xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch User Manual
Database Description Packet
Version No.
2
Packet Length
Router ID
Area ID
Authentication Type
Authentication
Authentication
Checksum
Options
DD Sequence No.
Reserved
Reserved
Link-State Advertisement Header ...
I M MS
Figure 6- 123. Database Description Packet
Field
Description
Options
The optional capabilities supported by the router.
I - bit
The Initial bit. When set to 1, this packet is the first in the sequence
of Database Description packets.
M - bit
The More bit. When set to 1, this indicates that more Database
Description packets will follow.
MS - bit
The Master Slave bit. When set to 1, this indicates that the router is
the master during the Database Exchange process. A zero
indicates the opposite.
DD Sequence Number
User to sequence the collection of Database Description Packets.
The initial value (indicated by the Initial bit being set) should be
unique. The DD sequence number then increments until the
complete database description has been sent.
The rest of the packet consists of a list of the topological database’s pieces. Each link state advertisement in the database is
described by its link state advertisement header.
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