07 – OSPF Multi-Area Configuration

Mo7sin 01/04/2012 2,959 9,526 views

OSPF is an open standard protocol and not relate to any particular vendor. OSPF propagate the changes to all networks more quickly as compare to RIP, IGRP protocols and only send the changed part of the routing table to the other routers with in their area. We can decrease the size of routing table by dividing a big network into logically small segment using its area feature. When you used OSPF for multiple areas, its configuration method is differs from the RIP and IGRP.

There are some common OSPF configuration and Executable commands:

OSPF configuration on Router A

In global configuration mode

Router-A(config) # router ospf 10  (Here 10 indicate the process identification number)

Router-A(config-Router) # network 1.0.0.0 0.255.255.255 area 0 (Here 1.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 0)

Router-A(config-Router) # network 3.0.0.0 0.255.255.255 area 2 (Here 3.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 2)

Router-A(config-Router) # network 192.168.1.0 0.0.0.255 area 2 (Here 192.168.1.0 indicate the network ID and 0.0.0.255 wildcard mask with area 2)

OSPF configuration on Router B

In global configuration mode

Router-B(config) # router ospf  20  (Here 20 indicate the process identification number)

Router-B(config-Router) # network 1.0.0.0 0.255.255.255 area 0 (Here 1.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 0)

Router-B(config-Router) # network 2.0.0.0 0.255.255.255 area 0 (Here 2.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 0)

Router-B(config-Router) # network 192.168.2.0 0.0.0.255 area 0 (Here 192.168.2.0 indicate the network ID and 0.0.0.255 wildcard mask with area 0)

OSPF configuration on Router C

In global configuration mode

Router-C(config) # router ospf 30  (Here 30 indicate the process identification number)

Router-C(config-Router) # network 3.0.0.0 0.255.255.255 area 2 (Here 3.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 2)

Router-C(config-Router) # network 2.0.0.0 0.255.255.255 area 0 (Here 2.0.0.0 indicate the network ID and 0.225.255.255 wildcard mask with area 0)

Router-C(config-Router) # network 192.168.3.0 0.0.0.255 area 1 (Here 192.168.3.0 indicate the network ID and 0.0.0.255 wildcard mask with area 1)

Now on all routers each Network route will be added automatically. You can verify this by using command Router#show ip router ospf on all routers.


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