Cisco ISR4321/K9 Router Condition: Refurbished / Used Type: Integrated Services Router (ISR) WAN Ports: 2 × GE WAN, 1 × RJ45, 1 × SFP LAN Ports: 2 × GE LAN Performance: Up to 50 Mbps default throughput (upgradeable) Expansion: 1 NIM slot, 1 SM slot, 1
The Cisco ISR4321/K9 Router is a compact, high-performance 1U rack-mount router from the Cisco 4000 Series—ideal for small to medium-sized enterprise branches. It delivers secure routing, integrated services, and flexible deployment with support for SD‑WAN, unified communications, and advanced security. Designed with Cisco’s pay-as-you-grow licensing, performance can be upgraded from 50 Mbps to 100 Mbps without hardware replacement.
Modular Ports: 2 x 10/100/1000 RJ‑45 ports (WAN/LAN), 1 x 1 Gbps SFP port
Expansion Slots: 2 NIM slots and 1 onboard ISC slot for flexible interface/module support
Performance Upgrade: Default ~50 Mbps throughput, upgradable to ~100 Mbps with performance license
Scalable Memory: 4 GB DDR3 ECC DRAM (max up to 8 GB), 4 GB Flash (upgradable to 8 GB)
Security & VPN: Hardware-accelerated IPsec, TLS, SSL VPN, advanced ACL and NAT capabilities
Dynamic Routing: Supports OSPF, BGP, EIGRP, RIP; integrated firewall and QoS
Management Ports: Includes console (RJ‑45), USB Type A, Mini‑USB type B, and AUX ports
Compact & Efficient: Compact 1RU chassis, efficient power usage ranging from 36 W to 125 W depending on load and modules
| Specification | Details |
|---|---|
| Model | Cisco ISR4321/K9 |
| Form Factor | 1U Rack-Mountable |
| Onboard Ports | 2 × 1 GbE RJ‑45, 1 × 1 GbE SFP |
| NIM Slots | 2 |
| ISC Slot | 1 |
| DRAM | 4 GB DDR3 ECC (upgradable to 8 GB) |
| Flash Memory | 4 GB (upgradable to 8 GB) |
| Throughput (default/upgradable) | ~50 Mbps (up to 100 Mbps with license) |
| Supported Routing Protocols | OSPF, BGP, RIP, EIGRP |
| VPN Support | IPsec VPN, SSL VPN, TLS, NAT, Firewall |
| Management Ports | Console RJ‑45, AUX RJ‑45, USB Type A, Mini‑USB |
| Power Supply | External AC (100–240 VAC), no redundancy |
| Typical / Max Power Draw | 36 W / 125 W |
| Dimensions (H × W × D) | ~1.8 × 14.5 × 11.6 in (44.6 × 369.6 × 294.6 mm) |
| Weight | ~7.72 lbs (3.5 kg) |
| Operating Temp / Humidity | 0 °C–40 °C; 5%–85% non-condensing |