serial and Ethernet Ports
• Both can be configured from console port or through a virtual terminal line (telnet)
Enter global configuration mode Router#config t Enter interface serial mode Router(config)#int s0/ Specify the interface ip address and subnet mask Router(config-if)#ip address If DCE cable set clock rate and bandwidth (not DTE) Router(config-if)#clock rate 56000 Router(config-if)#bandwidth 64 Turn on the interface Router(config-if)#no shutdown Save changes from RAM to NVRAM Router#copy running-config startup-config Save changes from RAM to TFTP server Router#copy running-config tftp Examine running configuration in RAM Router#show running-config Examine startup configuration in NVRAM Router#show start
All slides are customized by Engr. Vernon Degala. For educational purposes only.
To Make Changes
- Use the word NO
- To turn off the ip address and subnet mask
- Router(config-if)#no ip address
- To turn off the bandwidth
- Router(config-if)#no bandwitdh
- To turn off the clock rate
- Router(config-if)#no clockrate
- To turn on or enable an interface
- Router(config-if)#no shutdown
- To turn off or disable an interface
- Router(config-if)#shutdown
- Copy from RAM to TFTP server
- Router#copy running-config tftp
- Restore from TFTP to RAM
- Router#copy tftp running- config
- Force router to use the original configuration file in NVRAM
- Router#copy startup-config running-config
- Force router to use the configuration file on the tftp server
- Router#copy tftp running-config
- Erase the startup configuration file from NVRAM
- Router#write erase OR - Router#erase start
- Router#reload - Router#reload
- Steps to configure host names
- Router(config)#ip host Lab_A 172.51.1.
- Router(config)#ip host Lab_B 180.101.21.
