Open Shortest Path First (OSPF, RFC 2178)

• Shortest-path routes based on true metrics, not just a hop count.

• Computes the routes only when triggered to or every 30 minutes (whichever is less).

• Pairs a network address entry with a subnet mask.

• Allows for routing across equal paths.

• Supports ToS.

• Permits the injection of external routes (other ASs).

• Authenticates route exchanges.

• Quick convergence.

• Direct support for multicast in both the IP header and the MAC header.

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