1 Pertemuan 5 Configuring a Router

Discussion Topics CLI command modes Configuring a router name Configuring router passwords Examining the show commands Configuring a serial interface Making configuration changes Configuring an Ethernet interface 2

Command-Line Interface Command Modes

Configuring a Router Name

5 Configuring a router name Router#config t Router(config)#hostname Tokyo Tokyo(config)# Mistake… Should be…

Configuring Router Passwords

7 WARNING service password-encryption uses a Cisco Level 7 encryption which is very easy to decrypt. For the GetPass! software However, the enable secret uses a stronger encryption method and cannot be easily hacked. service password-encryption command

8 Examining the show commands show interfaces – Displays all the statistics for all the interfaces on the router. To view the statistics for a specific interface, enter the show interfaces command followed by the specific interface and port number. show controllers serial – Displays information-specific to the interface hardware show clock – Shows the time set in the router show hosts – Displays a cached list of host names and addresses show users – Displays all users who are connected to the router show history – Displays a history of commands that have been entered

Examining the show commands show flash – Displays information about flash memory and what IOS files are stored there show version – Displays information about the router and the IOS that is running in RAM show ARP – Displays the ARP table of the router show protocol – Displays the global and interface specific status of any configured Layer 3 protocols show startup-configuration – Displays the saved configuration located in NVRAM s how running-configuration – Displays the configuration currently running in RAM 9

Examining the show Commands Many show commands can be used to examine the contents of files in the router and for troubleshooting. In both privileged EXEC and user EXEC modes, the command show ? provides a list of available show commands.

Interface Configuration Commands

Configuring an Ethernet Interface

13 show ip interface command A serial interface will not show “up” and “up” unless both ends are properly configured (mostly) and a the no shutdown command is used. If one router’s configuration looks okay, check the other router’s configuration. Router# show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet YES manual up up Serial YES manual administratively down down What is wrong here? The administrator has either done a “shutdown” on the interface or has forgotten to do a “no shutdown”.

14 Lab Real world On serial links that are directly interconnected, as in a lab environment, one side must be considered a DCE and provide a clocking signal. The clock is enabled and speed is specified with the clock rate command. Router(config)#interface serial 0/0 Router(config-if)#clock rate Router(config-if)#no shutdown Configuring a serial interface

Rick Graziani 15 RouterB(config)#inter serial 1 RouterB(config-if)#clock rate ? Speed (bits per second) Choose clockrate from list above RouterB(config-if)#clock rate RouterB(config-if)# RouterB DCE cable RouterA DTE cable Configuring a serial interface

16 How can you tell which end is the DTE and which end is the DCE? Look at the label on the cable. Look at the connecter between the two cables - The DTE cable will always be male and the DCE cable will always be female. DTE CableDCE Cable Configuring a serial interface

17 RouterA#show controllers serial 0 HD unit 0, idb = 0xECA4C, driver structure at 0xF1EC8 buffer size 1524 HD unit 0, V.35 DTE cable cpb = 0x62, eda = 0x403C, cda = 0x4050 RX ring with 16 entries at 0x bd_ptr=0x4000 pak=0x0F5704 ds=0x62FFB8 status=80 pak_size=22 RouterB#show controllers serial 0 buffer size 1524 HD unit 0, V.35 DCE cable, clockrate cpb = 0x62, eda = 0x408C, cda = 0x40A0 RX ring with 16 entries at 0x bd_ptr=0x4000 pak=0x0F2F04 ds=0x status=80 pak_size=22 RouterB DCE cable RouterA DTE cable This is one of few commands where there must be a space between the interface type and the port. Configuring a serial interface

18 Please be very careful when connecting the male and female V.35 cables together AND when connecting the serial cable to the router! They only connect ONE WAY! Be sure the two ends match! Don’t force it! This end up! (The wider end is up.) Configuring a serial interface

19 running-config IOS (running) startup-configIOS ios (partial) Bootup program Executing adds, moves, and changes