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Introduction to Routing and Packet Forwarding

Learn the basics of configuring a Cisco IOS device using the Command Line Interface (CLI). Topics include addressing, password configuration, banner messaging, interface configuration, and verifying and saving the configuration.

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Introduction to Routing and Packet Forwarding

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  1. Introduction to Routing and Packet Forwarding CLI Configurationand Addressing

  2. Populating an Address Table

  3. Accessing a Cisco IOS DeviceConsole Access Method Most common methods to access the CLI: • Console • Telnet or SSH • AUX port

  4. Basic Router Configuration • When configuring a router, begin with performing certain basic tasks. • Naming the router. • Setting passwords. • Configuring a banner. • Configuring interfaces. • Verifying basic configuration and router operations. • Saving changes on a router.

  5. Basic Router Configuration

  6. Basic Router Configuration

  7. Basic Router Configuration • User and Privileged Modes: • Configure Host Name: Router> user mode Router> enable Router# privilege mode Router# configure terminal Router(config)# exit Router# config t Router(config)# hostname [name]

  8. Basic Router Configuration • Configure Passwords: Privilege password: Router(config)# enable secret [password] Console password: Router(config)# line console 0 Router(config-line)# password [password]Router(config-line)# login Telnet password: Router(config)# line vty 0 4 Router(config-line)# password [password] Router(config-line)# login

  9. Limiting Access to Device ConfigurationsEncrypting Password Display S1(config)#service password-encryption

  10. Basic Router Configuration • Configure Banner Message of the Day: • In the real world, probably a good idea. • Scheduled down time, etc. • In the lab, not necessary unless specifically instructed to do so. Router(config)# banner motd [# message #]

  11. Basic Router Configuration • Configure Interfaces: • Each interface MUST belong to a different network. Router(config)# interface [type][number] Router(config-if)# ip address [address] [mask] Router(config-if)# description [description] Router(config-if)# no shutdown

  12. Basic Router Configuration • Verifying the Configuration: • Saving the Configuration: Router# show running-config Router# show ip route Router# show ip interface brief Router# show interfaces Router# copy running-config startup-config

  13. Basic Router Configuration

  14. Basic Router Configuration – R1 • Configure Host Name: Router> Router>enable Router# Router#configure terminal Router(config)#hostname R1 R1(config#)

  15. Basic Router Configuration – R1 • Configure Privilege Password: R1(config#)enable secret class

  16. Basic Router Configuration – R1 • Configure Passwords: R1(config)#line console 0 R1(config-line)#password cisco R1(config-line)#login R1(config)#line vty 0 4 R1(config-line)#password cisco R1(config-line)#login R1(config-line)#exit R1(config)#service password-encryption

  17. Basic Router Configuration – R1 • Configure Banner Message of the Day: • Enter a text message. End with the character‘#’. R1(config)#banner motd # ****************************************** WARNING!! Unauthorized Access Prohibited!! ****************************************** # R1(config)#

  18. Basic Router Configuration – R1 • WAN Interface Configuration: R1(config)#interface Serial0/0/0 R1(config-if)#ip address 192.168.2.1 255.255.255.0 R1(config-if)#description Link to R2 R1(config-if)#clockrate 64000 (DCE Only) R1(config-if)#no shutdown

  19. Basic Router Configuration – R1 • LAN Interface Configuration: R1(config)#interface FastEthernet0/0 R1(config-if)#ip address 192.168.1.1 255.255.255.0 R1(config-if)#description R1 LAN R1(config-if)#no shutdown

  20. Basic Router Configuration – R1 • Each Interface Belongs to a Separate Network: R1(config)#interface FastEthernet0/1 R1(config-if)#ip address 192.168.1.2 255.255.255.0 192.168.1.0 overlaps with FastEthernet0/0 R1(config-if)#no shutdown 192.168.1.0 overlaps with FastEthernet0/0 FastEthernet0/1: incorrect IP address assignment

  21. The Command StructureHot Keys and Shortcuts • Tab –Completes the remainder of a partially typed command or keyword. • Ctrl-R –Redisplays a line. • Ctrl-A – Moves to the beginning of the line. • Ctrl-Z –Exits the configuration mode and returns to user EXEC. • Down Arrow –Allows the user to scroll forward through former commands. • Up Arrow –Allows the user to scroll backward through former commands. • Ctrl-shift-6 –Allows the user to interrupt an IOS process such as ping ortraceroute. • Ctrl-C – Exits the current configuration or aborts the current command.

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