With redistribution it is necessary to take care of metrics from different routing protocols.
RIP uses Hop count
EIGRP uses a composition of bandwidth and delay
OSPF uses bandwidth
BGP consists of an arbitrary unit number
It is important to know how to adjust the metrics for redistributed routing protocols. Because they are not compatible by default, it necessary to convert them between the protocols.
OSPF has two differnet external metric types. Type 1 adds the metric defined in the OSPF domain to the metric of the boarder router. Type 2 ignore internal metric in the OSPF domain.