Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of BFD Optimization:
BFD (Bidirectional Forwarding Detection) is a protocol that provides rapid detection of link failures.
Optimizing BFD involves adjusting parameters to balance between detection speed and network stability.
2. Analysis of Each Statement:
Option A: After a high priority is configured for BFD packets, BFD packets are preferentially forwarded.
Correct (True Statement).
High priority ensures that BFD packets are not delayed or dropped under congestion, improving detection accuracy.
Option B: To quickly learn about the network status and performance requirements, you can set the interval for sending BFD packets to the minimum value.
Incorrect (False Statement).
Setting the interval to the minimum value can lead to excessive BFD session flapping, which may overload the network or cause instability. The interval should be configured based on network requirements and conditions, rather than set to the minimum.
Option C: On a live network, some devices switch traffic only when a BFD session changes to the Up state... configure a delay to compensate for the time difference.
Correct (True Statement).
This is a valid optimization to avoid issues caused by timing mismatches between BFD and routing protocols.
Option D: If a BFD session flaps, master/backup switchovers are frequently performed... set the WTR time.
Correct (True Statement).
The WTR (Wait to Restore) timer helps stabilize BFD by delaying session recovery after a flap, reducing the risk of frequent switchovers.
3. Summary:
The false statement isB, as setting the BFD packet interval to the minimum can destabilize the network.
[Reference:, Huawei HCIA-Datacom Study Guide, Chapter "BFD Configuration and Optimization.", , , ]
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