EIGRP Default Route Issue

[Chris]

http://www.netbraintech.com/share/eigrp_default_route.gif
can we send a default information into eigrp by using directly the command.

ip summary-address eigrp 710 0.0.0.0 0.0.0.0

and why would we use the Leak-map in the first place ?

[David.C]

You can use the summary-address to advertise a default route. But please note that all routes from R3 will be replaced by the default route, since all routes are summarized as the default route.
Configuring the leak-map keyword allows you to advertise a component route that would otherwise be suppressed by the manual summary. Any component subset of the summary can be leaked. A route map and access list must be defined to source the leaked route.