Selecting the Best Route

Cisco routers use the following two parameters to select the best path when they learn two or more routes to the same destination from different routing protocols:

■ Administrative distance: As described in the previous section, the administrative distance is used to rate a routing protocol's believability. This criterion is the first thing a router uses to determine which routing protocol to believe if more than one protocol provides route information for the same destination.

■ Routing metric: The routing metric is a value representing the path between the local router and the destination network, according to the routing protocol being used. This metric is used to determine the routing protocol's "best" path to the destination.

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