Cisco ISR4451-X/K9 — Enterprise Branch Router with 1-2Gbps Throughput

Save up to 80% over list price on this professionally refurbished Cisco 4451-X Integrated Services Router. Ideal for enterprise branch offices, WAN aggregation, and SD-WAN deployments, the ISR4451-X/K9 delivers high-performance routing with built-in security, voice, and application-aware services — all in a single, scalable platform.

Key Specifications

• Part Number: ISR4451-X/K9
• Throughput: 1 Gbps default, scalable to 2 Gbps with performance license
• WAN/LAN Ports: 4x onboard Gigabit Ethernet (RJ-45) + 4x SFP
• Expansion Slots: 3x NIM, 1x ISC, 2x SM-X (Enhanced Service Module)
• Memory: 4 GB DRAM (control plane) / 2 GB DRAM (data plane), 8 GB Flash
• CPU: 10-core multi-service processor
• Security: IPsec VPN, DMVPN, FlexVPN, Zone-Based Firewall, SSL
• Software: Cisco IOS XE with IWAN, NBAR, AVC support
• Power: Internal AC (100-240V auto-ranging), redundant PSU option
• Form Factor: 2U rack-mountable

Why Buy from Reef Telecom?

• Industry-leading 10-year warranty on all refurbished equipment
• Free shipping on orders over $300
• Professionally tested and certified to full operational standards
• Same-day shipping available on in-stock items

Ideal Use Cases

The Cisco 4451-X is the top-tier router in the ISR 4000 Series, purpose-built for large enterprise branch offices, regional hub sites, and WAN aggregation. It supports SD-WAN, Cisco Unified Communications (CUBE), advanced security services, and UCS-E compute modules — making it the go-to choice for converged branch infrastructure.

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.