Question 350
An external peer sends an entire Internet table to a small service PE. Observed: An unexpected memory spike occurs although only a few prefixes should be accepted. After the correction, which result would most convincingly show that this fault is resolved?
Explanation
Correct Answer
After apply a narrow import filter and prefix-limit according to the service agreement, inspect whether rIB contains only contracted routes and resource usage returns to safe levels. This closes the loop between the reported observation (An unexpected memory spike occurs although only a few prefixes should be accepted) and the underlying issue (BGP inbound acceptance policy and max-prefix safety do not constrain the contracted feed).
Incorrect Answers
It confirms an unrelated service correction: Upstream local preference overrides the longer AS-path signal. The present case reports An unexpected memory spike occurs although only a few prefixes should be accepted. Its completion test is RIB contains only contracted routes and resource usage returns to safe levels.
This result is useful in another case with evidence Path oscillation appears between two route reflectors after clients are rearranged. It does not test recovery from an unexpected memory spike occurs although only a few prefixes should be accepted. Check instead whether rIB contains only contracted routes and resource usage returns to safe levels.
That observation would verify a separate fault involving flowspec address-family negotiation or validation against unicast reachability fails. Its symptom is A FlowSpec announcement is present but the PE never applies the firewall action. For this case the actual issue is bgp inbound acceptance policy and max-prefix safety do not constrain the contracted feed, and the relevant success signal is RIB contains only contracted routes and resource usage returns to safe levels.