NSE4 Question #256: Real Exam Question with Answer & Explanation

Question

In order to load-share traffic using multiple static routes, the routes must be configured with ...

Options

• Athe same distance and same priority.
• Bthe same distance and the same weight.
• Cthe same distance but each of them must be assigned a unique priority.
• Da distance equal to its desired weight for ECMP but all must have the same priority.

Explanation

To enable Equal-Cost Multi-Path (ECMP) load sharing for static routes on a FortiGate, all routes must be configured with the same administrative distance and priority.

Common mistakes.

• B. FortiGate static routes use 'priority' for tie-breaking when distances are equal, not 'weight' for unequal cost load balancing.
• C. Assigning a unique priority when distances are the same would cause the FortiGate to select only the route with the lowest priority, not to load-share.
• D. While ECMP involves equal costs, the concept of 'weight' for ECMP is not directly applied in FortiGate static routes; path preference is determined by distance and priority.

Concept tested. FortiGate ECMP static route configuration

Reference. https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/869581/equal-cost-multi-path-ecmp

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