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Routing & Switching · Advanced

Filter-Based Forwarding (FBF)

Junos policy routing that uses a firewall filter to direct matching traffic to a specific routing instance.

Definition

A firewall filter on the ingress interface matches traffic and uses the routing-instance action to send it to a forwarding-type instance with its own routes. A rib-group usually shares interface routes into that instance so next hops resolve.

Example

then routing-instance ISP2 in a firewall filter term

Exam tip

FBF requires a forwarding instance plus an interface rib-group; missing the rib-group is a classic mistake.

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