The Cisco ISR 4351 Integrated Services Router is a high-performance branch router built for secure, scalable, and intelligent service integration. With 3 onboard Gigabit Ethernet ports, 3 NIM slots, and 2 SM slots, this modular unit provides unmatched flexibility for WAN, voice, security, and compute functions in a compact 1RU chassis.
Powered by 4GB DDR3 ECC DRAM and 4GB flash memory, the ISR 4351 offers up to 400 Mbps aggregate throughput and supports multiple advanced protocols, USB interfaces, and serial management. It's the ideal platform for future-ready branch networks requiring performance, redundancy, and virtualization capabilities.
Key Features
Aggregate throughput scalability from 200 Mbps to 400 Mbps for high-performance branch deployments
3 onboard 10/100/1000 Gigabit Ethernet ports support RJ-45 and SFP interfaces for flexible LAN/WAN access
3 NIM slots and 2 SM slots allow modular expansion for voice, storage, or WAN optimization services
4 GB DDR3 ECC DRAM enables robust multi-service performance across control, service, and data planes
4 GB flash memory included by default with upgrade path to 16 GB for advanced IOS-XE feature sets
Supports hot-swappable modules (OIR) for minimal downtime during upgrades
2 USB 2.0 ports (Type A) and 1 mini-USB console port for modern local management options
Serial console and auxiliary ports (RJ-45) for legacy and CLI-based control
Internal AC power supply supports 100240V with PoE-capable configuration options
Designed for Cisco IP Base, supporting secure WAN, NetFlow, VPN, QoS, and advanced routing
Ideal Uses
High-capacity enterprise router for branch networks requiring scalable throughput and modular services
Secure multi-service edge platform for data, voice, video, and virtualization integration
Modular router for financial, healthcare, or retail branches needing hardware-accelerated performance
Future-proofed CPE for service providers deploying SD-WAN, MPLS, or hybrid WAN architectures
Specifications
Condition: Refurbished device with minor scratches and scuffs. Device has been extensively tested and is fully functional.
Model: Cisco ISR4351/K9
Brand: Cisco
Form Factor: Rack-mountable Modular 1U
Aggregate Throughput: 200 Mbps to 400 Mbps
Ethernet Ports: 3 x 10/100/1000 (RJ-45 and SFP capable)
NIM Slots: 3
SM Slots: 2 (1 doublewide if no singlewide installed)
OIR Support: Yes (hot-swappable I/O modules)
DRAM: 4 GB DDR3 ECC (expandable to 16 GB)
Flash Memory: 4 GB (expandable to 16 GB)
USB Ports: 2 x USB 2.0 (Type A), 1 x Mini-USB console
Serial Ports: 1 x RJ-45 console, 1 x RJ-45 auxiliary
Power Supply: Internal AC (100240V, 4763Hz, 7.13.0A)
Typical Power Usage: 48W (no modules)
Max Power: 430W (platform only), 990W with PoE PSU
PoE Output: Up to 500W available
Dimensions: Standard 1RU (W x D x H not provided in original spec)
Warranty: 3 Month Carry-in Warranty
What's in the Box: Router, Power Cable
