Tag: routing
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Policy-Based Routing vs Route-Based: The Mistake That Broke Our Failover
Policy-based routing overrides the routing table — a PBR rule pointing to a dead link will blackhole traffic even if a route-table failover exists.
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OSPF Route Flapping: Why Your Core Network Keeps Reconverging
OSPF route flapping caused by interface instability triggers full SPF recalculation across all routers — a single unstable link can destabilize an entire OSPF domain.
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FortiGate BGP Route Redistribution Gone Wrong: How We Leaked Internal Routes to the Internet
Redistributing connected routes into BGP without a route-map filter will advertise every subnet on the FortiGate — including management and internal networks.