Cisco® BGP-4 Command and Configuration Handbook (CCIE Professional Development)

1-6. aggregate-address address mask summary-only

Syntax Description:

• 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

Configuration Example: Advertise an Aggregate While Suppressing the More-Specific Routes

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.

Figure 1-7. Suppressing the Specific Routes of the Aggregate

Router A
router bgp 1
neighbor 10.1.1.2 remote-as ...