Packet types for OSPF Hello packet:   Exchanges information about neighbors with each other. Database Description packet:   Elects a version of the database to be used.   Link-state request packet:   Requests a specific LSA from a neighbor.   Link-state update packet:   Sends an entire LSA to a neighbor who has requested an update.   Link-state acknowledge packet:   Acknowledges the receipt of a link-state update packet. 1.ospf_hello 2.ospf_dd 3.ospf_lsr                                                    3a.router LSA                                                                               ...