Cisco labs practical4

1 - 6 CCNA 3: Switching Basics and Intermediate Routing v 3.1 - Lab 2.3.1 Copyright  2003, Cisco Systems, Inc.
Lab 2.3.1 Configuring the OSPF Routing Process
Objective
• Setup an IP addressing scheme for OSPF area 0.
• Configure and verify Open Shortest Path First (OSPF) routing.
Background/Preparation
Cable a network similar to the one shown in the diagram. Any router that meets the interface
requirements displayed on the above diagram may be used. For example, router series 800, 1600,
1700, 2500, and 2600 or any such combination can be used. Please refer to the chart at the end of
the lab to correctly identify the interface identifiers to be used based on the equipment in the lab. The
configuration output used in this lab is produced from 1721 series routers. Any other router used may
produce slightly different output. Perform the following steps on each router unless specifically
instructed otherwise.
Start a HyperTerminal session.
Note: Go to the erase and reload instructions at the end of this lab. Perform those steps on all
routers in this lab assignment before continuing.

Step 1 Configure the routers
On the routers, enter the global configuration mode and configure the hostname as shown in the
chart. Then configure the console, virtual terminal and enable passwords. Next configure the
interfaces according to the chart. Finally, configure the IP hostnames. Do not configure the routing
protocol until specifically told to. If there are any problems configuring the router basics, refer to prior
lab “Review of Basic Router Configuring with RIP”.
Step 2 Save the configuration information from the privileged EXEC command mode
BERLIN#copy running-config startup-config
Destination filename [startup-config]? [Enter]
a. Why save the running configuration to the startup configuration?
__________________________________________________________________________
__________________________________________________________________________
Step 3 Configure the hosts with the proper IP address, subnet mask, and default gateway
a. Each workstation should be able to ping the attached router. Troubleshoot as necessary.
Remember to assign a specific IP address and default gateway to the workstation. If running
Windows 98, check by using Start >Run > winipcfg. If running Windows 2000, check by using
the ipconfig command in a DOS window.
b. At this point the workstations will not be able to communicate with each other. The following
steps will demonstrate the process required to get communication working using OSPF as the
routing protocol.
Step 4 View the routers configuration and interface information
a. At the privileged EXEC mode prompt type:
Berlin#show running-config
b. Using the show ip interface brief command, check the status of each interface.
c. What is the state of the interfaces on each router?
Berlin:
FastEthernet 0: _______________________________________________
Serial 0: ___________________________________________________
Serial 1: ___________________________________________________
Rome:
FastEthernet 0: _______________________________________________
Serial 0: ___________________________________________________
d. Ping from one of the connected serial interfaces to the other.
Was the ping successful? __________________________________________
e. If the ping was not successful, troubleshoot the router configuration, until the ping is successful.

Step 5 Configure OSPF routing on router Berlin
a. Configure an OSPF routing process on router Berlin. Use OSPF process number 1 and ensure
all networks are in area 0.
Berlin(config)#router ospf 1
Berlin(config-router)#network 192.168.1.128 0.0.0.63 area 0
Berlin(config-router)#network 192.168.15.0 0.0.0.3 area 0
Berlin(config-router)#end
b. Examine the routers running configurations files.
c. Did the IOS version automatically add any lines under router OSPF 1? _______________
d. If so, what did it add?
_________________________________________________
e. If there were no changes to the running configuration, type the following commands:
Berlin(config)#router ospf 1
Berlin(config-router)#log-adjacency-changes
Berlin(config-router)#end
f. Show the routing table for the Berlin router.
Berlin#show ip route
g. Are there any entries in the routing table? __________________
h. Why? _______________________________________________________
Step 6 Configure OSPF routing on router Rome
a. Configure an OSPF routing process on router Rome. Use OSPF process number 1 and ensure
all networks are in area 0.
Rome(config)#router ospf 1
Rome(config-router)#network 192.168.0.0 0.0.0.255 area 0
Rome(config-router)#network 192.168.15.0 0.0.0.3 area 0
Rome(config-router)#end
b. Examine the Rome running configuration files.
d. If so, what did it add?
_________________________________________________
Rome(config)#router ospf 1
Rome(config-router)#log-adjacency-changes
Rome(config-router)#end
f. Show the routing table for the Rome router:

Rome#show ip route
g. Are there any OSPF entries in the routing table now? __________________________
h. What is the metric value of the OSPF route? _______________________________
i. What is the VIA address in the OSPF route? _______________________________
j. Are routes to all networks shown in the routing table? __________________________
k. What does the O mean in the first column of the routing table? ____________________
Step 7 Test network connectivity
a. Ping the Berlin host from the Rome host. Was it successful? ___________________
b. If not troubleshoot as necessary.
Once the previous steps are completed, log off by typing exit, and turn the router off. Then remove
and store the cables and adapter.

Erasing and reloading the router
Enter into the privileged EXEC mode by typing enable.
If prompted for a password, enter class. If that does not work, ask the instructor for assistance.
Router>enable
At the privileged EXEC mode, enter the command erase startup-config.
Router#erase startup-config
The responding line prompt will be:
Erasing the nvram filesystem will remove all files! Continue?
[confirm]
Press Enter to confirm.
The response should be:
Erase of nvram: complete
Now at the privileged EXEC mode, enter the command reload.
Router(config)#reload
System configuration has been modified. Save? [yes/no]:
Type n and then press Enter.
Proceed with reload? [confirm]
In the first line of the response will be:
Reload requested by console.
After the router has reloaded the line prompt will be:
Would you like to enter the initial configuration dialog? [yes/no]:
Press RETURN to get started!
Press Enter.
Now the router is ready for the assigned lab to be performed.

Lab 2.3.2 Configuring OSPF with Loopback Addresses
Objective
• Configure routers with a Class C IP addressing scheme.
• Observe the election process for designated routers (DR) and backup designated routers (BDR)
on the multiaccess network.
• Configure loopback addresses for Open Shortest Path First (OSPF) stability.
• Assign each OSPF interface a priority to force the election of a specific router as DR.

On the routers, enter the global configuration mode and configure the hostname as shown in the
chart. Then configure the console, virtual terminal and enable passwords. Next configure the
interfaces according and the IP hostnames. If there are any problems configuring the router basics,
refer to the lab “Review of Basic Router Configuring with RIP”. Do not configure loopback interfaces
and routing protocol yet.
Step 2 Save the configuration information for all the routers
Why save the running configuration to the startup configuration?
__________________________________________________________________________
Step 3 Configure the hosts with the proper IP address, subnet mask and default gateway
Each workstation should be able to ping all of the attached routers. That is because they are all part
of the same subnetwork. Troubleshoot as necessary. Remember to assign a specific IP address and
default gateway to the workstation. If running Windows 98, check by using Start > Run > winipcfg.
If running Windows 2000, check by using the ipconfig command in a DOS window.
a. At the privileged EXEC mode prompt type: show running-config
London:
FastEthernet 0: ________________________________________________________
Serial 0: _____________________________________________________________
Serial 1: _____________________________________________________________
Ottawa:
FastEthernet 0: ________________________________________________________
Serial 0: _____________________________________________________________
Serial 1: _____________________________________________________________
Brasilia:
FastEthernet 0: ________________________________________________________
Serial 0: _____________________________________________________________
Serial 1: _____________________________________________________________
Step 5 Verify connectivity of the routers
a. Ping all of the connected FastEthernet interfaces from each other.
b. Were the pings successful? __________________________________________________
c. If the pings were not successful, troubleshoot the router configuration, until the ping is
successful.

Step 6 Configure OSPF routing on router London
a. Configure an OSPF routing process on the router London. Use OSPF process number 1 and
ensure all networks are in area 0.
London(config)#router ospf 1
London(config-router)#network 192.168.1.0 0.0.0.255 area 0
London(config-router)#end
b. Examine the London router running configuration file.
c. Did the IOS version automatically add any lines under router OSPF 1? ___________________
d. If there were no changes to the running configuration, type the following commands.
London(config)#router ospf 1
London(config-router)#log-adjacency-changes
e. Show the routing table for router:
London#show ip route
f. Are there any entries in the routing table? ___________________
g. Why? __________________________________________________________________
Step 7 Configure OSPF routing on router Ottawa
a. Configure an OSPF routing process on the router Ottawa. Use OSPF process number 1 and
Ottawa(config)#router ospf 1
Ottawa(config-router)#network 192.168.1.0 0.0.0.255 area 0
Ottawa(config-router)#end
b. Examine the Ottawa running configuration file.
c. Did the IOS version automatically add any lines under router OSPF 1? ___________________
d. If there were no changes to the running configuration, type the following commands.
Ottawa(config)#router ospf 1
Ottawa(config-router)#log-adjacency-changes
Step 8 Configure OSPF routing on router Brasilia
a. Configure an OSPF routing process on the router Brasilia. Use OSPF process number 1 and
Brasilia(config)#router ospf 1
Brasilia(config-router)#network 192.168.1.0 0.0.0.255 area 0
Brasilia(config-router)#end

b. Examine the Brasilia router running configuration file.
Did the IOS version automatically add any lines under router OSPF 1? ___________________
c. What did it add? __________________________________________________________
d. If there were no changes to the running configuration, type the following commands:
Brasilia(config)#router ospf 1
Brasilia(config-router)#log-adjacency-changes
a. Ping the Brasilia router from the London router. Was it successful? ___________________
Step 10 Show OSPF adjacencies
a. Type the command show ip ospf neighbor on all routers to verify that the OSPF routing
has formed adjacencies.
b. Is there a designated router identified? __________________________________________
c. Is there a backup designated router? ___________________________________________
d. Type the command show ip ospf neighbor detail for more information.
e. What is the neighbor priority of 192.168.1.1 from router Brasilia? _______________________
f. What interface is Identified as being part of Area 0? _________________________________
Step 11 Configure the loopback interfaces
Configure the loopback interface on each router to allow for an interface that will not go down due to
network change or failure. This task is performed by typing interface loopback # at the global
configuration mode prompt, where the # represents the number of the loopback interface from 0 -
2,147,483,647.
London(config)#interface loopback 0
London(config-if)#ip address 192.168.31.11 255.255.255.255
Ottawa(config)#interface loopback 0
Ottawa(config-if)#ip address 192.168.31.22 255.255.255.255
Brasilia(config)#interface loopback 0
Brasilia(config-if)#ip address 192.168.31.33 255.255.255.255
Step 12 Save the configuration information for all the routers
After saving the configurations on all of the routers, power them down and back up again.

Step 13 Show OSPF adjacencies
a. Type the command show ip ospf neighbor on all routers to verify that the OSPF routing
has formed adjacencies.
b. Is there a designated router identified? __________________________________________
c. Write down the router ID and link address of the DR. _______________ ________________
d. Is there a backup designated router? ___________________________________________
e. Write down the router ID and link address of the BDR. _______________ _______________
f. What is the third router referred to as? __________________________________________
g. Write down that Routers ID and link address. __________________ __________________
h. Type the command show ip ospf neighbor detail for more information.
i. What is the neighbor priority of 192.168.1.1 from router Brasilia? _______________________
j. What interface is Identified as being part of Area 0? _________________________________
Step 14 Verify OSPF interface configuration
a. Type show ip ospf interface fastethernet 0 on the London router.
b. What is the OSPF state of the interface? _________________________________________
c. What is the default priority of the interface? _______________________________________
d. What is the network type of the interface? ________________________________________
Step 15 Configure London to always be the DR
To ensure that the London router always becomes the DR for this multi-access segment, the OSPF
priority must be set. London is the most powerful router in the network and so best suited to become
DR. To assign the London loopback a higher IP address is not advised, as the numbering system
has advantages for troubleshooting. Also London is not to act as DR for all segments to which it may
belong. Set the priority of the interface to 50 on the London router only.
London(config)#interface Fastethernet 0/0
London(config-if)#ip ospf priority 50
London(config-if)#end
Display the priority for Interface fastethernet 0/0.
London#show ip ospf interface fastethernet 0/0
Step 16 Watch election process
a. To watch the OSPF election process restart all of the routers using the reload command. Be
sure to save the running config before restarting the routers. As soon as the router prompt is
available type:
Ottawa>enable
Ottawa#debug ip ospf events
b. Which router was elected DR? ________________________________________________

c. Which router was elected BDR? _______________________________________________
d. Why? __________________________________________________________________
e. To turn off all debugging type undebug all.
Step 17 Show OSPF Adjacencies
a. Type the command show ip ospf neighbor on the Ottawa router to verify that the OSPF
routing has formed adjacencies.
b. What is the priority of the DR? ________________________________________________
Once the previous steps are completed log off by typing exit and turn the router off. Then remove

Lab 2.3.3 Modifying OSPF Cost Metric
Objective
• Setup an IP addressing scheme for Open Shortest Path First (OSPF) area.
• Configure and verify OSPF routing.
• Modify OSPF cost metric on an interface.
On the routers, enter the global configuration mode and configure the hostname, console, virtual
terminal, and enable passwords. Next configure the interfaces and IP hostnames according to the

chart. Do not configure the routing protocol until specifically told to. If there are any problems
configuring the router basics, refer to the lab “Review of Basic Router Configuration with RIP”.
Cairo#copy running-config startup-config
Destination filename [startup-config]?[Enter]
Moscow#copy running-config startup-config
Destination filename [startup-config]?[Enter]
__________________________________________________________________________
Windows 9x/ME, check by using Start > Run > winipcfg. If running Windows NT/2000/XP,
check by using the ipconfig command in a Command Prompt window.
routing protocol.
a. At the privileged EXEC mode type:
Cairo#show running-config
Cairo:
FastEthernet 0: ___________________________________________________________
Serial 0: ________________________________________________________________
Moscow:
FastEthernet 0: ___________________________________________________________
Serial 0: ________________________________________________________________
d. On a router, ping the serial interface of the other router.
e. Was the ping successful? ___________________________________________________
f. If the ping was not successful, troubleshoot the router configuration until the ping is successful.
Step 5 Configure OSPF routing on router Cairo
a. Configure OSPF routing on each router. Use OSPF process number 1 and ensure all networks
are in area 0.
Cairo(config)#router ospf 1
Cairo(config-router)#network 192.168.1.128 0.0.0.63 area 0

Cairo(config-router)#network 192.168.1.0 0.0.0.3 area 0
Cairo(config-router)#end
b. Examine the running configuration file.
c. Did the IOS version automatically add any lines under router OSPF 1? ___________
d. What did it add? __________________________________________________________
Cairo(config)#router ospf 1
Cairo(config-router)#log-adjacency-changes
Cairo(config-router)#end
f. Show the routing table for the Cairo router.
Cairo#show ip route
g. Are there any entries in the routing table? _______________
h. Why? __________________________________________________________
Step 6 Configure OSPF routing on router Moscow
are in area 0.
Moscow(config)#router ospf 1
Moscow(config-router)#network 192.168.0.0 0.0.0.255 area 0
Moscow(config-router)#network 192.168.1.0 0.0.0.3 area 0
Moscow(config-router)#end
b. Examine the running configuration file.
d. If there were no changes to the running configuration, type the following commands:
Moscow(config)#router ospf 1
Moscow(config-router)#log-adjacency-changes
Moscow(config-router)#end
Step 7 Show the routing table entries
a. Show the routing table entries for the Cairo router.
Cairo#show ip route
b. Are there any OSPF entries in the routing table now? _______________________________
c. What is the metric value of the OSPF route? ______________________________________
d. What is the VIA address in the OSPF route? ______________________________________
e. Are routes to all networks shown in the routing table? _______________________________
f. What does the O mean in the first column of the routing table? _________________________

a. Ping the Cairo host from the Moscow host. Was it successful? _________________________
Step 9 Look at the OSPF cost on the Cairo router interfaces
a. Show the properties of the Cairo router serial and FastEthernet interfaces using the show
interfaces command.
b. What is the default bandwidth of the interfaces?
c. Serial Interface: _________________________
d. FastEthernet Interface: _________________________
e. Calculate the cost of a link divide 10
8
by the bandwidth in bps.
f. Serial Interface: _________________________
g. FastEthernet Interface: _________________________
Step 10 Record the OSPF cost of the serial and FastEthernet interfaces
a. Using the show ip ospf interface command, record the OSPF cost of the serial and Fast
Ethernet interfaces.
b. OSPF cost of Serial Interface: _________________________
c. OSPF cost of Ethernet Interface: _________________________
d. Do these agree with the calculations? _________________________
Step 11 Manually set the cost on the serial interface
On the Serial interface of the Cairo router, set the OSPF cost to 1562 by typing ip ospf cost
1562 at the serial interface configuration mode prompt.
Step 12. Verify cost
a. Note that it is essential that all connected links agree about the cost for consistent calculation of
the shortest path first algorithm (SPF) in an area.
b. Verify that the interface OSPF cost was successfully modified.
c. Reverse the effect of this command by entering in interface configuration mode the command no
ip ospf cost.
d. Verify that the default cost for the interface has returned.
Link Bandwidth Default OSPF Cost
56 Kbps 1785
T1 65
10-Mbps 10
16-Mbps Token-ring 6
FDDI/Fast Ethernet 1

e. Enter the command bandwidth 2000 at the serial 0 interface configuration mode.
f. Record the new OSPF cost of the Serial interface. _________________________
g. Can the OSPF cost of an Ethernet interface be modified in this way? ____________________
h. The speed can be set on an Ethernet interface. Will this affect the OSPF cost of that interface?
__________________________________________________________________________
i. Verify or explain the above answer.
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
j. Reset the bandwidth on the serial interface using the no bandwidth 2000 at the serial 0
interface configuration mode.
Once completion previous steps are completed, logoff by typing exit and turn the router off. Then
remove and store the cables and adapters.

Router>enable
[confirm]
Press Enter.

Lab 2.3.4 Configuring OSPF Authentication
Objective
• Setup an IP addressing scheme for Open Shortest Path First (OSPF) area.
• Introduce OSPF authentication into the area.
the lab to correctly identify the interface identifiers to be used based on the equipment in lab. The
terminal and enable passwords. Next configure the interfaces and IP hostnames according to the

Dublin#copy running-config startup-config
Washington#copy running-config startup-config
__________________________________________________________________________
check by using the ipconfig command in a Command Prompt window.
routing protocol.
Step 4 Verify connectivity
a. On a router, ping the serial interface of the other router.
b. What the ping successful? ___________________________________________________
c. If the ping was not successful, troubleshoot the routers configurations, until the ping is
successful.
Step 5 Configure OSPF routing on both routers
are in area 0. Refer to the lab, “Configuring Loopback Interfaces” for review on configuring OSPF
routing if necessary.
b. Examine the Dublin router running configuration file. Did the IOS version automatically add any
lines under router OSPF 1? _____________
c. Show the routing table for the Dublin router.
Dublin#show ip route
d. Are there any entries in the routing table?
e. Why? _________________________________________________________________
a. Ping the Dublin host from the Washington host. Was it successful? _____________

Step 7 Setup up OSPF authentication
a. OSPF authentication is being established on the routers in the network. First, introduce
authentication only on the Dublin router.
b. In the interface configuration mode on Serial 0, enter the command ip ospf message-
digest-key 1 md5 7 asecret.
Dublin(config)#interface Serial 0
Dublin(config-if)#ip ospf message-digest-key 1 md5 ?
<0-7> Encryption type (0 for not yet encrypted, 7 for proprietary)
Dublin(config-if)#ip ospf message-digest-key 1 md5 7 ?
LINE The OSPF password (key)
Dublin(config-if)#ip ospf message-digest-key 1 md5 7 asecret
c. What is the OSPF password being used for md5 authentication? _______________________
d. What encryption type is being used? ____________________________________________
Step 8 Enable OSPF authentication in this area, area 0
Dublin(config-if)#router ospf 1
Dublin(config-router)#area 0 authentication message-digest
a. Wait for a few seconds. Does the router generate any output? _________________
b. Enter the command show ip ospf neighbor.
c. Are there any OSPF neighbors? _________________
d. Examine the routing table by entering show ip route.
e. Are there any OSPF routes in the Dublin router routing table?
f. Can the Dublin host ping the Washington host? _________________
g. Enter these configuration commands, one per line. End with CNTL/Z.
Washington#configure terminal
Washington(config)#interface serial 0
Washington(config-if)#ip ospf message-digest-key 1 md5 7 asecret
Washington(config-if)#router ospf 1
Washington(config-router)#area 0 authentication message-digest
h. Verify that there is an OSPF neighbor by entering show ip ospf neighbor command.
i. Show the routing table by typing show ip route.
j. Ping the Washington host from Dublin. If this was not successful troubleshoot as necessary.
Once the previous steps are completed, log off by typing exit and turn the router off. Then remove

Router>enable
[confirm]
Press Enter.

Lab 2.3.5 Configuring OSPF Timers
Objective
• Setup an IP addressing scheme for OSPF area.
• Modify OSPF interface timers to adjust efficiency of network.
the lab to correctly identify the interface identifiers to be used based on the equipment in lab. The

Sydney#copy running-config startup-config
Rome#copy running-config startup-config
__________________________________________________________________________
Step 3 Configure the hosts with the proper IP address, subnet mask, and default gateway
Windows 9x/ME, check by using Start > Run > winipcfg. If running WindowsNT/2000/XP,
check by using the ipconfig command in a DOS window.
routing protocol.
a. On a router, ping the serial interface of the other router.
b. What the ping successful? ___________________________________________________
c. If the ping was not successful, troubleshoot the router configurations, until the ping is successful.
Step 5 Configure OSPF routing on both routers
are in area 0. Refer to the lab, “Configuring Loopback Interfaces” for review on configuring OSPF
b. Did the IOS version automatically add any lines under router OSPF 1? ___________________
c. Show the routing table for the Sydney router.
Sydney#show ip route
d. Are there any entries in the routing table? ________________________________________
Ping the Sydney host from the Rome host. Was it successful? ___________________________
If not troubleshoot as necessary.

Step 7 Observe OSPF traffic
a. At the privileged EXEC mode type the command debug ip ospf events and observe the
output.
b. How frequently are Hello messages sent? ________________________________________
c. Where are they coming from? ________________________________________________
d. Turn off debugging by typing no debug ip ospf events or undebug all.
Step 8 Show interface timer information
a. Show the hello and dead interval timers on the Sydney router Ethernet and Serial interfaces by
entering the command show ip ospf interface in privileged EXEC mode.
b. Record the Hello and Dead Interval timers for these interfaces
c. Hello Interval: ____________________________________________________________
d. Dead Interval: ____________________________________________________________
e. What is the purpose of the dead interval? ________________________________________
Step 9 Modify the OSPF timers
a. Modify the Hello and Dead-Interval timers to smaller values to try to improve performance. On
the Sydney router only enter the commands ip ospf hello-interval 5 and ip ospf
dead-interval 20 for interface Serial 0.
Sydney(config)#interface Serial 0
Sydney(config-if)#ip ospf hello-interval 5
Sydney(config-if)#ip ospf dead-interval 20
b. Wait for a minute and then enter the command show ip ospf neighbor.
c. Are there any OSPF neighbors? ________________________________________
Step 10 Examine the routing table
a. Examine the Sydney router routing table by entering show ip route.
b. Are there any OSPF routes in the table? ________________________________________
c. Can the Sydney Host ping the Rome host? _______________________________________
Step 11 Look at the OSPF data transmissions.
a. Enter the command debug ip ospf events in privileged EXEC mode.
b. Is there an issue that is identified? ________________________________________
c. If there is, what is the issue? ________________________________________
Step 12 Check the Rome router routing table status.
a. On the Rome router check the routing table by typing show ip route.
b. Are there any OSPF routes in the table? ________________________________________

Step 13 Set the Rome router interval timers
a. Match the timer values on the Rome Serial link with the Sydney router.
Rome(config)#interface serial 0
Rome(config-if)#ip ospf hello-interval 5
Rome(config-if)#ip ospf dead-interval 20
b. Verify the OSPF neighbor by entering show ip ospf neighbor command.
c. Show the routing table by typing show ip route.
d. Are there OSPF routes in the table? ________________________________________
e. Ping the Rome host from Sydney. If this was not successful troubleshoot the configurations.
Step 14 Reset the routers interval timers to the default values
Use the no form of the ip ospf hello-interval and the ip ospf dead-interval to reset
the OSPF timers back to their default values.
Step 15 Verify the interval timers are returned to the default values
a. Use the show ip ospf interface command to verify the timers are reset to their default
values.
b. Are the values back to the default? ________________________________________
c. If not, repeat step 13 and verify again.
Once the previous steps are completed, logoff by typing exit and turn the router off. Then remove

Router>enable
[confirm]
Press Enter.

Lab 2.3.6 Propagating Default Routes in an OSPF Domain
Objective
• Setup an IP addressing scheme for OSPF area.
• Configure and verify Open Shortest Path First (OSPF) routing.
• Configure the OSPF network so that all hosts in OSPF area can connect to outside networks.

Step 1 Configure the ISP router
Normally the ISP router would be configured by the Internet service provider (ISP). For the purpose
of this lab, after erasing the old configuration, configure the ISP router (Router 3) this way by typing:
Router>enable
Router#configure terminal
Router(confi hostname ISPg)#
ISP(config)#line vty 0 4
ISP(config-line)#password cisco
ISP(config-line)#login
ISP(config-line)#interface serial 1
ISP(config-if)#ip address 200.20.20.1 255.255.255.252
ISP(config-if)#clock rate 64000
ISP(config-if)#no shutdown
ISP(config-if)#interface loopback 0
ISP(config-if)#ip address 138.25.6.33 255.255.255.255
ISP(config-if)#exit
ISP(config)#ip route 192.168.1.0 255.255.255.0 200.20.20.2
ISP(config)#ip route 192.168.0.0 255.255.255.0 200.20.20.2
ISP(config)#end
ISP#copy running-config startup-config
Building configuration...
[OK]
ISP#
Step 2 Configure the Area 0 OSPF routers
Tokyo#copy running-config startup-config
Madrid#copy running-config startup-config
__________________________________________________________________________
check by using the ipconfig command in a DOS window.
routing protocol.

a. Ping from the Madrid router to both the Tokyo and the ISP routers.
b. Were the pings successful? __________________________________________________
c. If the ping was not successful, troubleshoot the router configurations, until the ping is successful.
Step 6 Configure OSPF routing on both area 0 routers
are in area 0. Refer to the lab “Configuring loopback interfaces” for review on configuring OSPF
b. Did the IOS version automatically add any lines under router OSPF 1? ___________________
c. Show the routing table for the Tokyo router.
Tokyo#show ip route
d. Are there any entries in the routing table? ________________________________________
a. Ping the Tokyo host from the Madrid host. Was it successful? _________________________
Step 8 Observe OSPF traffic
a. At privileged EXEC mode type the command debug ip ospf events and observe the
output.
b. Is there OSPF traffic? ____________________________
c. Turn off debugging by typing no debug ip ospf events or undebug all.
Step 9 Create a default route to the ISP
On the Madrid router only, type in a static default route through Serial 1 interface.
Madrid(config)#ip route 0.0.0.0 0.0.0.0 200.20.20.1
Step 10 Verify the default static route
a. Verify the default static route by looking at the Madrid routing table.
b. Is the default route in the routing table? ____________________________
Step 11 Verify connectivity from the Madrid router
a. Verify connectivity from the Madrid router by pinging the ISP Serial 1 interface from the Madrid
router.
b. Can the interface be pinged? _________________________________________________
c. Next, on the host attached to Madrid, open a Command Prompt and ping the serial 1 interface
on the ISP router.
d. Can the interface be pinged? _________________________________________________
e. This time, ping the loopback address of the ISP router, which represents the ISP connection to
the Internet.

f. Can the loopback interface be pinged? __________________________________________
g. All of these pings should be successful. If they are not, troubleshoot the configurations on the
host and the Madrid and ISP routers.
Step 12 Verify connectivity from the Tokyo router
a. Verify the connection between the ISP and the Tokyo by pinging the serial 1 interface of the ISP
router on the Tokyo router.
b. Can the interface be pinged? _________________________________________________
c. If yes, why? If not, why not? __________________________________________________
Step 13 Redistribute the static default route
a. Propagate the gateway of last resort to the other routers in the OSPF domain. At the configure
router prompt on the Madrid router type default-information originate.
Madrid(config-router)#default-information originate
b. Is there now a default route on the Tokyo router? __________________________________
c. What is the address of the Gateway of last resort? _________________________________
d. There is an O*E2 entry in the routing table. What type of route it is? _____________________
e. Can the ISP server address at 138.25.6.33 be pinged from both workstations? ____________
f. If no, troubleshoot both hosts and all three routers.
Once the previous steps are completed, log off by typing exit and turn the router off. Then remove

Router>enable
[confirm]
Press Enter.

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