HP 3600 v2 series Configuration Manual page 76

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
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different network masks, they cannot become neighbors.
HelloInterval: Interval for sending hello packets. If two routers have different intervals, they cannot
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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
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intervals, they cannot become neighbors.
• Designated router: IP address of the DR.
Backup designated router: IP address of the BDR.
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Neighbor: Router ID of the neighbor router.
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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.
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