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352-001 · Question #383
352-001 Question #383: Real Exam Question with Answer & Explanation
The correct answer is A: IP Event Dampening. IP Event Dampening and Carrier Delay prevent link flapping from causing repeated routing reconvergence by suppressing or delaying the propagation of interface state changes.
Question
In an MPLS-based network, there is a link that constantly flaps. This flapping makes the network constantly reconverge and causes it to become unstable. Which two technologies can be deployed to resolve the design failure? (Choose two.)
Options
- AIP Event Dampening
- BBFD
- CCarrier Delay
- DIP Routing Protocol Route Purge
Explanation
IP Event Dampening and Carrier Delay prevent link flapping from causing repeated routing reconvergence by suppressing or delaying the propagation of interface state changes.
Common mistakes.
- B. BFD accelerates failure detection by sending rapid hello packets, which causes faster reconvergence on link failures - the opposite of what is needed when the goal is to suppress the effect of flapping.
- D. IP Routing Protocol Route Purge removes stale route entries from the routing table after a hold-down timer expires but does nothing to dampen or delay the reporting of interface state changes that trigger reconvergence.
Concept tested. Link flap stabilization with IP Event Dampening and Carrier Delay
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