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).
After this configuration, ISP-1 and ISP-2 continue to receive the specific routes and the summary route.
Which configuration resolves the issue?
A.
B.
C.
D.
To resolve the issue of ISPs still receiving specific routes along with summary routes, the aggregate-address command must include the 'summary-only' option. This ensures that only the summarized route is advertised, preventing the advertisement of individual specific routes. The configuration should be as follows: 'router bgp 64511 aggregate-address 172.16.20.0 255.255.252.0 summary-only'. Therefore, option A is correct because it uses 'aggregate-address' with 'summary-only' to ensure only summarized routes are sent.
A is the correct answer but let me clarify this: aggregate address is similar to route summary addresses like a router prefers to receive a single route instead of too many. notice here 172.16.20.0 255.255.252.0 covers from 172.16.21.0 to 172.16.23.0 so aggregate-add 172.16.20.0 255.255.252.0 summary only will force these addresses to send only summary to AS 100 and 200 to fulfill the request
The aggregate-address command causes a router to send a summary route AND still also send the normal individual routes - unless you add "summary-only." So A is correct.
Correct A
A is correct
Set this up to verify. Answer 'A' does indeed summarize on ISP-1 and 2.
The given answer is correct
A is correct