When the local routes need to be advertised to the peer, you can implement this configuration to add the specified network segment to the BGP4+ routing table. This configuration is available only when the routes are in the local routing table.
By configuring route aggregation, you can reduce the size of the routing table of a peer. BGP4+ supports automatic aggregation and manual aggregation. Procedure
A router sends a default route with the local address being the next hop to the specified peer, regardless of whether there are default routes in the local routing table.