Open Shortest Path First (OSPF)
Published in: Protocols
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OSPF (Open Shortest Path First) is a link state Interior Gateway Routing protocol (IGRP). It uses cost as its routing metric.
Some of the features of OSPF are:-
- Support for MD5 based authentication
- Support for VLSM - Variable Length Subnet Mask (classless routing)
- Tagging of routes
OSPF based network can contain multiple smaller networks. OSPF uses both unicast and multicast for link state updates. Multicast address of 224.0.0.5 and 224.0.0.6 are used to send updates to other routers.