Cisco ISR4451-X/K9 Modular Gigabit Ethernet Router

$151.30 (Ex. GST)

In stock: 4

Cisco ISR4451-X/K9 Modular Gigabit Ethernet Router

Model / Part Number: ISR4451-X/K9

Series: Cisco 4000 Series Integrated Services Router (ISR 4451-X)

Form Factor: 1RU rack-mountable

Throughput: Up to 4 Gbps (aggregate); 1 Gbps encrypted (IPsec)

Default License: IP Base (upgradable to Security, UC, AppX, or full UC license bundles)

Onboard Ports: 4 × 10/100/1000 RJ-45 (GE0/0/0 to GE0/0/3)

Expansion Slots: 3 × NIM (Network Interface Module), 1 × SM-X, 1 × ISM

Power Supplies: Default single 500W AC; optional dual redundant 500W

Fans: Redundant hot-swap fans (front-to-back airflow)

Status (2025–2026): Legacy / End-of-Sale / End-of-Support – Cisco ended support for ISR 4000 series years ago; still widely used in branch networks

Market Availability: Refurbished or used pulls from decommissioned branch offices

Common Sources: eBay, Amazon (renewed), surplus networking resellers (Renewtech, ServerSupply, NTC-Tech)

Typical Price Range: $500–$1,500 (refurbished, depending on condition, licenses, and modules)

Processor: Multi-core CPU (Cisco QuantumFlow Processor)

DRAM: 4 GB (default; expandable to 16 GB)

Flash: 8 GB (default; expandable)

Onboard LAN Ports: 4 × 10/100/1000 RJ-45

Expansion Slots:
3 × NIM slots (e.g., NIM-2MFT-T1/E1, NIM-4G-LTE, NIM-ES2-4, NIM-1GE-CU-SFP)
1 × SM-X slot (e.g., SM-X-72FXS/DID voice module)
1 × ISM slot (e.g., ISM-VPN-3DES/3DES-AES)

Maximum Throughput: 4 Gbps (aggregate routing); 1 Gbps IPsec VPN (with boost license)

Power Consumption: ≈150–250W typical (varies with modules)

Redundant Power: Optional dual 500W AC hot-swap PSUs

Cooling: Redundant hot-swap fans (front-to-back airflow)

Management: Cisco IOS-XE CLI, web GUI (limited), Cisco Prime Infrastructure, DNA Center (limited support)

Operating Temperature: 0°C to 40°C (32°F to 104°F)

Dimensions: 1RU – 43.8 cm (W) × 43.8 cm (D) × 4.4 cm (H)

Weight: ≈8.4 kg (18.5 lb) base; up to 12 kg fully loaded

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