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Routing & Switching · Intermediate

BGP Aggregate Address

A BGP command that creates a summary route when at least one component exists in the BGP table.

Definition

aggregate-address advertises the summary alongside components unless summary-only is used. as-set preserves AS path information from components to prevent loops; otherwise ATOMIC_AGGREGATE and AGGREGATOR attributes are set. suppress-map and unsuppress-map give finer control.

Example

aggregate-address 172.16.0.0 255.255.0.0 summary-only

Exam tip

Without summary-only, both aggregate and specific routes are advertised.

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