Configuration Example: Basic Router Configuration

Figure A shows the network topology for the configuration that follows, which shows a basic router configuration using the commands covered in this chapter.

Figure A. Network Topology for Basic Router Configuration

Boston Router

Router>en	Enters privileged mode
Router#clock set 18:30:00 15 Nov 2004	Sets local time on router
Router#config t	Enters global config mode
Router(config)#hostname Boston	Sets router name to Boston
Boston(config)#no ip domain-lookup	Turns off name resolution on unrecognized commands (spelling mistakes)
Boston(config)#banner motd #	Creates an MOTD banner
This is the Boston Router.
Authorized Access Only
#
Boston(config)#clock timezone EST 5	Sets time zone to Eastern Standard Time (5 from UTC)
Boston(config)#enable secret cisco	Enables secret password set to cisco
Boston(config)#service password-encryption	Passwords will be given weak encryption
Boston(config)#line con 0	Enters line console mode
Boston(config-line)#logging sync	Commands will not be interrupted by unsolicited messages
Boston(config-line)#password class	Sets password to class
Boston(config-line)#login	Enables password checking at login
Boston(config-line)#line vty 0 4	Moves to virtual Telnet lines 0 through 4
Boston(config-line)#password class	Sets password to class
Boston(config-line)#login	Enables password checking at login
Boston(config-line)#line aux 0	Moves to line auxiliary mode
Boston(config-line)#password class	Sets password to class
Boston(config-line)#login	Enables password checking at login
Boston(config-line)#exit	Moves back to global config mode
Boston(config)#no service password-encryption	Turns off password encryption
Boston(config)#int fa 0/0	Moves to Fast Ethernet 0/0 mode
Boston(config-if)#desc Engineering LAN	Sets locally significant description of the interface
Boston(config-if)#ip address 172.16.10.1 255.255.255.0	Assigns IP address and subnet mask to the interface
Boston(config-if)#no shut	Turns on the interface
Boston(config-if)#int s0/0	Moves directly to Serial 0/0 mode
Boston(config-if)#desc Link to Buffalo Router	Sets locally significant description of the interface
Boston(config-if)#ip address 172.16.20.1 255.255.255.0	Assigns IP address and subnet mask to the interface
Boston(config-if)#clock rate 56000	Sets a clock rate for serial transmission. DCE cable must be plugged into this interface
Boston(config-if)#no shut	Turns on the interface
Boston(config-if)#exit	Moves back to global config mode
Boston(config)#ip host buffalo 172.16.20.2	Sets a local host name resolution to IP address 172.16.20.2
Boston(config)#exit	Moves back to privileged mode
Boston#copy run start	Saves running-config to NVRAM