OSPFv2 Summary

OSPFv2 is used in large enterprise IPv4 networks. The network topology must be hierarchical. OSPF is used in the enterprise campus building access, distribution, and core layers. OSPF is also used in the enterprise data center, WAN/MAN, and branch offices.

The characteristics of OSPFv2 follow:

■ Link-state routing protocol.

■ Classless protocol (supports VLSMs and CIDR).

■ Metric is cost (based on interface bandwidth by default).

■ Fast convergence. Uses link-state updates and SPF calculation.

■ Reduced bandwidth use. Sends partial route updates only when changes occur.

■ Routes are labeled as intra-area, interarea, external Type 1, or external Type 2.

■ Support for authentication.

■ Uses the Dijkstra algorithm to calculate the SPF tree.

■ Default administrative distance is 110.

■ Uses multicast address 224.0.0.5 (ALLSPFRouters).

■ Uses multicast address 224.0.0.6 (ALLDRouters).

■ Very good scalability. Recommended for large networks.

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