Comprehensive and Detailed Explanation From Exact Extract documents and Knowledge:
OSPF external routes (Type 5 LSAs) can be learned from multiple paths. For a FortiGate to install multiple equal-cost paths into the routing table—a feature known as ECMP (Equal-Cost Multi-Path) —the OSPF process must have ECMP enabled and the maximum path count must be set to a value greater than one. If ECMP is disabled or the limit is set to 1, the FortiGate will select only the single best path (based on cost and RFC 1583/2328 selection rules) to install in the routing table, even if multiple valid advertisements exist.
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