Which of the following statements are false about heartbeat link faults in an M-LAG? (Select All that Apply)

In Huawei’s M-LAG (Multi-Chassis Link Aggregation), the heartbeat link (or peer-link) ensures

communication between member devices. A fault in this link can impact M-LAG operation. Let’s

evaluate each statement:

A. The fault that two master devices exist cannot be detected in the case of a peer-link fault: This is

false. A peer-link fault can be detected, and mechanisms like dual-master detection (e.g., via Inter-

Chassis Communication Link or ICC) can identify if both devices assume master roles, triggering

corrective actions. FALSE.

B. An alarm is triggered: This is true. A peer-link fault generates an alarm to notify administrators, as

it’s a critical failure in M-LAG operation, per Huawei’s fault management system. TRUE.

C. The fault protection mechanism is triggered: This is true. Huawei M-LAG includes protection

mechanisms (e.g., failover to backup links or shutdown of conflicting interfaces) to mitigate peer-link

faults and maintain service continuity. TRUE.

D. Services are affected: This is false. With proper configuration (e.g., redundant links or fast

failover), services should not be affected by a peer-link fault, as M-LAG is designed for high

availability. Impact depends on redundancy, but the design goal is uninterrupted service. FALSE.

Thus, A and D are false statements because dual-master faults can be detected, and services are not

necessarily affected with adequate redundancy.

Reference: Huawei CloudEngine Series Switch Configuration Guide – M-LAG Fault Handling; HCIP-

Data Center Network Training – M-LAG Reliability.