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