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300-410 Practice Question: Is troubleshooting a BGP route summarization issue
A network engineer is troubleshooting a BGP route summarization issue. Router R1 is configured with the 'aggregate-address 192.168.0.0 255.255.252.0' command without any keywords. The engineer notices that the ISP neighbor is receiving both the aggregate route and the more specific routes (192.168.0.0/24, 192.168.1.0/24, etc.), causing the ISP to prefer the specific routes. What should the engineer do to ensure the aggregate route is preferred?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the 'summary-only' keyword to the aggregate-address command.
By default, BGP prefers more specific routes over less specific ones. To make the aggregate route preferred, the engineer can use the 'summary-only' keyword to suppress specific routes, or use attributes like AS_PATH to make the aggregate more attractive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add the 'summary-only' keyword to the aggregate-address command.
Why this is correct
Correct. The summary-only keyword suppresses the advertisement of more specific routes, leaving only the aggregate route.
- ✗
Remove the network statements for the specific subnets from the BGP process.
Why it's wrong here
Incorrect. Removing network statements may cause the specific routes to not be injected, but the aggregate may still not be preferred if the specific routes are learned via other means.
- ✗
Configure a route-map to set a higher local preference on the aggregate route.
Why it's wrong here
Incorrect. Local preference is used for outbound traffic; it does not affect what the ISP prefers.
- ✗
Use the 'aggregate-address' command with the 'as-set' keyword.
Why it's wrong here
Incorrect. The as-set keyword preserves AS_PATH information but does not suppress specific routes.
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Written by Johnson Ajibi, MSc IT Security
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