Redistributing Classful and Classless Networks into OSPF
By default, when redistribution into OSPF is configured, OSPF will only redistribute Classful networks. This default behavior can be changed by including the subnets keyword when redistributing routes into OSPF. As an example, assume that a router is receiving the following routes via EIGRP in autonomous system 1:
R2#show ip route eigrp
10.0.0.0/24 is subnetted, 5 subnets
D 10.0.1.0 [90/30720] via 10.0.0.1, 00:00:08, FastEthernet0/0
D 192.168.254.0/24 [90/156160 . . .
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