D-Link DGS-3312SR [152/290] Database description packet

D-Link DGS-3312SR [152/290] Database description packet
DGS-3312SR Stackable Gigabit Layer 3 Switch
Field Description
Network Mask
The network mask associated with this interface.
Options
Hello Interval
’s Hello packets.
Router Priority is used in the
this field is set to 0, the router is
BDR.
Router Dead Interval
The number of seconds that must pass before declaring a silent
Designated Router
terface
Designated Router
e Backup Designated Router (BDR) for this
R is identified here by its IP interface address on
.0.0.0 if there is no BDR.
Field
Neighbor
om whom valid Hello packets
er Dead Interval on the network.
The optional capabilities supported by the router.
The number of seconds between this router
Router Priority
This router’s Router Priority. The
election of the DR and BDR. If
ineligible become the DR or the
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 in
address on the network.
Backup
The identity of th
network. The BD
the network. This field is set to 0
Description
The Router Ids of each router fr
have been seen within the Rout
Database Description Packet
Database Description packets are OSPF pa alized.
They describe the contents of the topolog . For this
purpose a poll-response procedure is used 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 th
cket type 2. These packets are exchanged when an adjacency is being initi
ical database. Multiple packets may be used to describe the database
. One of the routers is designated
e polls via the packets’ DD sequence numbers.
Database Description Packet
Version No.
Packet Length
Router ID
Authentication
Che
Link-State Advertisement Header ...
2
Area ID
Authentication Type
cksum
Authentication
Options
DD Sequence No.
Reserved
Reserved
IM
MS
Figure 5- 21. Database Description Packet
139

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