120 Labs for Cisco CCNA 200-125 and CCENT Exams

Lab 80: Configuring Multi-Area OSPF

Lab Objective:

The objective of this lab exercise is for you to learn and understand how to enable OSPF using more than one Area.

Lab Purpose:

Enabling Multi-Area OSPF is a fundamental skill. When configuring Multi-Area OSPF, it is imperative to remember that all Areas must be connected to the OSPF backbone area, which is area 0. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to enable Multi-Area OSPF.

Certification Level:

This lab is suitable for ICND2 and CCNA certification exam preparation.

Lab Difficulty:

This lab has a difficulty rating of 8/10.

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 30 minutes.

Lab Topology:

Please use the following topology to complete this lab exercise:

Task 1:

Configure hostnames on R1 and R2 as illustrated in the topology.

Task 2:

Enable the IP addressing scheme as illustrated. The .1 addresses on either end of R1 and R2 are for Loopback0, which makes it easy to test the commands without having to add switches.

Task 3:

Configure area 0 (the backbone area) between R1 and R2 FastEthernet interfaces.

Task 4:

Enable OSPF in area 5 for the network attached to Loopback0 on R1. Enable OSPF in Area 10 for the network attached to Loopback0 attached to R2.

Task 5:

Issue some show commands to check that your configurations have worked.

Configuration and Verification

Task 1:

For reference information on configuring hostnames, please refer to earlier labs.

Task 2:

For reference information on configuring IP addresses, please refer to earlier labs.

Task 3:

R1(config-if)#router ospf 1 
R1(config-router)#network 192.168.1.0 0.0.0.3 area 0 

R2(config)#router ospf 1 
R2(config-router)#net 192.168.1.0 0.0.0.3 area 0 
*Mar  1 00:04:49.211: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on FastEthernet0/0 from LOADING to FULL, Loading Done

Task 4:

R1(config-router)#router ospf 1 
R1(config-router)#net 10.1.1.0 0.0.0.255 area 5 

R2(config-router)#router ospf 1 
R2(config-router)#network 172.16.1.0 0.0.0.255 area 10

Task 5:

R1#show ip route ospf 
   172.16.0.0/32 is subnetted, 1 subnets 
O IA    172.16.1.1 [110/11] via 192.168.1.2, 00:02:09, FastEthernet0/0 

R2#show ip route ospf 
   10.0.0.0/32 is subnetted, 1 subnets 
O IA    10.1.1.1 [110/11] via 192.168.1.1, 00:03:03, FastEthernet0/0

R1#show ip ospf database 

          OSPF Router with ID (10.1.1.1) (Process ID 1) 

      Router Link States (Area 0) 

Link ID         ADV Router      Age       Seq#       Checksum Link count 
10.1.1.1        10.1.1.1       385       0x80000003 0x006DC7 1 
172.16.1.1      172.16.1.1     319       0x80000003 0x00547C 1 

      Net Link States (Area 0) 

Link ID         ADV Router      Age         Seq#       Checksum 
192.168.1.2     172.16.1.1      576         0x80000001 0x00FE47 

      Summary Net Link States (Area 0) 

Link ID         ADV Router      Age         Seq#       Checksum 
10.1.1.1        10.1.1.1        381         0x80000001 0x0080A1 
172.16.1.1      172.16.1.1      315         0x80000001 0x005965 

      Router Link States (Area 5) 

Link ID         ADV Router    Age         Seq#       Checksum Link count 
10.1.1.1        10.1.1.1     385         0x80000001 0x004CBD 1 

      Summary Net Link States (Area 5) 

Link ID         ADV Router      Age         Seq#       Checksum 
172.16.1.1      10.1.1.1        316         0x80000001 0x00ED78 
192.168.1.0     10.1.1.1        389         0x80000001 0x00AF0F 
R1#

NOTE: Understanding the information printed in the OSPF database is key to understanding the operation of OSPF.  The show ip ospf database command shows the router ID of the router this command is issued on, as well as the locally significant OSPF process ID that has been enabled on the router. It also shows the different types of OSPF LSAs and the routes associated with those LSA types, as well as the OSPF Areas.  In addition, each link ID listed in the OSPF database is identified by the originator of the LSA under the column ADV Router.

Related Articles

Subscribe
Notify of
guest

This site uses Akismet to reduce spam. Learn how your comment data is processed.

0 Comments
Inline Feedbacks
View all comments
Back to top button