1 pertemuan 5 configuring a router. discussion topics cli command modes configuring a router name...
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Pertemuan 5 Configuring a Router
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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
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Command-Line InterfaceCommand Modes
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Configuring a Router Name
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Configuring a router name
Router#config t
Router(config)#hostname Tokyo
Tokyo(config)#
Mistake…
Should be…
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Configuring Router Passwords
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WARNING• service password-encryption uses a Cisco Level 7
encryption which is very easy to decrypt.• For the GetPass! software www.boson.com• However, the enable secret <password> uses a stronger
encryption method and cannot be easily hacked.
service password-encryption command
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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
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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 • show running-configuration – Displays the
configuration currently running in RAM
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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.
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Interface Configuration Commands
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Configuring an Ethernet Interface
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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
Ethernet0 131.108.1.11 YES manual up up
Serial0 198.135.2.49 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”.
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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 56000
Router(config-if)#no shutdown
Configuring a serial interface
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Rick Graziani [email protected]
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RouterB(config)#inter serial 1RouterB(config-if)#clock rate ? Speed (bits per second) 1200 2400 4800 9600 19200 38400 56000 64000 <text omitted> 2000000 4000000
<300-4000000> Choose clockrate from list above
RouterB(config-if)#clock rate 64000RouterB(config-if)#
RouterB DCE cable
RouterA DTE cable
Configuring a serial interface
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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 Cable DCE Cable
Configuring a serial interface
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RouterA#show controllers serial 0HD unit 0, idb = 0xECA4C, driver structure at 0xF1EC8buffer size 1524 HD unit 0, V.35 DTE cablecpb = 0x62, eda = 0x403C, cda = 0x4050RX ring with 16 entries at 0x62400000 bd_ptr=0x4000 pak=0x0F5704 ds=0x62FFB8 status=80 pak_size=22
RouterB#show controllers serial 0buffer size 1524 HD unit 0, V.35 DCE cable, clockrate 64000cpb = 0x62, eda = 0x408C, cda = 0x40A0RX ring with 16 entries at 0x62400000 bd_ptr=0x4000 pak=0x0F2F04 ds=0x627908 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
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• 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
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running-config
IOS (running)
startup-config IOS
ios (partial)Bootup program
Executing adds, moves, and changes