D-Link DXS-3326GSR Manual page 155

Router Dead Interval
Designated Router
Backup Designated Router
Field
Neighbor
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) that are acknowledged by Database Description packets sent by the slave
(responses). The responses are linked to the polls via the packets' DD sequence numbers.
Version No.
Reserved
Field
Options
I - bit
M - bit
MS - bit
DXS-3326GSR Gigabit Layer 3 Switch
The number of seconds that must pass before declaring a
silent router as down.
The identity of the DR for this network, in the view of the
advertising router. The DR is identified here by its IP interface
address on the network.
The identity of the Backup Designated Router (BDR) for this
network. The BDR is identified here by its IP interface address
on the network. This field is set to 0.0.0.0 if there is no BDR.
Description
The Router IDs of each router from whom valid Hello packets
have been seen within the Router Dead Interval on the
network.
Database Description Packet
2
Router ID
Area ID
Checksum
Authentication
Authentication
I M MS
Reserved
DD Sequence No.
Link-State Advertisement Header ...
Figure 7- 20. Database Description Packet
Description
The optional capabilities supported by the router.
The Initial bit. When set to 1, this packet is the first in the sequence
of Database Description packets.
The More bit. When set to 1, this indicates that more Database
Description packets will follow.
The Master Slave bit. When set to 1, this indicates that the router is
the master during the Database Exchange process. A zero
Packet Length
Authentication Type
Options
142