Cisco ISR 4431 Integrated Services Router (ISR4431/K9) — Refurbished

Save up to 80% over new list price on this enterprise-grade Cisco ISR 4431 router. Professionally inspected, tested, and restored to factory specifications, this refurbished ISR4431/K9 delivers the same high-performance WAN routing, advanced security, and SD-WAN readiness as new — backed by Reef Telecom's industry-leading 10-year warranty.

Key Specifications

• Part Number: ISR4431/K9
• Aggregate Throughput: 500 Mbps to 1 Gbps
• Onboard Ports: 4x Gigabit Ethernet (RJ-45/SFP combo)
• NIM Slots: 3 Network Interface Module slots
• ISC Slot: 1 onboard ISC slot
• SM-X Slot: 1 Enhanced Service Module slot
• Flash Memory: 8 GB default (expandable to 32 GB)
• DRAM: 4 GB control plane (max 16 GB) / 2 GB data plane
• Form Factor: 1U rack-mountable
• Power: Dual AC/DC power supply support, PoE capable
• Software: Cisco IOS XE with IP Base license

Features & Benefits

• Multicore CPU architecture with separate control, data, and services planes for consistent performance under heavy load
• SD-WAN ready with Cisco DNA Center and Cisco SD-WAN support
• Built-in encryption acceleration and embedded IPsec VPN hardware
• Supports voice, video, security, and WAN optimization services concurrently
• Modular design with NIM, ISC, and SM-X expansion for future scalability

Ideal Use Cases

The Cisco 4431 ISR is ideal for enterprise branch offices, medium-sized business WAN deployments, SD-WAN migrations, and converged branch infrastructure requiring integrated security, voice, and routing in a single 1U platform.

Free shipping on orders over $300. All refurbished equipment from Reef Telecom includes our 10-year warranty and is fully tested before shipping.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.