Cisco FPR4120-NGFW-K9 Firepower 4120 Next-Gen Firewall

A legacy NGFW appliance with a closed support lifecycle

FPR4120-NGFW-K 9 identifies the Cisco Firepower 4120 NGFW appliance, a 1 RU chassis with two network-module bays. Cisco ended sales on August 31, 2020, and its last support and signature-release dates were August 31, 2025. Those milestones have passed. Treat this exact order as legacy hardware when evaluating a spare or migration plan.

Fixed ports and optional expansion are different inventories

The 4120 has eight fixed 1/10-Gbps SFP+ data interfaces and 128 GB of DDR 4 memory. Two separate network-module slots can add supported interface types. The published maximum of 24 interfaces assumes two eight-port modules; it is not a count of ports guaranteed by the base order. Match each existing fiber link to a supported transceiver and the actual installed module.

Management is a separate SFP connection

The management interface requires a 1-Gbps fiber or copper SFP. Its transceiver requirement differs from treating management as a built-in copper RJ-45 data port. Record the management medium, module PIDs and optics independently when reproducing an existing configuration.

Plan the remaining role of a spare

A spare chassis does not extend the manufacturer support deadline or establish current security subscriptions. Before using this legacy order, verify the actual software and configuration, the supplied power and fan components, and the approved migration schedule. Keep any seller-provided warranty separate from Cisco lifecycle coverage.

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