OSPF uses the path cost metric to determine the best route to a destination network. The path cost is based on the bandwidth of the link. Lower path costs indicate faster or more desirable paths.
The "ip ospf cost" command can be used to manually set the cost of an OSPF-enabled interface. The "bandwidth" command can indirectly affect OSPF metric calculation by adjusting the bandwidth on an interface, which in turn affects the OSPF metric calculation.
an interface
OSPF is a link-state routing protocol.
There are actually two OSPF and IS-IS
Full
OSPF stands for open shortest path first. OSPF is an exterior routing protocol. OSPF uses Path vector routing algorithm.
OSPF is a link-state routing protocol that helps Routers exchange IP routes. OSPF Adjacencies is the established "neighborship" between two OSPF routers in order to make the exchange of routes. In this case, Adjacency means the same as "peering", that the OSPF speakers (routers) are able to "talk" to each other.
link state advertisement
OSPF is a classless link-state routing protocol. RIP version 1 and IGRP are both classful distance vector routing protocols, EIGRP is a hybrid protocol that supports classless addressing.
the extensive flooding of LSAs throughout the OSPF areathe excessive adjacencies when the number of routers increases
OSPF