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Refer to the exhibit. The network administrator has configured the Customer Edge router (AS 64511) to send only summarized routes toward ISP-1 (AS 100) and ISP-2 (AS 200). router bgp 64511 network 172.16.20.0 mask 255.255.255.0 network 172.16.21.0 mask 255.255.255.0 network 172.16.22.0 mask 255.255.255.0 network 172.16.23.0 mask 255.255.255.0 aggregate-address 172.16.20.0 255.255.252.0 After this configuration. ISP-1 and ISP-2 continue to receive the specific routes and the summary route. Which configuration resolves the issue?
Correct Answer: A
When the aggregate-address command is used within BGP routing, the aggregated address is advertised, along with the more specific routes. The exception to this rule is through the use of the summary-only command. The "summary-only" keyword suppresses the more specific routes and announces only the summarized route.