I wanted to configure a route to go over specific link in a case with multi-path, and found below info from Cisco Doc, and worked like a charm.  At one site, we have Nexus 7k, the router map had to be build with prefix rather than access-list.

So, the example is 

ip prefix-list LEAK-MAP seq 10 permit 10.1.1.0/24

route-map LEAK-10-1-1 permit 10

match ip address prefix-list LEAK-MAP

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---Cisco IP Routing Protocol Commands: -

EIGRP Support For Leaking Routes

Configuring the leak-map keyword allows 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.

The following is default behavior if an incomplete configuration is entered:

•If the leak-map keyword is configured to reference a nonexistent route map, the configuration of this keyword has no effect. The summary address is advertised but all component routes are suppressed.

•If the leak-map keyword is configured but the access-list does not exist or the route map does not reference the access list, the summary address and all component routes are sent.

Examples

The following example, starting in Global configuration mode, configures an administrative distance of 95 on interface Ethernet 0/0 for the 192.168.0.0/16 summary address:

Router(config)# router eigrp 1 

Router(config-router)# exit 

Router(config)# interface Ethernet 0/0 

Router(config-if)# ip summary-address eigrp 1 192.168.0.0 0.0.255.255 95 

The following example, starting in Global configuration mode, configures the 10.1.1.0/24 subnet to be leaked through the 10.0.0.0 summary address:

Router(config)# router eigrp 1 

Router(config-router)# exit 

Router(config)# access-list 1 permit 10.1.1.0 0.0.0.255 

Router(config)# ! 

Router(config)# route-map LEAK-10-1-1 permit 10 

Router(config-route-map)# match ip address 1 

Router(config-route-map)# exit 

Router(config)# interface Serial 0/0 

Router(config-if)# ip summary-address eigrp 1 10.0.0.0 0.0.0.255 leak-map LEAK-10-1-1 

Router(config-if)# end