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TCP/IP Guide by Charles M. Kozierok

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OSPF Message Formats

As explained in the previous section, OSPF uses five different types of messages to communicate both link-state and general information between routers within an AS or area. To help illustrate how the OSPF messages are used, it's worth taking a look at the format of each of these messages.

OSPF Common Header Format

Naturally, each type of OSPF message includes a slightly different set of information; otherwise, there wouldn't be different message types. However, all message types share a similar message structure, beginning with a shared 24-byte header. This common header allows certain standard information to be conveyed in a consistent manner, such as the number of the version of OSPF that generated the message. It also allows ...

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