HP VSR1000 Configuration Guide

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Figure 26 Hello packet format
Major fields of the hello packet are as follows:
• Network mask—Network mask associated with the router’s sending interface. If two routers have
different network masks, they cannot become neighbors.
• HelloInterval—Interval for sending hello packets. If two routers have different intervals, they cannot
become neighbors.
• Rtr Pri—Router priority. A value of 0 means the router cannot become the DR or BDR.
• RouterDeadInterval—Time before declaring a silent router down. If two routers have different dead
intervals, they cannot become neighbors.
• Designated router—IP address of the DR.
• Backup designated router—IP address of the BDR.
• Neighbor—Router ID of the neighbor router.
DD packet
Two routers exchange database description (DD) packets, describing their LSDBs for database
synchronization. A DD packet contains only the headers of LSAs to reduce traffic.
...
Network mask
HelloInterval Options Rtr Pri
RouterDeadInterval
Designated router
Backup designated router
Neighbor
Version 1
Router ID
Area ID
Checksum AuType
Packet length
Authentication
Authentication
0715 31
Neighbor

HP VSR1000 Specifications

General

Brand	HP
Model	VSR1000
Category	Network Router
Language	English