Question 290
A provider uses route damping on a customer aggregate. Observed: A stable recovered prefix stays suppressed after several route updates. After the correction, which result would most convincingly show that this fault is resolved?
Explanation
Correct Answer
After examine damping state and adjust the policy to approved convergence objectives, inspect whether the recovered prefix becomes usable after permitted penalty decay without excessive flapping. This closes the loop between the reported observation (A stable recovered prefix stays suppressed after several route updates) and the underlying issue (Route flap damping penalty and reuse thresholds remain active).
Incorrect Answers
This result is useful in another case with evidence A FlowSpec announcement is present but the PE never applies the firewall action. It does not test recovery from a stable recovered prefix stays suppressed after several route updates. Check instead whether the recovered prefix becomes usable after permitted penalty decay without excessive flapping.
It confirms an unrelated service correction: The policy term matches community yet assigns an unintended routing-instance action. The present case reports A stable recovered prefix stays suppressed after several route updates. Its completion test is The recovered prefix becomes usable after permitted penalty decay without excessive flapping.
That observation would verify a separate fault involving local preference policy unintentionally favors the expensive upstream path. Its symptom is Traffic selects an unwanted exit despite the closer contracted carrier. For this case the actual issue is route flap damping penalty and reuse thresholds remain active, and the relevant success signal is The recovered prefix becomes usable after permitted penalty decay without excessive flapping.