router - pt 2
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Programming the ports. The router has three ports (e0, s0 and s1). One of the most important things to set on the router is the IP address of each of the ports. These ports will be used as gateways out of the network segment to which they connect to. The interface command (or int for short) programs each of the interfaces. In the following example, the three ports on the router are programmed with the required IP addresses, and subnet masks. The ports will not automatically come on-line, and will start in a shutdown mode. Thus the no shutdown command is used to start them up. They are programmed with:

1

Go to Priv Exec mode

2

Enter config t command.

3

Enter interface e0 command to program the ethernet 0 port.

4

Enter ip address 192.5.5.1 255.255.255.0 command.

5

Enter no shutdown command.

6

Enter exit command.

7

Enter interface s0 command to program the serial 0 port.

8

Enter ip address 205.7.5.1 255.255.255.0 command.

9

Enter no shutdown command.

10

Enter exit command.

11

Enter interface s1 command to program the serial 1 port.

12

Enter ip address 201.100.11.1 255.255.255.0 command.

13

Enter clock rate 56000 command to set the clock rate of the serial port to 56kbps.

13

Enter no shutdown command.

14

Enter exit command.

15

Enter show protocols command to see if the IP addresses have been changed, and that the ports are now active (that is, "UP").

Other interface commands include:

keepalive 10- Set the time interval for the keepalive signal (in this case to 10 seconds).
bandwidth 64- Set the bandwidth on the port (in this case to 64 kbps).

Ping'ing the ports. The show protocols command shows if the ports are UP, but the best way to really test them is to use the ping command.

1

Go to Priv Exec mode

2

Enter ping 192.5.5.1 and provide that the port is alive.

2

Enter ping 205.7.5.1 and provide that the port is alive.

2

Enter ping 201.100.11.1 and provide that the port is alive.

7

Enter interface e0 command to program the serial 0 port.

8

Enter shutdown command.

9

Enter exit command.

7

Enter interface s0 command to program the serial 0 port.

8

Enter shutdown command.

9

Enter exit command.

7

Enter interface s1 command to program the serial 0 port.

8

Enter shutdown command.

9

Enter exit command.

2

Enter ping 192.5.5.1 and provide that the port is not alive.

2

Enter ping 205.7.5.1 and provide that the port is not alive.

2

Enter ping 201.100.11.1 and provide that the port is not alive.

Setting a routing protocol to RIP. The router will not be able to connect to other routers unless it runs a routing protocol which is the same as the other routers. This allows the routers to determine the best path to a remote device. In this case the RIP protocol is set-up with the router rip command, and then each of the networks in which the router will broadcast its routing table are defined (using the network command). RIP is one of the most widely used routing protocols, and measures the best route by the number of hops that it takes to get to a destination.

1

Go to Priv Exec mode

2

Enter config t command.

3

Enter router rip command to define the RIP protocol.

4

Enter network 192.5.5.0 command.

5

Enter network 205.7.5.0 command.

6

Enter network 201.100.11.0 command.

7

Enter exit command.

8

Enter exit command.

9

Enter show running-config command to see if the networks have been added.

Removing a network. Often it is not required that the routing table is broadcast into some of the connected networks, thus to remove a network:

1

Go to Priv Exec mode

2

Enter config t command.

3

Enter router rip command.

4

Enter no network 205.7.5.0 command.

5

Enter exit command.

6

Enter exit command.

7

Enter show running-config command to see if the networks have been deleted.

Setting a routing protocol to IGRP. IGRP is an improvement on RIP, and it based on an AS (Autonomous System) number.

1

Go to Priv Exec mode

2

Enter config t command.

3

Enter router igrp 111 command, where 111 is the AS number.

4

Enter network 192.5.5.0 command.

5

Enter network 205.7.5.0 command.

6

Enter network 201.100.11.0 command.

7

Enter exit command.

8

Enter exit command.

9

Enter show running-config command to see if the networks have been added.

Setting the name server.

1

Go into the privileged mode by typing enable.

3

Configure the device using by typing config t.

4

From the config mode,set the domain-name is mycomp.com, the name-server to 192.168.0.10, using:

(config)# ip domain-name mycomp.com
(config)# ip name-server 192.168.0.10

5

Go back to the user executive mode with the command exit.

6

Show the main system configuration with show running-config.

Setting up host names. Apart from setting up a name server, it is also possible to assign names localling in a hosts table. These map domain names to associated IP addresses.

1

Go into the privileged mode by typing enable.

3

Configure the device using by typing config t.

4

From the config mode, set the host names with:

(config)# ip host LAB_A 192.5.5.1 205.7.5.1 201.100.11.1
(config)# ip host LAB_B 201.100.11.2 219.17.100.1 199.6.13.1
(config)# ip host LAB_C 223.8.151.1 204.204.7.1
(config)# ip host LAB_D 210.93.105.1 204.204.7.2
(config)# ip host LAB_E 210.93.105.2

5

Go back to the user executive mode with the command exit.

6

Show the main system configuration with show running-config.

7

Show the hosts configuration with show hosts.

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