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Before you troubleshoot any OSPF neighbor-related issues on an NBMA network, it is important to remember that an NBMA network can be configured in these modes of operation with the ip ospf network command:

• Point-to-Point
• Point-to-Multipoint
• Broadcast
• NBMA

The Hello and Dead Intervals of each mode are described in this table:

Network Type	Hello Interval (secs)	Dead Interval (secs)
Point-to-Point	10	40
Point-to-Multipoint	30	120
Broadcast	10	40
Non-Broadcast	30	120

Reference