Cisco ISR4331/K9 Integrated Services Router — Enterprise Branch Routing at a Fraction of the Cost

Save up to 70% over new pricing on this refurbished Cisco ISR 4331 router. Ideal for medium branch offices, the ISR4331/K9 delivers enterprise-class routing, security, and SD-WAN readiness in a compact 1RU form factor — backed by Reef Telecom's industry-leading 10-year warranty.

Key Specifications

• Throughput: 100 Mbps default, upgradeable to 300 Mbps with performance license
• WAN/LAN Ports: 3 onboard Gigabit Ethernet (1 combo RJ-45/SFP + 1 RJ-45 + 1 SFP)
• Expansion: 2 NIM slots, 1 ISC slot (PVDM4), 1 SM-X slot (single/double-wide)
• Memory: 4 GB DRAM (expandable to 16 GB) / 4 GB Flash (expandable to 16 GB)
• Software: Cisco IOS XE with IP Base license
• Form Factor: 1RU rack-mountable
• Power: Internal AC, up to 250W; optional PoE support
• Security: Zone-based firewall, IPsec/SSL VPN, DMVPN, GETVPN
• Routing Protocols: OSPF, BGP, EIGRP, IS-IS, static IPv4/IPv6
• Management: Cisco DNA Center, CLI, SNMP, RESTCONF, SD-WAN (vManage) ready

Why Buy from Reef Telecom?

• ✅ 10-Year Warranty — the longest in the refurbished telecom industry
• ✅ Free Shipping on orders over $300
• ✅ Every unit professionally tested and certified before shipment
• ✅ Trusted by enterprise IT teams nationwide

Ideal Use Cases

The Cisco 4331 ISR is perfect for enterprise branch offices, SD-WAN deployments, MPLS/internet dual-connectivity, VPN concentrators, and unified communications (SRST/CME). Its modular design consolidates WAN, security, voice, and application services onto a single platform — reducing appliance sprawl and simplifying management.

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.