When default information is being passed along through a dynamic routing protocol, no further configuration is required. In the case of RIP, there can be only one default route, network 0.0.0.0. However, in the case of IGRP, several networks can offer default routes, although only one is used.
If the router is not directly connected to the default network but does have a route to it, it is considered as a candidate default path. When there are multiple default routes in the routing table, the route candidates are examined. As you would expect, the best default path is selected based on administrative distance and metric. The gateway to the best default path then becomes the gateway of last resort for the router. This is displayed in the gateway of last resort display in this command:
show IP route
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