Aggregate routes are used for advertising summarized network prefixes. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route. Whereas a generate route: This type of route generates a route that is always present in the routing table and can be used to summarize routes. However, it does not have the capability to only advertise the route when specific BGP routes are being received from a neighbor.

Both aggregate and generated routes would work, but the best choice is generated routes. One key difference... With aggregated routes any prefix in the routing table counts as a contributing route. With generated routes only prefix with a valid next-hop qualifies.