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Cisco® BGP-4 Command and Configuration Handbook (CCIE Professional Development) by William R. Parkhurst Ph.D.

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1-2. aggregate-address address mask as-set

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. Without the as-set option, the AS path information for the specific routes forming the aggregate is lost. This form of the aggregate-address command advertises the aggregate while retaining the AS path information for the more-specific routes.

Cisco IOS Software Release: 10.0

Configuration Example: Forming an Aggregate Consisting of Prefixes from Different Autonomous Systems

In Figure 1-4, Router A is learning about networks 172.16.0.0/24 and 172.16.1.0/24 from AS 65530 and networks ...

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