D-Link DES-3326SR User Manual page 128

DES-3326SR Layer 3 Fast Ethernet Switch User's Guide
secondary.
secondary for information.
• Exchange − Routers will describe their entire
link-state
description packets.
•
Loading
information exchange.
request list and a link-state retransmission list.
Any information
outdated will be put on the request list.
update
retransmission list until it gets acknowledged.
• Full − The adjacency is now complete.
neighboring routers are fully adjacent. Adjacent
routers will have the same link-state database.
Adjacencies on Point-to-Point Interfaces
OSPF Routers that are linked using point-to-point interfaces
(such as serial links) will always form adjacencies.
concepts of DR and BDR are unnecessary.
OSPF Packet Formats
All OSPF packet types begin with a standard 24 byte header
and there are five packet types. The header is described first,
and each packet type is described in a subsequent section.
All OSPF packets (except for Hello packets) forward link-state
advertisements. Link-State Update packets, for example, flood
advertisements throughout the OSPF routing domain.
•
OSPF packet header
•
Hello packet
The primary router will poll the
database by sending
−
The routers are
Routers have link-state
that looks
that is sent will be
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database
finalizing the
incomplete or
Any
put on the
The
The