ATOMIC_AGGREGATE
The ATOMIC_AGGREGATE attribute is used when routes have been summarized. It indicates which AS and which router summarize the routes. It also tells downstream routers not to de-aggregate the route. Summarized routes are routes with similar information that have been combined, or aggregated, into one route that is easier to send in updates. When it reaches its destination, the summarized routes are split back up into the individual routes.
Your FortiGate unit doesn’t specifically set this attribute in the BGP router command, but it is used in the route map command.
The commands related to ATOMIC_AGGREGATE include:
config router route-map
edit <route_map_name>
config rule
edit <route_map_rule_id>
set set-aggregator-as <id_integer>
set set-aggregator-ip <address_ipv4>
set set-atomic-aggregate {enable | disable}
end
end
end