3.3.h Implement optimize and troubleshoot redistribution between any routing protocol

qoute from Wendell

bgp redistribution…

BGP does not use the concept of calculating a metric for each alternate route to reach a particular prefix. Instead, BGP uses a step-wise decision process that examines various PAs to determine the best route. As a result, redistribution into BGP does not require any consideration of setting metrics. However, a router might need to apply a route map to the redistribution function to manipulate PAs, which in turn affects the BGP decision process. If a metric is assigned to a route injected into BGP, BGP assigns that metric value to the BGP Multi-Exit Discriminator (MED) PA, which is commonly referred to as metric.