FPR4125-ASA-K9 – 80G ASA Firewall – 45G Multiprotocol – 800GB SSD

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FPR4125-ASA-K9 Description

The FPR4125-ASA-K9 is a Cisco Secure Firewall 4100 Series Firepower 4125 ASA appliance for large internet-edge and data center perimeters. The 1RU appliance delivers 80 Gbps of stateful inspection throughput, 25 million concurrent connections and 19 Gbps of IPsec VPN, and it ships with dual 1100W AC supplies and an 800 GB SSD. The 4125 is the only 4100 Series model certified for NEBS operation.

Quick Specs

Parameter

Specification

Product ID

FPR4125-ASA-K9

Product type

Cisco Firepower 4125 ASA appliance

Firewall model

FPR-4125

Security software role

Cisco Secure Firewall ASA

Form factor

1RU

Memory

192 GB

On-chassis data ports

8 x 1/10 Gigabit Ethernet SFP+

Network module bays

2

Stateful inspection firewall throughput

80 Gbps

Multiprotocol firewall throughput

45 Gbps

Concurrent firewall connections

25 million

IPsec VPN throughput

19 Gbps

Default power supply

Two FPR4K-PWR-AC-1100 1100W AC supplies

Product Performance

Stateful Inspection Firewall Throughput
Multiprotocol Firewall Throughput
Concurrent Firewall Connections

Key Features

NEBS Certification

The 4125 is the only 4100 Series model certified for NEBS. Its profile allows 0 to 45 C up to 6,000 ft, 0 to 35 C from 6,000 to 13,000 ft, and short-term excursions from -5 to 50 C.

Multiprotocol Throughput

Stateful inspection is rated at 80 Gbps and multiprotocol traffic at 45 Gbps, which is the figure that tracks mixed real-world application traffic more closely.

Connection Setup Rate

The appliance holds 25 million concurrent connections and sets up 1.1 million new connections per second, which matters for edges that see many short-lived flows.

VPN Scale

IPsec VPN reaches 19 Gbps with up to 20,000 peers, enough headroom for a large remote-access population plus site-to-site tunnels on one unit.

Dual Supplies As Shipped

Both 1+1 power slots arrive filled with 1100W AC supplies, so redundancy needs no extra module. A 950W DC supply remains an option for DC-fed sites.

Memory And Storage

192 GB of memory pairs with an 800 GB primary SSD in slot 1, which hosts the ASA logical device and must stay installed.

Application Scenarios

Telecom Facility Perimeter

In a central office or carrier facility that follows NEBS requirements, the appliance runs ASA policy at the site edge and operates at altitudes up to 13,000 ft under its NEBS profile.

High-Volume VPN Concentrator

A headquarters that terminates site-to-site and remote-access tunnels can use the appliance as the IPsec endpoint, with 19 Gbps of VPN throughput and capacity for 20,000 peers.

Large-Session Data Center Edge

A data center edge that fronts web and application farms can hold 25 million concurrent connections and set up 1.1 million new connections per second behind the upstream routers.

Product Comparison

Parameter

FPR4125-ASA-K9

FPR4115-ASA-K9

FPR4145-ASA-K9

Stateful inspection firewall throughput

80 Gbps

80 Gbps

80 Gbps

Multiprotocol firewall throughput

45 Gbps

40 Gbps

50 Gbps

Maximum concurrent sessions

25 million

15 million

40 million

IPsec VPN throughput

19 Gbps

15 Gbps

23 Gbps

Maximum VPN peers

20,000

15,000

20,000

Memory

192 GB

192 GB

384 GB

Storage

800 GB

400 GB

800 GB

Power supply

Dual 1100W AC

Single 1100W AC; dual optional; single or dual 950W DC optional

Dual 1100W AC

NEBS

Certified

Not certified

Not certified

FPR4125-ASA-K9 and FPR4115-ASA-K9 both list 80 Gbps of stateful inspection, but FPR4125-ASA-K9 raises multiprotocol throughput from 40 to 45 Gbps, connections from 15 to 25 million and IPsec VPN from 15 to 19 Gbps, and ships with an 800 GB SSD and two 1100W AC supplies instead of 400 GB and one. A site that needs NEBS operation must use FPR4125-ASA-K9, the only certified model in the Firepower 4100 Series. Beyond 25 million connections or 19 Gbps of IPsec, FPR4145-ASA-K9 lists 40 million connections, 23 Gbps and 50 Gbps of multiprotocol throughput on 384 GB of memory. Sites that run Threat Defense instead of ASA order FPR4125-NGFW-K9, which lists 45 Gbps of firewall and IPS throughput.

Ordering Checklist

  • ASA licenses: Order the Base license L-FPR4100-ASA=, the free encryption license L-FPR4K-ENC-K9=, and L-FPR4K-ASASC-10= for each extra block of 10 security contexts. ASA models run on Smart Licensing, and the 10 contexts included stop at that count unless more are ordered.
  • Smart Software Licensing account: Set up an account for the end customer, or link the existing account to the order. The account is required before the order is placed, so the licenses have nowhere to be deposited otherwise.
  • Network modules: Decide which of FPR4K-NM-8X10G, FPR4K-NM-4X40G or FPR4K-NM-2X100G goes in the two bays; FPR4K-NM-2X100G needs ASA 9.18.1 or later. The bays ship empty of modules beyond the eight fixed SFP+ ports, and an unsupported release cannot use the 100G module.
  • Power supplies: Two FPR4K-PWR-AC-1100 supplies ship by default; choose FPR4K-PWR-DC-950 only where the site feeds DC. The second slot is 1+1 redundancy; DC and blank-panel choices are separate PIDs.
  • Power cords: Order one cord per supply in the destination country’s standard; orders to Argentina, Brazil and Japan must include the matching cord. Those destinations cannot be shipped without the cord ordered on the system.

Optional Add-ons

Model

Description

FPR4K-NM-8X10G

8-port 10-Gbps SFP+ network module

FPR4K-NM-4X40G

4-port 40-Gbps QSFP+ network module

FPR4K-NM-2X100G

2-port 100-Gbps single-wide network module

FPR4K-NM-8X1G-F

8-port 1-Gbps copper hardware bypass network module

FPR4K-NM-6X1SX-F

6-port 1-Gbps SX fiber hardware bypass network module

FPR4K-NM-6X10SR-F

6-port 10-Gbps SR hardware bypass network module

FPR4K-NM-6X10LR-F

6-port 10-Gbps LR hardware bypass network module

FPR4K-NM-2X40G-F

2-port 40-Gbps SR hardware bypass network module

FPR4K-PWR-AC-1100

1100-W AC power supply module

FPR4K-PWR-DC-950

950-W DC power supply module

FPR4K-SSD800

800-GB SSD for Firepower 4125 and 4145

FPR4K-S-FAN

Firepower 4100 fan module

FPR4K-RACK-MNT

Rack-mount kit

FPR4K-CBL-MGMT

Cable management brackets

Specifications

Parameter Specification Parameter Specification
Product ID FPR4125-ASA-K9 Product type Cisco Firepower 4125 ASA appliance
Firewall model FPR-4125 Security software role Cisco Secure Firewall ASA
Rack units 1RU Memory 192 GB
Storage 800 GB Dimensions 1.75 x 16.89 x 29.7 in. (4.4 x 42.9 x 75.4 cm)
Weight 17.87 kg (39.4 lb) with 2 power supplies, 2 network modules, and 6 fans On-chassis data ports 8 x 1/10 Gigabit Ethernet SFP+
Network module bays 2 Maximum interface expansion Up to 4 x 100GE QSFP28, 24 x 10GE SFP+, 8 x 40GE QSFP+, or 24 x 1GE ports with network modules and fixed ports
Management port 1 Gigabit Ethernet SFP port Management optics Supports 1Gbps fiber or copper optical modules
Serial port 1 x RJ-45 console USB port 1 x USB 2.0
Airflow Front to rear Stateful inspection firewall throughput 80 Gbps
Multiprotocol firewall throughput 45 Gbps Concurrent firewall connections 25 million
New connections per second 1.1 million Firewall latency 3.5 microseconds with UDP 64B test traffic
IPsec VPN throughput 19 Gbps Maximum VPN peers 20000
Security contexts 10 included; 250 maximum High availability Active/active or active/standby
Clustering Up to 16 appliances Centralized management Cisco Security Manager or Cisco Defense Orchestrator
Local management Adaptive Security Device Manager Minimum 100G module software FPR4K-NM-2X100G first supported in FTD 7.2 and ASA 9.18
100G module FXOS support FPR4K-NM-2X100G supported on Firepower 4100 series with FXOS 2.13 and later Power supply configuration Dual 1100W AC
Power redundancy 1+1 AC input voltage 100 to 240V AC
AC maximum output power 1100W DC input voltage -40V to -60VDC
DC maximum output power 950W Fan modules 6 hot-swappable fans
Fan redundancy 5+1 Mounting 4-post EIA-310-D rack mount rails included
NEBS operation Supported on FPR-4125 platform Operating temperature 32 to 104F (0 to 40C) or NEBS operation profile for FPR-4125
Operating humidity 5 to 95% noncondensing Operating altitude 10000 ft maximum; 13000 ft maximum under FPR-4125 NEBS operation
Noise 63 dBA typical; 74 dBA maximum Supported SSD FPR4K-SSD800 for Firepower 4125 and 4145
Supported power cord rule Only approved power cords or jumper power cords provided with the security appliance are supported

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Need pricing, stock, or shipping details for the FPR4125-ASA-K9 ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email [email protected] for a fast quotation.

Quality Certifications

Customer Reviews

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    Steven Sanders
    Posted on 25/03/2026
    Verified Buyer
    5.0

    Our receiving inspection found zero defects. Clean product.

    Christine Walker
    Posted on 19/03/2026
    Verified Buyer
    4.0

    Reached out about a future order — they remembered us and made the new quote easy. Shipping took a couple extra days, but product itself is perfect.

    Klaus Lewis
    Posted on 09/03/2026
    Verified Buyer
    5.0

    We got premium product without the premium pricing markup.

Questions & Answers

  • Which FXOS release does FPR4K-NM-2X100G need in FPR4125-ASA-K9?

    FPR4K-NM-2X100G needs FXOS 2.13 or later in FPR4125-ASA-K9, plus ASA 9.18.1, per the FXOS compatibility guide and hardware installation guide. The 4-port 100G module and the double-wide FPR9K-DNM-2X100G are not supported on the 4100 chassis.
  • Which slots take network modules in FPR4125-ASA-K9, and how are empty slots covered?

    Network modules go in slots 2 and 3 of FPR4125-ASA-K9. Empty slots take the FPR4K-NM-BLANK= cover. Copper SFPs in FPR4K-NM-8X10G can fill only one row, upper or lower, per the Secure Firewall 4100 hardware installation guide.
  • What is the maximum VLAN count on FPR4125-ASA-K9?

    The maximum VLAN count on FPR4125-ASA-K9 is 1,024, per the ASA 9.22 license limits table. That table also lists 25,000,000 concurrent connections and 20,000 VPN peers for the appliance, so VLAN count is a design limit set by the license table, not by port count.
  • How deep and how heavy is FPR4125-ASA-K9 with two power supplies and two network modules?

    FPR4125-ASA-K9 measures 1.75 x 16.89 x 29.7 in. (4.4 x 42.9 x 75.4 cm) and weighs 17.87 kg (39.4 lb) with 2 power supplies, 2 network modules and 6 fans. The 29.7 in. depth is the figure to check against the rack.

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