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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.
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