Redistribution: Metric and Metric Types to Influence Redistributed Routes

When a router in a single routing domain receives multiple routes for the same subnet it must pick the best path to the subnet.  Redistributed routes that are considered for best path can be injected into the routing table with specific metric values and types to influence routing.

The following table shows the routing preference for various protocols and what the router will decide is the best path based on the type of metric the route has:

orderofprecedencemetric.PNG

Keep in mind some routers might not use metric as the first consideration, for example OSPF will first take an intra-area route over an inter-area route, regardless of the metric.

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