FortiGate 3700F
Ultra-low-latency ports at 1.45 µs — built for trading and real-time workloads
- Threat protection
- 75 Gbps
- Firewall throughput
- 589 Gbps
- IPsec VPN
- 160 Gbps
- Concurrent sessions
- 140 Million
Front panel
- QSFP cage
- SFP cage
- RJ45 copper
The 3700F carries four dedicated ultra-low-latency 25GE SFP28 ports that drop firewall latency to 1.45 µs, against 3.56 µs on its standard ports. Alongside them sit four 400GE QSFP-DD and twenty 50GE SFP56 interfaces, with 75 Gbps threat protection.
Bought almost exclusively for the ULL ports. In electronic trading, market data distribution and similar workloads, two microseconds of firewall latency is a measurable business cost, and this is the only FortiGate that addresses it directly. For everything else, the 3500G offers more inspection in less space.
Highlights
- 1.45 µs firewall latency on ULL ports — the lowest in the range
- 4x 400GE QSFP-DD, 20x 50GE SFP56
- 75 Gbps threat protection, 190 Gbps application control
- 140 million concurrent sessions
Typical deployments
- Electronic trading and market-data infrastructure
- Real-time industrial and telemetry networks
- Any workload where microseconds are a business metric
The numbers, with their conditions
Every figure below is Fortinet's own, with the test conditions it was measured under.
Performance
Fortinet's published figures. Firewall throughput is measured on UDP with no inspection enabled — size your deployment on threat protection throughput instead, which is measured with firewall, IPS, application control and malware protection all running against an enterprise traffic mix.
| Firewall throughput (1518 / 512 / 64 byte UDP) | 589 / 589 / 420 Gbps |
|---|---|
| IPsec VPN throughput (512 byte)IPsec VPN performance test uses AES256-SHA256. | 160 Gbps |
| IPS throughput (enterprise mix)IPS, application control, NGFW and threat protection are measured with logging enabled. | 86 Gbps |
| NGFW throughput (enterprise mix)NGFW performance is measured with firewall, IPS and application control enabled, enterprise mix traffic. | 80 Gbps |
| Threat protection throughput (enterprise mix)Threat protection performance is measured with firewall, IPS, application control and malware protection enabled, enterprise mix traffic. | 75 Gbps |
| SSL inspection throughput (IPS, avg. HTTPS)SSL inspection performance values use an average of HTTPS sessions of different cipher suites. | 55 Gbps |
| Application control throughput (HTTP 64K) | 190 Gbps |
| Firewall latency | 3.56 µs / 1.45 µs |
Capacity
| Concurrent sessions | 140 Million |
|---|---|
| New sessions / second | 930,000 |
| Firewall policies | 200,000 |
| Max gateway-to-gateway IPsec tunnels | 40,000 |
| Max client-to-gateway IPsec tunnels | 200,000 |
| SSL VPN throughput | 16 Gbps |
| Concurrent SSL VPN users (recommended max, tunnel mode) | 30,000 |
| Virtual domains (default / max) | 10 / 500 |
Security Fabric capacity
How much of the rest of the Fabric this model manages directly, with no separate controller.
| Max managed FortiAPs (total / tunnel) | 4,096 / 2,048 |
|---|---|
| Max managed FortiSwitches | 300 |
| Max FortiTokens | 20,000 |
Hardware
| Interfaces | 4x 400GE QSFP-DD, 4x ULL 25GE SFP28, 20x 50GE SFP56, 2x 10GE RJ45 |
|---|---|
| Local storage | 2x 1.92 TB (3701F) |
| Power supplies | Dual PS |
| Form factor | 2 RU |
| Variants | — |
Model-specific caveats
Fortinet conditions that apply to this model in particular. Worth reading before you order.
| Note 1 | The second latency figure is achieved with ultra-low-latency ports. |
|---|
Sources
- Fortinet Product Matrix — FortiGate Network Security Platform (July 2026) — retrieved 2026-09-01
Reproduced from Fortinet published documentation and subject to change without notice. Where a figure is load-bearing for your design, ask us to confirm it in writing before you order — we will.
Buyers also compare
FortiGate 3500G
105 Gbps threat protection and 400GE optics — the inspection flagship of 2 RU
FortiGate 3200F
400GE QSFP-DD optics with 45 Gbps threat protection
FortiGate 3800G
200 Gbps threat protection — the highest inspected throughput outside a chassis