187
Figure 10-39 OSPF Header
1) Version: The version number of OSPF run by this device. For instance, the OSPF run by our
IPv4 devices is of Version 2, and that run by IPv6 devices is of Version 3.
2) Type: The type of this packet. There are totally five types of OSPF packets, as shown in the
table below.
Type Code Packet Name
1 Hello Packet
2 Database Description Packet
3 Link State Request Packet
4 Link State Update Packet
5 Link State Acknowledgement Packet
Table 10-3 OSPF Packet Type
3) Router ID: ID of the router sending this packet.
4) Area ID
ID of the area that the router interface sending this packet belongs to.
5) Authentication Type: The authentication type applied by this packet. The segment marked
with * in the rear is regarded as essential information of authentication, as shown in the table
below.
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