The network command can be used to generate BGP routes for known network addresses in the routing table.
This section describes the generation of BGP aggregate route by the network command.

The unsuppress-map allows you to determine which pre-aggregation routes to advertise along with the aggregation routes for each neighbor.

This section describes the suppress-map option of the aggregate-address command for selective aggregation. suppress-map option allows you to determine the pre-aggregation routes that are not advertised.

When BGP aggregates routes, not only the aggregated route is advertised, but also the individual routes before the aggregation. Selective Aggregation allows control over which pre-aggregation routes are advertised along with the aggregate route.

This section describes advertise-map, an option of the aggregate-address command that generates BGP aggregate routes.

The as-set is an option for “what to do with the attributes of the aggregate route”. The as-set option allows the aggregate route to inherit attributes of the pre-aggregate routes.

The attribute-map is an option for “what to do with the attributes of the aggregate route”. The attribute-map allows attributes to be added to the aggregate route.