ospf scenario

 ospf scenario

• Highest IP address ABR routes convert the type7 into type 5.
• Default route is not generated by default in area nssa unless "are nssa <> default originate " configured.
• Totally stubby NSSA area generate the default route by default.
• DR/BDR does not support the preempt therefore if DR fails BDR will become DR new BDR will be connected. DR does not become DR even when it is high priority.
• With "ip ospf priority 0" router does not participate in DR/BDR.
• OSPF behaves as distance vector protocol when multiple area in use.
• Highest priority/IP address becomes the DR/BDR. 
• OSPF hellos are always send from primary interface.