address— Aggregate IP address.
mask— Aggregate mask.
Purpose: To create an aggregate entry in the BGP table. An aggregate is created only if a more-specific route of the aggregate exists in the BGP table. This form of the aggregate-address command advertises the aggregate while suppressing all the more-specific routes.
Cisco IOS Software Release: 10.0
In Figure 1-7, Router B is generating an aggregate for 172.16.0.0/22 while suppressing the specific routes that comprise the aggregate.
Router A router bgp 1 neighbor 10.1.1.2 remote-as ...