Prevent routes from showing in the routing table

How to prevent others from seeing some networks

This done by doing an outbound distribution list, This will also work for OSPF. It will prevent the OSPF routes from showing in the routing table, but the LSA will still exist.

 router eigrp 2001
   network 172.16.0.0
   distribute-list acl-no-16-3 out Serial0.1
   distribute-list acl-no-16-3 out Serial0.2
 !
 ip access-list standard acl-no-16-3
   deny 172.16.3.0 0.0.0.255
   permit any