3.5.e Implement and troubleshoot EIGRP stub

3.5.e [ii] Leak-map

To configure a summary aggregate address for a specified interface, use the ip summary-address eigrp command in interface configuration mode. To disable a configuration, use the no form of this command.

ip summary -address eigrp as-number ip-address mask [admin-distance] [leak-map name]

It allows propagation of a specific set of routes out of the summary in addition to the summary prefix itself. Manual summary route metric is derived from the best composite metric out of the routes that make up the summary.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 3199-3204).  . Kindle Edition.

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE-48D8-8048-C971179E4E24