Question 1
AdvancedFortiSwitch Concepts · Configure the ports required for stack deployment
A network architect is designing a high-availability campus network using FortiSwitch devices managed by a FortiGate. The design requires an MCLAG (Multi-Chassis Link Aggregation Group) pair at the distribution layer. During the configuration planning, the architect must ensure loop prevention and proper traffic handling if the Inter-Chassis Link (ICL) fails but the peer keepalive link remains active.
Based on standard FortiSwitch MCLAG behavior, which action does the secondary MCLAG peer take in this split-brain scenario?
Answer and explanation
Correct answer: B
In an MCLAG split-brain scenario where the ICL fails but the keepalive link is up, the secondary switch detects that the primary is still alive via the keepalive. To prevent Layer 2 loops and inconsistent forwarding, the secondary switch shuts down its MCLAG member ports (and typically other non-management ports, depending on configuration).
