Open Shortest Path First (OSPF) runs over the Internet Protocol’s network layer. So, Open Shortest Path First (OSPF) encapsulated only by IP and local data-link headers. Encapsulating OSPF messages transmitting over an Ethernet link contain the following information:
Data Link Frame Header– This header contains the destination multicast MAC addresses.
IP Packet Header–This header contains the IPv4 protocol field 89 indicates an OSPF packet. It also identifies one of two OSPF multicast addresses, 224.0.0.5 or 224.0.0.6.
OSPF Packet Header–This header shows the OSPF packet type and also show the router ID and the area ID.
OSPF Packet Type Specific Data– This header contains the OSPF packet type information
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