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OSPF Configuration Sim

June 2nd, 2022 Go to comments

Guidelines
This is a lab item in which tasks will be performed on virtual devices.
+ Refer to the Tasks tab to view the tasks for this lab item.
+ Refer to the Topology tab to access the device console(s) and perform the tasks.
+ Console access is available for all required devices by clicking the device icon or using the
tab(s) above the console window.
+ All necessary preconfigurations have been applied.
+ Do not change the enable password or hostname for any device.
+ Save your configurations to NVRAM before moving to the next item.
+ Click Next at the bottom of the screen to submit this lab and move to the next question.
+ When Next is clicked, the lab closes and cannot be reopened.

Topology

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Tasks

IP connectivity between the three routers is configured. OSPF adjacencies must be established.
1. Configure R1 and R2 Router IDs using the interface IP addresses from the link that is shared
between them.
2. Configure the R2 links with a max value facing R1 and R3. R2 must become the DR. R1 and
R3 links facing R2 must remain with the default OSPF configuration for DR election. Verify the
configuration after clearing the OSPF process.
3. Using a host wildcard mask, configure all three routers to advertise their respective
Loopback1 networks.
4. Configure the link between R1 and R3 to disable their ability to add other OSPF routers.

Solution

You can download the Packet Tracer file of this sim here to practice. Please open it with Packet
Tracer v8.1.1.0022 or newer.

Task 1. Configure R1 and R2 Router IDs using the interface IP addresses from the link that is
shared between them.

R1(config)#router ospf 1
R1(config-router)#router-id 10.10.12.1

R2(config)#router ospf 1
R2(config-router)#router-id 10.10.12.2

Verification

R1#clear ip ospf process

Reset ALL OSPF processes? [no]: y

R1#show ip ospf
Routing Process “ospf 1” with ID 10.10.12.1
…

R2#clear ip ospf process

Reset ALL OSPF processes? [no]: y

R2#show ip ospf
Routing Process “ospf 1” with ID 10.10.12.2

Task 2. Configure the R2 links with a max value facing R1 and R3. R2 must become the DR. R1
and R3 links facing R2 must remain with the default OSPF configuration for DR election. Verify
the configuration after clearing the OSPF process.

The max value of OSPF priority is 255 so we assign this value to E0/0 and E0/2 interfaces of
R2, which are facing R1 & R3.
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On R2:

R2(config)#interface e0/0
R2(config-if)#ip ospf priority 255
R2(config-if)#interface e0/2
R2(config-if)#ip ospf priority 255
R2(config-if)#exit
R2(config)#exit

Verification

This task asks us to clear the OSPF process first:

R2#clear ip ospf process

Reset ALL OSPF processes? [no]: y

and then verify the configuration:

R2#show ip ospf neighbor

10.10.12.1 1 FULL/BDR 00:00:39 10.10.12.1 Ethernet0/0
192.168.3.3 1 FULL/BDR 00:00:39 10.10.23.3 Ethernet0/2

Our configuration is correct if we see our two OSPF neighbors are BDRs so R2 is DR. Or we
can check on R1 & R3 to see R2’s priority and its role. For example on R1:

R1#sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.10.12.2 255 FULL/DR 00:00:37 10.10.12.2 Ethernet0/0
192.168.3.3 1 FULL/DR 00:00:37 10.10.13.3 Ethernet0/1

And on R3:

R3#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.10.12.1 1 FULL/BDR 00:00:37 10.10.13.1 Ethernet0/1
10.10.12.2 255 FULL/DR 00:00:37 10.10.23.2 Ethernet0/2

Task 3. Using a host wildcard mask, configure all three routers to advertise their respective
Loopback1 networks.

This task requires to use “host wildcard mask” so we have to use “0.0.0.0” for the wildcard mask
here. Notice that it is still correct and match the exact Loopback 1 IP addresses only.

R1(config)#router ospf 1
R1(config-router)#network 192.168.1.1 0.0.0.0 area 0

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R2(config)#router ospf 1
R2(config-router)#network 192.168.2.2 0.0.0.0 area 0

R3(config)#router ospf 1
R3(config-router)#network 192.168.3.3 0.0.0.0 area 0

Verification

We can check to see if the Loopback1 networks have been advertised with the “show ip route”
command or the “show ip route ospf” command (this command is same as the first one but it
only shows OSPF learned routes):

R3#show ip route ospf

10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O 10.10.12.0 [110/2] via 10.10.13.1, 00:13:11, Ethernet0/1
[110/2] via 10.10.23.2, 00:13:11, Ethernet0/2
192.168.1.0/32 is subnetted, 1 subnets
O 192.168.1.1 [110/2] via 10.10.13.1, 00:01:08, Ethernet0/1
192.168.2.0/32 is subnetted, 1 subnets
O 192.168.2.2 [110/2] via 10.10.23.2, 00:00:51, Ethernet0/2

-> We can see two other Loopback1 networks so our configuration was correct.

Task 4. Configure the link between R1 and R3 to disable their ability to add other OSPF routers.

Use these commands on both R1 & R3:

R1,R3(config)#interface e0/1
R1,R3(config)#ip ospf network point-to-point

After using these commands on both routers the OSPF process on this segment is up again.

Verification

R3#sh ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.10.12.1 0 FULL/ - 00:00:39 10.10.13.1 GigabitEthernet0/1
10.10.12.2 255 FULL/DR 00:00:30 10.10.23.2 GigabitEthernet0/2

This is a point-to-point network so we cannot add other OSPF routers to R1-R3 segment.

Note: On point-to-point network, the DR/ BDR election process is unnecessary as there can only
be two routers.
Comments (7) Comments

1. bodova
June 5th, 2022

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@9tut at Task 3, for each L1 mask is /24, so wild mask is 0.0.0.255

2. 9tut
June 6th, 2022

@bodova: Task 3 requires to use “host wildcard mask” so we have to use “0.0.0.0” for the
wildcard mask here. Notice that it is still correct and match the exact Loopback 1 IP
addresses only.

3. Madx
August 10th, 2022

Ques 4 solution is disturbing. If the OSPF Network is Broadcast and interfaces R1 and R3
are configured to “Point to Point” won´t that result a ospf missmatch and malfunction?

4. LizBeth
October 2nd, 2022

Does de exam have labs? I just take the Netec course and they told me that the exam didn´t
have any labs questions

5. Perry
December 27th, 2022

@LizBeth Yes the exam have at least 1

6. TomKot
January 30th, 2023

@9tut
in topology above R1 -> Lo1 is 192.168.1.1/24 and Lo0 is 10.10.1/32
in lab note aboe R1 -> Lo0 is 10.10.10.1/24 and Lo1 192.168.1.1/32
in running config R1 -> Lo1 is 192.168.1.1/24 and Lo0 10.10.1.1/32
in my opinion config is correct but wrong note above R1 in pkt

7. 9tut
January 31st, 2023

@TomKot: Thank you for your detection, we updated the note in pkt files!
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