E-Lab 7.2.7 - Preventing Routing Updates Through an Interface
In this lab, you will learn to prevent routing updates through an interface to regulate advertised routes and observe the results.
Step 1.1
Enter into privileged EXEC mode.
Step 1.2
Enter into global configuration mode.
Step 2
Set the hostname to Doha.
Step 3.1
Enter line configuration mode for the console.
Step 3.2
Set the console password to cisco.
Step 3.3
Use the login command.
Step 3.4
Go back to global configuration mode using the exit command.
Step 4.1
Enter line configuration mode for virtual terminals 0 through 4.
Step 4.2
Enter password for virtual terminals to cisco.
Step 4.3
Enter the login command.
Step 4.4
Go back to global configuration mode using the exit command.
Step 5
Set enable password class.
Step 6.1
Enter router configuration mode for RIP.
Step 6.2
Add network address 192.168.15.0.
Step 6.3
Add network address 192.168.14.0.
Step 6.4
Use the command end to exit into privileged EXEC mode.
Step 7
Enter global configuration mode.
Step 8.1
Enter interface configuration mode for serial 0.
Step 8.2
Configure the IP address for Serial 0 as 192.168.15.1 255.255.255.0.
Step 8.3
Set the clockrate to 56000.
Step 8.4
Bring the interface up.
Step 8.5
Use the command end to exit into privileged EXEC mode.
Step 9
Save your configuration.
Step 10.1
Change over to the second router.
Enter privileged EXEC mode on Manama.
Step 10.2
Enter into global configuration mode.
Step 11
Enter hostname Manama.
Step 12.1
Enter line configuration mode for the console.
Step 12.2
Enter password for console cisco.
Step 12.3
Enter the login command.
Step 12.4
Go back to global configuration mode using the exit command.
Step 13.1
Enter line configuration mode for virtual terminals 0 through 4.
Step 13.2
Enter password for virtual terminal cisco.
Step 13.3
Enter the login command.
Step 13.4
Go back to global configuration mode using the exit command.
Step 14
Set the enable password to class.
Step 15.1
Enter router configuration mode for RIP.
Step 15.2
Add network address 192.168.15.0
Step 15.3
Add network address 192.168.16.0
Step 15.4
Use the command end to exit into privileged EXEC mode.
Step 16
Enter global configuration mode.
Step 17.1
Enter interface configuration mode for serial 0.
Step 17.2
Configure the IP address for Serial 0 as 192.168.15.2 255.255.255.0.
Step 17.3
Bring the interface up.
Step 17.4
Use the command end to exit into privileged EXEC mode.
Step 18
Save your configuration.
Step 19
Check the basic routing configuration.
Enter the show ip protocol command on each router.
Step 20
Use the show ip route command to see directly connected networks and also routes learned through RIP.
Step 21
From the Doha router, use the debug ip rip command to verify that the router is sending updates out the interface to the Manama router.
Step 22
Turn off all debugging
Step 23
On the console session for the Doha router, enter global configuration mode.
Step 24.1
Enter router configuration mode by entering the command router rip.
Step 24.2
Enter the command passive-interface serial 0.
This will prevent the Doha router from advertising its routes to the Manama router.
Step 24.3
Use the command end to exit into privileged EXEC mode.
Step 25
To confirm the routing updates have been stopped, use the debug ip rip events command on the Doha router.
Verify from the output that the router is not sending updates out the interface to the Manama router.
Step 26
Notice that no updates were sent over serial 0.
Now disable the debug output with the undebug all command.
Step 27
From the Manama router, issue the show ip route command.
Step 28
Confirm that the Manama router is still sending updates to Doha.
To do this, use the debug ip rip events command on the Manama router.
Verify from the output that the router is sending updates out the interface to the Doha router.
Step 29
Disable the debug output with the undebug all command.
Step 30
Since Manama is not getting routing updates, it does not have a router the outside world.
It needs to be provided with a default route.
A default route is the route that data is sent out if the routing table does not have a specific route to use.
First enter global configuration mode.
Step 31.1
Enter a default static route to router Doha with the command ip route 0.0.0.0 0.0.0.0 192.168.15.1.
Step 31.2
Exit to privileged EXEC mode.
Step 32
Verify the default route is in the Manama routing table by issuing the show ip route command.