1. A system for selecting open shortest path first (OSPF) aggregates, comprising: a database for containing data pertaining to candidate OSPF aggregates and corresponding weights; and an aggregate selector, associated with said database, that selects at least a subset of said OSPF aggregates such that said shortest path length between said particular source and destination subnets resulting from advertisement of a set of weighted aggregates approaches said shortest path length between said particular source and destination subnets irrespective of said advertisement.