8.6 BGP Attributes
8.6.9
The Aggregator attribute
Aggregator is a well-known discretionary attribute (type code 7). When configuring address aggregation, you can also configure the router to include its router ID and local AS number along with the supernet route. This attribute enables ISP administrators to determine which BGP router is responsible for a particular instance of aggregation. Tracing a supernet to its original "aggregator" may be necessary for troubleshooting purposes.