OSPF Multi-Area Configuration and Summary Routes

Note: In OSPF multi-area more than one area is used to configure and in this lab you will see how we configure multi-area OSPF configure in Packet Tracer.

OSPF Multi-Area Configuration

How to Configure OSPF Multi-Area

Configuring the Router R1 Interfaces

Router> enable

Router# configure terminal

Enter configuration commands, one per line. End with CNTL / Z.

Router (config) # hostname R1

R1 (config) # interface serial 0/1/0

R1 (config-if) # ip address 6.0.0.1 255.0.0.0

R1 (config-if) #encapsulation hdlc

R1 (config-if) #clock rate 64000

R1 (config-if) #keepalive 12

R1 (config-if) #no shutdown

%LINK-5-CHANGED: Interface Serial0/1/0, changed state to down

R1 (config-if) #exit

R1 (config) # interface fastethernet0/0

R1 (config) # int fa0/0

R1 (config-if) # ip address 4.0.0.10 255.0.0.0

R1 (config-if) #no shutdown

Interface Status up

R1 (config-if) #end

R1#

Configuring the Router R2 Interfaces

Router> enable

Router# configure terminal

Enter configuration commands, one per line. End with CNTL / Z.

Router (config) # hostname R2

R2 (config) # interface serial 0/1/0

R2 (config-if) # ip address 6.0.0.2 255.0.0.0

R2 (config-if) #encapsulation hdlc

R2 (config-if) #keepalive 12

R2 (config-if) #no shutdown

Interface Status up

R2 (config-if) #exit

R2 (config) # interface fastethernet0/0

R2 (config) # int fa0/0

R2 (config-if) # ip address 5.0.0.10 255.0.0.0

R2 (config-if) #no shutdown

Interface Status up

R2 (config-if) #end

R2#

Router R1 and R2 Routing Table

Router R1

R1# show ip route

IP Route Status

R1#

Note: By default, in the router R1 routing table the two associated interfaces and directly connected networks are listed.

Router R2

R2# show ip route

IP Route Status

R2#

Note: By default, in the router R2 routing table the two associated interfaces and directly connected networks are listed.

Ping Verification on Router R1 and R2

Router R1

R1#ping 6.0.0.2

Successful Ping Verification

R1#ping 5.0.0.10

Unsuccessful Ping Verification

R1#

Note: The ping was not successful because the network 5.0.0.0 is not listed in the router R1 routing table. Using the OSPF the network 5.0.0.0 needs to be put in the R1 routing table.

Router R2

R2#ping 6.0.0.1

Successful Ping Verification

R2#

R2#ping 4.0.0.10

Unsuccessful Ping Verification

R2#

Note: The ping was not successful because the network 4.0.0.0 is not listed in the router R2 routing table. Using the OSPF the network 4.0.0.0 needs to be put in the R2 routing table.

Configuring OSPF on Router R1 and R2

Router R1

R1#configure terminal

R1 (config) # router ospf?

<1-65535> Process ID

R1 (config) # router ospf 14

R1 (config-router) #network 4.0.0.0 0.255.255.255 area 0

R1 (config-router) #network 6.0.0.0 0.255.255.255 area 0

R1 (config-router) #end

R1#

Router R2

R2#configure terminal

R2 (config) # router ospf 14

R2 (config-router) #network 6.0.0.0 0.255.255.255 area 0

OSPF Neighborship

R2 (config-router) #network 5.0.0.0 0.255.255.255 area 1

R2 (config-router) #end

R2#

Router R1 and R2 Routing Table

Router R1

R1#show ip route

IP Route Status

R1#

Router R2

R2#show ip route

IP Route Status

R2#

Ping Verification on Routers R1 and R2

Router R1

R1#ping 5.0.0.10

Successful Ping Verification

R1#

Router R2

R2#ping 4.0.0.10

Successful Ping Verification

R2#

Summary Routes

Router R1

R1#show ip ospf neighbor

OSPF Neighborship

Router R2

R2#show ip ospf neighbor

OSPF Neighborship

R2#

R2#show ip ospf

OSPF Area Status

Building LSDB (Link-state Database)

Building LSDB

The OSPF builds the LSDB and it is the information found in Link-state Advertisements (LSAs). In the same area between the routers, the LSDB is synchronized.

v The Hello protocol is used to define the neighbors, and in the network the hello protocol allows each router to check whether it can exchange messages with neighboring routers in the network.
v Adjacency is established which means it refers to the connected neighbor’s status.
v Adjacent routers exchange LSAs. The LSAs are messages communicated to other routers in the OSPF domain via multicast. It is used to exchange topology information and it contains each directly connected link cost and state.

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