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OSPF Terminology

Neighbor – A neighbor refers to a connected (adjacent) router that is running an OSPF process with the adjacent interface assigned to the same area. Neighbors are found by Hello packets.
Adjacency - An adjacency refers to the logical connection between a router and its corresponding designated routers and backup designed routers.
Link – In OSPF, a link refers to a network of a router interface assigned to any given network. Within OSPF, link is synonymous with interface.
Interface – An interface is a physical interface on a router. When an interface is added to the OSPF process, it is considered by OSPF as a link. If an interface is up than a link is up.
Link State Advisement – (LSA) is an OSPF data packet containing link state and routing information that is shared among OSPF routers.
Designated router – (DR) is only used when the OSPF router is connected to a broadcast (multi-access) network.
Backup Designated router – (BDR) is a hot standby for the DR on broadcast links.
OSPF areas – OSPF areas are similar to EIGRP Autonomous Systems. Areas are used to establish a hierarchical network. It uses four types of areas.
Area boarder router – (ABR) is a router that has

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