Cisco ISR4351/K9 Router: High-Performance Integrated Services

Product Description

The Cisco ISR4351/K9 is a modular enterprise router from the Cisco ISR 4000 series, designed for medium and large business networks requiring high-performance routing, security, and WAN aggregation. This model integrates 3 Gigabit Ethernet ports, 3 network interface module slots, and 2 service module slots, providing scalable connectivity and service flexibility for demanding B2B deployments.

Technical Specifications

• Model: Cisco ISR4351/K9
• MPN: ISR4351/K9
• Brand: Cisco
• Category: Network equipment, modems
• Ports: 3 x Gigabit Ethernet (GE)
• Network Interface Module (NIM) slots: 3
• Service Module (SM) slots: 2
• Flash memory: 4 GB
• DRAM: 4 GB
• Software license: IP Base (IPB)

Design Features

• Modular chassis supporting dual NIM and SM architecture for extended interface options.
• Integrated hardware-based encryption and security acceleration for VPN and firewall services.
• Compact 1U form factor suitable for rack-mounted installations in enterprise wiring closets.
• Redundant power supply and fan options (per platform design) for high availability.
• Unified management interface compatible with Cisco IOS XE software.

Application Area

The Cisco ISR4351/K9 is deployed as a WAN edge router in enterprise branches and regional offices across Poland and Central Europe, handling inter-site VPN traffic, internet breakout, and dynamic routing protocols. Its modular design suits environments requiring incremental upgrades to interface modules or service modules without full hardware replacement, including multi-tenant offices, financial institutions, and logistics centers with mixed legacy and modern network infrastructure.