D-Link DES-3326SR User Manual page 134

DES-3326SR Layer 3 Fast Ethernet Switch User's Guide
The Database Description Packet
Database Description packets are OSPF packet type 2. These
packets are exchanged when an adjacency is being initialized.
They describe the contents of the topological database.
Multiple packets may be used to describe the database. For
this purpose a poll-response procedure is used.
routers is designated to be master, the other a slave.
master seconds Database Description packets (polls) which are
acknowledged by Database Description packets sent by the
slave (responses). The responses are linked to the polls via the
packets' DD sequence numbers.
Database Description Packe
2
Version No.
Checksum
Reserved I M MS
Reserved
Link-State Advertisement He
Figure 5-24. Database Description Packet
Field
t
Packet Length
Router ID
Area ID
Authentication Type
Authentication
Authentication
Options
DD Sequence No.
ader ...
Description
122
One of the
The