ROLE OF THE ROUTER IN OSPF
OSPF permits a router to assume several different roles in an OSPF routing domain. It can act as a designated router for an autonomous system, a designated router for an area within an autonomous system, and a designated router for a network to which multiple routers are attached. Within these routing domains, the router may send and receive several different types of LSAs. Some LSAs are for handshakes between the routers, such as a hello packet; others contain information about a node's database; still others are update packets. The approach taken in this chapter is to focus on the key routing update packets.
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