Unlike EIGRP, which supports several different ways of generating and advertising the default route, OSPF uses only the default-information originate [always] [metric <value>] [metric-type <1|2>] [route-map <name>] router configuration command to advertise dynamically the default route.
The default-information originate command used by itself will configure the router to advertise a default route only if a default route is already present in the routing table. However, the [always] keyword can be appended to this command to force the router to generate a default route, even when one does not exist . . .
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