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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 141
The OSPF Packet Header
Every OSPF packet is preceded by a common 24 byte header.
This header contains the information necessary for a receiving
router to determine if the packet should be accepted for further
processing.
The format of the OSPP packet header is shown below:
OSPF Packet Header
Type
Router ID
Area ID
Checksum
Au
Authentication
Authentication
Version No.
Packet Length
thentication Type
Figure 5-22. OSPF Packet Header
Field Description
Version No. The OSPF version
number
Type
T
he OSPF packet type.
The OSPF packet types
are as follows:
Type Description
1 Hello
2 Database