Routing tables of OSPF

OSPF maintains these routing tables:
 ✦ Neighbor table: This table keeps track of the neighbors of a router.
Each router running OSPF maintains its own neighbor table. Thus, each
router has a clear picture of its peer routers, and each router has a
clear picture of the network topology in its immediate vicinity.
 ✦ Link-state table: This table keeps track of the state of the links on neigh-bor routers. In other words, this table keeps track of the state of the
routes on neighbor routers. Each router running OSPF maintains its own
link-state table. Thus:
  •  Each router has a clear picture of the topology in the immediate
vicinity of its neighbors.
  •  Using the neighbor table and the link state, each router has a two-level knowledge of the network topology: the topology in its immedi-ate vicinity and the topology in the vicinity of its neighbors.
 ✦ Routing table: This table keeps track of the metrics of each link tracked
by the link-state table. Hence, whereas the neighbor and link-state
tables are used to quantify routes, the routing table is used to qualify
each route.