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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
146 Switch Management and Operating Concepts
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. One of the
routers is designated to be master, the other a slave. The
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 Packet
Version No.
2 P
Router ID
Area ID
Au
Authentication
Authentication
Checksum
DD Sequence No.
Reserved
Reserved
Link-State Advertisement Heade
IM
MS
acket Length
thentication Type
Options
r ...
Figure 5-24. Database Description Packet
Field Description
Options The optional capabilities
supported by the router.