IEEE OSPF Passive Interface, Designated Router And Backup Designated Router

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Designated router and backup designated router. Based on the network type, OSPF router can elect one router to be a designated router (DR) and one router to be a backup designated router (BDR). For example, on multiaccess broadcast networks (such as LANs) routers defaults to elect a DR and BDR.
Passive interfaces accept routing updates, but do not send them. Regarding OSPF, even though OSPF does not sent "routing updates" in the form that RIP, IGRP, and EIGRP do, you can still configure an OSPF-enabled interface as passive in order to prevent OSPF traffic from exiting that interface.

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