What are the methods for breaking loops in Huawei's multi-MPP network? (Multiple choice)

Question

Options

• ASTP
• BMSTP
• CTTL
• DDuplicate frame sequence number detection

• A
  74% (20)
• C
  19% (5)
• D
  7% (2)

Explanation

In Huawei's multi-MPP networks, STP (A) and MSTP (B) are correct because both are IEEE-standardized Spanning Tree protocols specifically designed to detect and eliminate Layer 2 loops by logically blocking redundant paths - STP handles a single tree instance, while MSTP extends this with multiple instances for better VLAN-aware loop prevention.

TTL (C) is wrong because Time to Live operates at Layer 3 to limit a packet's lifespan; it mitigates the damage from loops (packets eventually die) but does not actively detect or break the loop topology itself.

Duplicate frame sequence number detection (D) is wrong because, while some protocols use sequence numbers to identify duplicates, this is a detection/filtering mechanism - it discards redundant frames after the fact rather than preventing the loop from forming in the first place.

Memory tip: Both correct answers share "ST" - think "Stop Topology loops." If a protocol name contains "Spanning Tree," it's a loop-breaker; TTL and sequence detection are loop-limiters, not breakers.

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