Cisco ISR4321/K9 — Enterprise Branch Router with 10-Year Warranty

Save up to 80% over list price on this fully tested, refurbished Cisco 4321 Integrated Services Router. The ISR4321/K9 delivers secure, high-performance WAN routing for small to mid-size enterprise branch offices — with SD-WAN readiness, advanced security, and scalable throughput in a compact 1RU rack-mountable chassis.

Key Specifications

• Part Number: ISR4321/K9
• Throughput: 50 Mbps default, upgradable to 100 Mbps via performance license (FL-4320-PERF-K9)
• WAN/LAN Ports: 2x onboard Gigabit Ethernet (10/100/1000) — 2 RJ-45 + 1 SFP
• Expansion: 2 NIM slots, 1 ISC slot for modular flexibility (LTE, T1/E1, EtherSwitch)
• Memory: 4 GB Flash / 4 GB DDR3 DRAM (expandable to 16 GB Flash / 8 GB DRAM)
• Form Factor: 1RU rack-mountable or wall-mountable
• Software: Cisco IOS XE with support for SD-WAN, DMVPN, IPsec VPN, QoS, NAT, and Zone-Based Firewall
• Management: 1 RJ-45 console port, 1 auxiliary port, 1 USB 2.0 port

Why Buy from Reef Telecom?

• ✅ Industry-leading 10-year warranty on all refurbished equipment
• ✅ Free shipping on orders over $300
• ✅ Every unit professionally inspected, tested, and certified before shipment
• ✅ Trusted by IT professionals and enterprises nationwide

Ideal Use Cases

The Cisco 4321 ISR is the go-to router for enterprise branch offices, retail locations, and remote sites that require secure WAN connectivity, VPN termination, and converged services including voice (SRST/CUBE) and application-aware routing. Fully compatible with Cisco SD-WAN (Viptela) controller deployments and traditional IOS XE dynamic routing configurations.

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.