Question 370
A service PE carries enterprise voice and bulk backups on the same uplink. Observed: Voice jitter rises during backup bursts although interface errors are zero. What evidence would validate recovery from this precise failure mode?
Explanation
Correct Answer
The intended result is Voice delay and jitter stay within the service objective during measured backup load. It specifically verifies recovery from the default forwarding class treats latency-sensitive voice like best-effort traffic, which produced the original symptom: Voice jitter rises during backup bursts although interface errors are zero. It is stronger evidence than a generic interface-up indicator.
Incorrect Answers
That observation would verify a separate fault involving a dscp classifier is not bound to the ingress traffic interface. Its symptom is Traffic with a valid voice DSCP enters the default best-effort queue. For this case the actual issue is the default forwarding class treats latency-sensitive voice like best-effort traffic, and the relevant success signal is Voice delay and jitter stay within the service objective during measured backup load.
This result is useful in another case with evidence The core no longer preserves premium treatment across label-switched paths. It does not test recovery from voice jitter rises during backup bursts although interface errors are zero. Check instead whether voice delay and jitter stay within the service objective during measured backup load.
It confirms an unrelated service correction: The firewall filter class action is attached on one ingress path but not the other. The present case reports Voice jitter rises during backup bursts although interface errors are zero. Its completion test is Voice delay and jitter stay within the service objective during measured backup load.