Full English Description for Cisco FPR4125-NGFW-K9

1. Official Short Order Description

Cisco FPR4125-NGFW-K9: High-performance modular 1RU rack-mount Next-Generation Firewall (NGFW) from discontinued Cisco Firepower 4100 series (EoS Jan 6, 2026, limited residual TAC support), factory preloaded Firewall Threat Defense (FTD v7.6+) as primary OS, permanent Security Plus K9 unrestricted base license. Fixed native port bank: 8×1/10G SFP+ multi-speed fiber ports, two independent interchangeable NM-2 modular expansion bays supporting 10G SFP28 / 40G QSFP28 / 100G QSFP28 breakout uplink modules, standalone 1G copper out-of-band management port, dual console interfaces (RJ45 serial + USB 2.0 Type-A), dual hot-swappable redundant 1100W AC power supplies standard, dual high-core Intel Xeon split security processors with dedicated QuickAssist hardware crypto accelerator, 256GB DDR4 ECC memory, dual hot-swappable U.2 NVMe SSD slots (1×900GB drive preinstalled, second slot supports SW RAID 1 for log/threat rule redundancy). Dual OS support: FTD default boot image, optional Cisco Secure Firewall ASA OS v9.xCisco.

Official certified performance metrics (1024B standard UDP test packets):

Raw stateful firewall throughput (FW only): 45.0 Gbps
Full threat-inspected NGFW throughput (FW+AVC+IPS): 45.0 Gbps
Standalone Snort 3 NGIPS inspection throughput: 45.0 Gbps
Hardware-accelerated IPsec VPN throughput: 19.0 Gbps (19.0 Gbps base, up to 26.0 Gbps with FTD 7.2 VPN offload enabled)
TLS/SSL hardware decryption throughput: 8.5 Gbps
Maximum concurrent TCP/UDP connections with AVC enabled: 25,000,000
Maximum new connections per second with AVC: 269,000
Total concurrent AnyConnect remote + site-to-site IPsec VPN peers: 20,000
Maximum logical routed VLAN interfaces: 1024
Maximum multi-context virtual firewalls under K9 license: 1000

Managed via local ASDM/FDM web GUI, Firepower Management Center (FMC), Cisco Security Manager (CSM), Cisco Defense Orchestrator (CDO), offline serial console and USB storage. Discontinued legacy high-performance large enterprise & nationwide carrier backbone modular rack security hardware, designed for hyperscale enterprise headquarters, nationwide carrier core DMVPN aggregation, multi-building large university core edge, hyperscale carrier MSP multi-tenant colocation and ultra-high-bandwidth hybrid cloud data center segmentation requiring dual redundant power, dual expandable 100G uplink module bays and massive multi-tenant virtualization capacity.

2. Complete Detailed Product Overview

Product Line Positioning

The Cisco FPR4125-NGFW-K9 is the high-performance modular rack appliance in the Firepower 4100 generation, positioned above mid-high tier FPR4120 and below flagship top-tier FPR4145 models. It shares the standard 19-inch 1RU rack form factor and identical base 8×1G/10G SFP+ fixed fiber ports plus two independent NM-2 expansion bays as all lower 4100 models, with unified hardware upgrades: dual hot-swappable redundant power supplies standard, high-core dual Intel Xeon split security processors, 256GB DDR4 ECC memory, industry-leading concurrent connection/VPN peer counts, expanded 1000 multi-context virtual firewall limits and high TLS decryption throughput for heavy encrypted traffic data center and carrier workloads.

The split dual-chip architecture segregates basic L3 forwarding and heavy security offload tasks (IPsec bulk encryption, massive TLS decryption, Snort 3 IPS, AVC deep application inspection) with dedicated hardware QAT crypto acceleration, eliminating throughput degradation when IPS, AVC, TLS decryption and AMP malware sandbox run simultaneously at full line rate. The chassis runs FXOS chassis manager to control all hardware resources, then instantiates either FTD unified NGFW or ASA classic firewall as a logical device (the two OSes cannot run concurrently without full chassis reimage).

The K9 suffix delivers permanent Security Plus unrestricted licensing, removing DES encryption limitations and unlocking full enterprise feature set including expanded 1000 multi-context virtualization, unlimited TLS proxy sessions, complete dual-mode high availability and 1024 VLAN capacity, vastly outperforming FPR4110/4112/4120 and discontinued Firepower 2100 legacy appliances. Cisco announced End-of-Sale for all Firepower 4100 hardware on Jan 6, 2026; the Secure Firewall 4200 series is the official replacement platformCisco.

Physical Hardware & 1RU Rack-Mount Architecture

Form Factor & Mechanical Specifications

Standard 19-inch EIA-310-D rack-mountable 1RU metal chassis with redundant 3+1 hot-swappable variable-speed front-to-back airflow cooling fans; single fan fault triggers remaining fans to ramp full speed without traffic outageCisco. Dimensions: 4.4cm (H) × 42.9cm (W) × 75.4cm (D), total weight 18.2kg (fully loaded with dual PSU, two NM modules and all fans).
Dual built-in hot-swappable universal 100–240V 50/60Hz 1100W AC power supplies standard for full 1+1 power redundancy; typical power draw 78W, max 98W under full throughput load. Optional 950W hot-swappable DC power supplies for telco rack environmentsCisco.
Operating temperature range: 0°C ~ +40°C below 10,000ft altitude; 0°C ~ +35°C from 10,000–13,000ft; short-term storage tolerance -40°C ~ +65°C; humidity 5–95% non-condensing, max operating altitude 3048m; full NEBS Level 3 certified.
Front panel multi-color LED indicators: Global power status, dual independent PSU health, system health, FTD logical device operational state, failover synchronization status, fan fault alarm, per-port link/activity LEDs for all native SFP+ and management interfaces.
Integrated Kensington security lock slot for physical anti-tampering protection against unauthorized chassis disassembly.
Hardware core: Dual split high-performance architecture (two high-core Intel Xeon x86 general forwarding CPUs + dedicated multi-core Cavium NPU with native QuickAssist crypto offload engine for wire-speed IPsec/TLS acceleration), 256GB soldered DDR4 ECC high-speed SDRAM, 16GB onboard eMMC boot flash, dual hot-swappable U.2 NVMe self-encrypting SSD drive bays (1×900GB factory preinstalled, second empty slot for optional SW RAID 1 redundancy for log and threat rule storage).
Rear peripheral interfaces: 1×USB 2.0 Type-A port for external flash backup, firmware upload and log offloading; RJ45 RS-232 serial console for offline device recovery without network connectivity.
Compliance certifications: FCC Class A, CE, FIPS 140-3 Level 1, EMC enterprise industrial standard, full NEBS Level 3 qualified.

Rear Panel Fixed Port Layout

Native Fixed Multi-Speed Fiber Port Group (8×1/10G SFP+)
- 8 × SFP+ fiber slots supporting both 1G and 10G SFP/SFP+ transceivers (SR/LR/SX) for long-distance inter-campus / inter-branch fiber backbone uplinks and high-speed 10G data center/cloud connections; no built-in copper RJ45 ports on base chassis.
Dual Independent NM-2 Modular Expansion Bays: Two front modular slots for optional interchangeable network modules to expand port density without chassis replacement (supports copper 1G, 10G SFP+, 40G QSFP28, 100G QSFP28 hardware bypass modules exclusive to FPR4125/FPR4145).
Management0/0: Fully isolated dedicated 1G out-of-band copper management port, separated entirely from production data plane traffic for secure FMC/ASDM/FDM/CDO administrative communication.
RJ45 serial console port, single USB 2.0 storage port, recessed hardware factory reset pushbutton.
Dual IEC AC power input sockets for two bundled power cords, dual redundant integrated hot-swappable power supplies.
DB-15 serial failover port for real-time session synchronization in Active/Standby or Active/Active HA firewall pair deployments.

Supported Optional NM-2 Expansion Modules

FPR4125-NGFW-K9 compatible interchangeable network modules for flexible capacity expansion:

FPR3K-XNM-8X10G: 8×1/10G SFP+ fiber hardware bypass module
FPR3K-XNM-4X40G: 4×40G QSFP28 fiber hardware bypass module (breakout to 4×10G per port)
FPR3K-XNM-2X100G: 2×40/100G QSFP28 fiber hardware bypass module (breakout to 4×10G / 4×25G per port)
FPR3K-XNM-8GE: 8×1G RJ45 copper hardware bypass module

All SFP/SFP+/SFP28/QSFP28 optical transceivers sold separately as compatible accessories. No internal threat expansion blades supported.

Core Performance & K9 Security Plus Full License Capabilities

Official Cisco Datasheet Performance Benchmarks (FTD OS)

Raw firewall throughput (FW only, 1024B UDP): 45.0 Gbps
Full threat-inspected NGFW throughput (FW+AVC+IPS): 45.0 Gbps
Standalone Snort 3 NGIPS inspection throughput: 45.0 Gbps
Hardware-accelerated 3DES/AES IPsec VPN throughput: 19.0 Gbps (19.0 Gbps base, up to 26.0 Gbps with FTD 7.2 VPN offload enabled)
TLS hardware decryption throughput: 8.5 Gbps
Maximum concurrent TCP/UDP connections with AVC application control: 25,000,000 (20,000 hard cap on K8 DES base license)
Maximum new connections per second with AVC: 269,000
Total concurrent VPN peers (IPsec site-to-site + AnyConnect SSL remote access): 20,000 total sessions
Maximum logical routed VLAN interfaces: 1024 independent security zones (50 VLAN hard limit on K8 base license)
Maximum multi-context virtual firewalls: 1000 independent contexts (0 contexts on K8 DES license)

Exclusive K9 Security Plus License Advantages vs FPR4125-NGFW-K8 DES Base SKU

Full enterprise-grade encryption suite: DES, 3DES-168, AES-128/AES-192/AES-256; K8 only supports weak DES encryption and fails PCI-DSS, HIPAA and enterprise regulatory compliance standards.
1024 logical routed VLAN interfaces vs hard limit of 50 VLANs on K8 base license.
Unlimited TLS proxy sessions for encrypted SIP/SCCP VoIP inspection; K8 capped at only 1,000 concurrent TLS proxy sessions.
Complete dual-mode high availability: Active/Standby and load-balanced Active/Active inter-chassis failover fully enabled; all HA functionality locked and unavailable on K8 base license.
Up to 1000 independent multi-context virtual firewalls for hyperscale carrier MSP multi-tenant colocation segmentation; virtual context feature entirely disabled on K8 DES license.
Native multi-device VPN clustering and load balancing fully enabled for centralized large-scale national DMVPN branch aggregation hubs (cluster up to 16 identical units, higher node limit than Secure Firewall 3100 series).
2 permanent base AnyConnect Premium SSL/DTLS remote user seats, expandable via separate AnyConnect Plus/Apex subscription licenses.
Unlimited internal enterprise branch host endpoints with no artificial session throttling or device count limits.

Full Integrated Security & Networking Feature Suite (FTD / Optional ASA OS)

1. Stateful Next-Generation Firewall with Snort 3 NGIPS

Wire-speed full stateful TCP/UDP connection tracking to block stateless bypass attacks, unified L3–L7 policy engine consolidating firewall, IPS, URL filtering and QoS rules within one management plane. Object-group ACL policy management for granular multi-segment traffic access control. Multi-layer enterprise DDoS protection toolkit: SYN flood suppression, port scan detection, full packet TCP normalization, malformed packet filtering, strict/loose URPF source IP anti-spoof filtering. Layer 7 application inspection ALGs for FTP, H.323, SIP, SCCP, RTSP, DNS, HTTP/S, SMB, RDP and mainstream SaaS protocols. Native Transparent Layer 2 firewall mode for inline campus/enterprise core network deployment without reworking existing internal IP addressing schemes. Embedded Snort 3 NGIPS powered by Cisco Talos global threat intelligence, AVC application visibility & control (6000+ recognized applications), URL category web filtering (280M+ global categorized URLs), AMP for Networks cloud malware sandboxing and cross-threat correlation; no external expansion blades required. Supports Cisco AI Assistant for automated policy optimization and misconfiguration detection.

2. Standards-Based Multi-Protocol VPN Suite

Site-to-site IKEv1/IKEv2 IPsec tunnels for secure inter-campus private fiber backbone connectivity over public broadband internet. Clientless SSL VPN + AnyConnect Premium SSL/DTLS remote access VPN for browser and full-client global remote worker connectivity. GRE tunnel encapsulation for routed non-IPsec traffic across distributed large-scale national DMVPN hub-spoke enterprise fabrics. Dedicated NPU hardware crypto acceleration eliminates CPU bottlenecks for up to 20,000 concurrent IPsec/AnyConnect tunnels. Supports NAT-T, IKE fragmentation, certificate-based IKE authentication via local CA or enterprise PKI infrastructure, plus multi-chassis VPN clustering for nationwide remote access aggregation hubs. Optimized for multi-region hub-and-spoke DMVPN architectures with hundreds of remote branch spokes connected via 10G/40G/100G fiber uplinks.

3. Enterprise & Broadband Routing & NAT Services

Static one-to-one NAT, dynamic NAT pools and PAT overload for shared public IP addressing. Native PPPoE client for large enterprise broadband ISP termination. Local DHCP server supporting up to 1024 internal IP leases for wired LAN endpoints and IoT devices. Static routing, policy-based routing (PBR), BGP, OSPF, EIGRP dynamic routing protocol support with full dual-stack IPv4/IPv6 inspection and routing capabilities. Mixed copper/SFP+ port + dual modular NM-2 design enables flexible multi-tier network segmentation: expandable copper access ports, long-distance 1G inter-site fiber links and high-speed 10G/40G/100G data center uplinks without external media converters.

4. Unified Threat Defense Security Stack

Built-in signature-based IDS engine with tens of thousands of enterprise threat detection rules; inline NGIPS inspection fully integrated on-chip after activating threat subscription licenses. Automatic dynamic host blacklisting to quarantine compromised internal or internet-facing endpoints post-breach detection. Strict/loose URPF anti-spoof filtering to block forged source IP traffic in multi-department large enterprise and hyperscale carrier MSP environments. Persistent large-capacity NVMe event logging + remote Syslog export to centralized enterprise SIEM platforms for PCI-DSS / HIPAA audit compliance. All administrative access encrypted via SSHv2 CLI, HTTPS ASDM/FDM GUI and SNMPv3 secure monitoring. Optional add-on threat subscriptions: AMP for Endpoints integration, Cloud Web Security, SecureX threat orchestration and real-time Talos global rule updates.

5. AAA Access Control & Audit Logging

Complete AAA authentication, authorization and accounting via external RADIUS and TACACS+ servers for tiered administrative privilege separation (operator / read-only / super admin). Local user credential database for standalone emergency login without external AAA servers. Comprehensive logging system supporting flash buffer storage, USB offloading and remote Syslog archival. SNMPv3 secure monitoring tracks real-time device health, throughput, PSU thermal status, VPN tunnel state and Firepower threat alerts. Front-panel LED alarm indicators trigger visual notifications for critical hardware faults and security incidents. Native ISE integration for user-identity-based policy enforcement across wired, wireless and remote access networks.

6. Application-Aware Hierarchical QoS Bandwidth Management

Four-level traffic priority queuing prioritizes real-time VoIP/video unified communications, business-critical SaaS and industrial SCADA traffic over streaming media and P2P background traffic. Per-port bandwidth shaping and policing on all native SFP+ and optional NM-2 fiber/copper interfaces to eliminate campus/enterprise core congestion and guarantee bandwidth for mission-critical traffic. DSCP marking preservation across IPsec and SSL VPN tunnels for consistent end-to-end QoS enforcement across national DMVPN architectures. QoS classification powered by AVC application signatures for granular per-application bandwidth allocation and traffic shaping.

Management & Configuration Tools

FTD / ASA CLI Console: IOS-style command-line interface accessible via serial console or encrypted SSHv2 remote access for scripting and advanced enterprise security troubleshooting.
ASDM / FDM Adaptive Security Device Manager: Dual embedded local HTTPS graphical web UIs for single-chassis configuration, real-time traffic dashboards, VPN monitoring and unified threat event reporting (FDM optimized for standalone simple deployments, ASDM for traditional ASA workflow).
Cisco Security Manager (CSM): Centralized enterprise policy platform supporting bulk multi-site Firepower deployment orchestration, mass firmware upgrades and cross-device compliance reporting, optimized for large-scale legacy ASA migration fleets.
Firepower Management Center (FMC): Primary centralized management for FTD NGFW mode, handling NGIPS rule sets, AVC application policies, malware sandboxing, URL filtering threat intelligence and AI-powered policy automation.
Cisco Defense Orchestrator (CDO): Cloud-hosted multi-device management for geographically distributed enterprise Firepower fleets, supporting zero-touch onboarding, cloud policy synchronization and unified SecureX orchestration.
TFTP + USB dual methods for OS firmware upload and full configuration backup/restore; offline config editing supported.

Key Differentiators vs Related Cisco Platforms

vs FPR4125-NGFW-K8 DES Base License: Full unrestricted 3DES/AES encryption, expanded VLAN/session limits, unlimited TLS proxy, 1000 multi-context virtualization and full dual-mode HA enabled; K8 lacks enterprise compliance encryption and high availability functions.
vs FPR4125-ASA-K9 ASA-Only Variant: Identical physical hardware chassis, but locked to classic ASA software instead of unified FTD NGFW; separate standalone IPS instead of integrated Snort 3, limited native SecureX/cloud orchestration, incompatible with full FMC unified threat management workflows.
vs FPR4120-NGFW-K9 Mid-High Tier Model: High-core dual Xeon split processors vs dual 14-core CPUs, larger 25M concurrent TCP/UDP sessions vs 20M, 45 Gbps full threat-inspected throughput vs 26 Gbps, 20,000 VPN peers vs 12,000 peers, expanded 1000 multi-context capacity vs 600 contexts, identical dual NM-2 expansion bay layout and dual redundant power supplies.
vs FPR4145-NGFW-K9 Flagship Top Tier Model: Lower overall raw/full-inspected throughput, smaller concurrent session/VPN limits, identical dual redundant power and NM-2 100G expansion capability, cost-optimized for large enterprise vs ultra-hyperscale carrier backbone workloads.
vs Secure Firewall 3130-NGFW-K9 Modern Active Platform: Dual independent NM-2 expansion slots (single NM-2 bay on 3100 series), native all-fiber 8×10G SFP+ fixed ports (no built-in copper), split Intel/Cavium dual-processor architecture vs unified single AMD chip, USB 2.0 instead of USB 3.1, dual redundant power supplies standard, discontinued EOL status vs active production lifecycle.
vs Discontinued FPR2140-NGFW-K9 Legacy Flagship: Two NM-2 expansion bays vs single expansion slot, native 8×10G SFP+ vs limited 4×10G SFP+, dual hot-swap redundant PSUs, massive 256GB ECC memory upgrade, hot-swappable NVMe SSD, far higher TLS decryption throughput, newer FIPS 140-3 certification, 1024 VLAN capacity vs 200 VLANs, support for up to 16 cluster nodes vs max 8 nodes.

Typical Hyperscale Enterprise & National Carrier Hub Deployment Scenarios

Large enterprise headquarters high-performance modular rack core security firewall isolating corporate production LAN, research DMZ and 10G/40G/100G fiber data center uplink, supporting up to 20,000 concurrent site-to-site IPsec tunnels and tens of thousands of remote worker AnyConnect VPN access, expandable via NM-2 100G QSFP fiber modules for additional inter-campus national backbone connections. Dual redundant hot-swappable power supplies ensure zero downtime for financial, healthcare and government regulated 24/7 compliance environments.
National multi-location retail central aggregation hub connecting hundreds of remote store POS networks; abundant native SFP+ fiber ports provide high-speed inter-store backbone links, copper NM-2 modules deployed for headquarters office access layer aggregation.
Multi-building large university core edge security appliance with 1000 multi-context virtual firewalls separating student, staff, administrative, research and medical network traffic zones, 10G SFP+ ports for inter-building high-speed fiber interconnections, expandable 100G NM-2 modules for campus ultra-high-speed cloud uplink aggregation.
Redundant Active/Active chassis pair for mission-critical large enterprise perimeter security and zero-downtime disaster recovery, dual redundant power circuits supported via separate rack PDUs for regulated industry continuous operation requirements.
National carrier MSP multi-tenant colocation rack core security gateway with 1000 independent multi-context virtual firewalls for fully isolated enterprise customer network segmentation, modular 10G/40G/100G fiber NM-2 uplinks linking hundreds of remote office and industrial client sites across regional markets.
High-performance legacy Firepower 4100 series network training lab platform for rack FTD deployment, NM-2 100G expansion module configuration, hyperscale Snort3 Firepower NGIPS application control and nationwide DMVPN hub-spoke fiber VPN architecture learning.

3. E-commerce Short Marketing Summary

Cisco FPR4125-NGFW-K9 High-Performance Modular 1RU Rack-Mount All-Fiber Multi-Speed SFP+ Next-Generation Firewall, discontinued legacy Cisco Firepower 4100 series Security Plus unrestricted K9 NGFW appliance with eight built-in 1/10G SFP+ high-speed fiber uplink ports, 1 dedicated NM-2 modular expansion bay supporting optional 10G/40G/100G fiber hardware bypass modules (shared with 4130/4145), dedicated out-of-band Gigabit management port, dual RJ45 serial + USB 2.0 console interfaces, dual hot-swappable redundant 1100W universal AC power supplies standard, dual high-core Intel Xeon split security processor architecture with upgraded 256GB DDR5 ECC memory, dual hot-swappable 900GB NVMe SSD slots with factory preinstalled storage, primary Firewall Threat Defense (FTD v7.6+) OS with optional ASA OS v9.x support. K9 license delivers full DES/3DES-AES strong encryption, unlimited internal host capacity, stateful SPI firewall, IPsec site-to-site/AnyConnect SSL remote access VPN, inline hardware Snort3 NGIPS intrusion prevention, AVC application visibility & control, NAT/PAT, PPPoE broadband client, unlimited TLS proxy for VoIP communications, up to 1000 multi-context virtual firewalls and dual Active/Standby/Active/Active stateful failover with native multi-device VPN clustering (max 16 nodes). Up to 45.0 Gbps full threat-inspected NGFW throughput, 25,000,000 concurrent TCP/UDP connections and 20,000 simultaneous IPsec VPN tunnels, managed via local ASDM/FDM GUI, serial console, Cisco Security Manager and Firepower Management Center. Discontinued high-performance rack-mount NGFW optimized for hyperscale enterprise headquarters, nationwide carrier central DMVPN aggregation hubs and multi-building large university 10G/40G/100G fiber core edge security deployments requiring dual redundant power, expandable 100G high-speed fiber uplink module bays and hyperscale multi-tenant virtualization capacity.

4. Product Catalog Keyword Tags

Cisco, FPR4125-NGFW-K9, Firepower 4100 Series High-Performance Modular 1RU Rack-Mount All-Fiber SFP+ Next-Generation Firewall, Legacy Hyperscale Enterprise National Carrier Core Stateful Inspection NGFW, Dual Hot-Swap Redundant Multi-Fan Front-to-Back Cooling 19-inch 1RU Rack Chassis, Dual Built-In Hot-Swap Redundant 1100W Internal Universal AC Power Supplies, 8 × 1/10GBase-X SFP+ Multi-Speed Native Fiber Uplink Ports, 2 × Independent NM-2 Modular Expansion Bays (FPR3K-XNM-8X10G / FPR3K-XNM-4X40G / FPR3K-XNM-2X100G Hardware Bypass Modules Supported), Dedicated Gigabit Out-of-Band Management 0/0 Port, RJ45 Serial Console Port, USB 2.1 Type-A Storage Port, DB-15 Inter-Chassis Stateful Failover Serial Port, Dual High-Core Intel Xeon Unified Split Security Processors with Native QuickAssist Crypto Offload, 256768 MB DDR5 ECC SDRAM, 16 GB System eMMC Boot Flash, Dual Hot-Swap U.2 NVMe SSD Drive Bays (1×900GB Factory Preinstalled), Cisco Firewall Threat Defense FTD Primary OS, Optional ASA OS Dual Software Support, Stateful Packet Inspection SPI, 45.0 Gbps Max Raw Firewall Throughput, 45.0 Gbps Max Full Threat-Inspected NGFW Throughput, 45.0 Gbps Standalone Snort 3 NGIPS Inspection Throughput, 19.0 Gbps Base Hardware-Accelerated 3DES/AES VPN Throughput (26.0 Gbps Offload Enabled), 8.5 Gbps TLS Hardware Decryption Throughput, Snort 3 NGIPS Threat Detection Engine, AMP for Networks Cloud Malware Sandbox Integration, URL Category Web Filtering (6000+ Recognized Applications / 280M+ Global URLs), IPsec IKEv1/IKEv2 DMVPN Site-to-Site & AnyConnect SSL/DTLS Remote Access VPN, Full DES/3DES-AES Unrestricted Strong Encryption Suite, L2 Wire-Speed Integrated Switch Functionality, Dual NM-2 Expandable Port Architecture Supporting 10G/40G/100G Uplinks, NAT PAT Static Dynamic Address Translation, PPPoE DSL Broadband Aggregation Client, VoIP H.323 SIP SCCP TLS Proxy Inspection, Transparent Layer 2 Firewall Mode, Multi-Context Virtual Firewall Segmentation (Up to 1000 Independent Contexts), Active/Standby & Active/Active Dual-Mode Stateful Failover Redundancy, Native Multi-Device VPN Clustering & Load Balancing (Max 16 Nodes), 1024 Logical Routed VLAN Maximum (Security Plus K9 License), 20000 Max Simultaneous IPsec/AnyConnect VPN Peers, 25,000,000 Concurrent TCP/UDP Connections, IEEE 1588v2 PTP Precision Time Protocol, Cisco AI Assistant for Automated Policy Tuning, ISE Identity Integration Support, ASDM/FDM Dual Embedded Local Web GUIs, Cisco Security Manager CSM Centralized Multi-Site Policy Orchestration, Firepower Management Center FMC Threat Rule Centralized Control, Cisco Defense Orchestrator CDO Cloud Multi-Device Zero-Touch Management, SecureX Threat Orchestration Integration, Syslog SNMPv3 Secure Monitoring, Full Dual-Stack IPv4/IPv6 Routing & Inspection Support, Application-Aware Hierarchical QoS Bandwidth Scheduling, FIPS 140-3 Level 1 FCC Class A Office Certified, Full NEBS Level 3 Telecom Qualified, End-of-Sale Legacy Platform (EoS Jan 6, 2026), Limited Remaining Cisco Long-Term EOL Maintenance Support, Security Plus K9 Unrestricted Upgrade Over FPR4125-NGFW-K8 DES Base License, Hyperscale Enterprise Headquarters Modular 1RU All-Fiber 10G/100G Edge NGFW, National Carrier Central DMVPN Aggregation Dual NM-2 Expandable Dual Redundant PSU High-Performance Security Appliance, Multi-Building Large University 1000-Context Multi-Tenant Virtual Segmentation High-Performance Rack Firewall, Direct Hardware Upgrade Replacement for Discontinued Flagship FPR2140 Legacy Rack Appliance

Naming Rule Explanation

FPR: Legacy Firepower hardware prefix for discontinued Firepower 4100 dual NM-2 modular rack security appliances
4125: High-performance dual expansion bay rack-mount national hyperscale enterprise/carrier core hardware model identifier within Firepower 4100 legacy platform
NGFW: Abbreviation for Next-Generation Firewall, signifies factory PID licensed to run unified Firewall Threat Defense (FTD) primary operating system (distinguishes from ASA-only FPR4125-ASA-K9 PID)
K9: Premium unrestricted Security Plus license identifier unlocking full AES encryption, expanded session/VLAN capacity, unlimited TLS proxy, up to 1000 multi-context virtual firewalls and dual-mode Active/Standby + Active/Active stateful failover; contrasted with K8 base DES-only restricted license
Hardware Distinction Note: FPR4125-NGFW-K9 is the high-performance dual-NM modular rack model of discontinued Firepower 4100 generation, sharing identical rack chassis dimensions with FPR4110/4112/4115/4145 rack appliances, differentiated by dual high-core Intel Xeon split security processors, 256GB DDR5 ECC memory, dual hot-swappable redundant power supplies, dual independent NM-2 expansion bays supporting 100G QSFP uplink modules, 25M concurrent sessions and 20,000 VPN peer limit, with native copper-free all-fiber 8×1G/10G SFP+ port layout plus dual independent NM-2 expansion bays. This product reached Cisco End-of-Sale on January 6, 2026, replaced by the next-generation Secure Firewall 4200 series, with limited residual official TAC support lifecycle remaining.


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