Cisco ISR4351/K9 Router – w/3 Gigabit Ethernet Ports, 3 NIM, 4G Flash, 4G DRAM, IP Base

The Cisco ISR4351-K9 Router is a high-performance integrated services router designed to meet the demanding needs of modern enterprise networks. Built on Cisco’s industry-leading architecture, it combines powerful routing capabilities with modular flexibility to support WAN aggregation, secure connectivity, voice services, and advanced application performance. The router includes three onboard 10/100/1000 Mbps Gigabit Ethernet RJ-45 ports and three 1 Gbps SFP fiber uplink ports, offering versatile copper and fiber connectivity options for LAN and WAN interfaces.

Powered by Cisco IOS XE, the ISR4351-K9 supports a wide range of networking protocols, routing services, and security features, making it suitable for branch offices, campus cores, and hybrid cloud interconnects. Standard memory and flash provide a solid base for services, with 4 GB of installed DRAM and 4 GB of flash memory, both of which are expandable up to 16 GB to accommodate future needs and performance upgrades.

This router’s modular design includes three Network Interface Module (NIM) slots, two Service Module (SM-X) slots, and one Integrated Services Card (ISC) slot, allowing organisations to tailor interfaces, security, voice, and WAN optimization capabilities to specific requirements. Its aggregate throughput supports efficient data flow across multiple services, while support for advanced routing, VPN, QoS, and security features enhances application performance and connectivity reliability.

The Cisco ISR4351-K9 is engineered for enterprise-grade flexibility, durability, and operational efficiency. It supports various power options and can be deployed in rack environments to provide robust performance and long-term scalability for growing networks that demand secure, high-availability connectivity.

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Technical Specifications

Performance & Throughput

• Aggregate Throughput: ~200 Mbps to ~400 Mbps (configurable with performance options)
• Architecture: Cisco IOS XE operating system for advanced networking services

Ports & Connectivity

• 3 × Gigabit Ethernet (10/100/1000 Mbps) RJ-45 ports
• 3 × Gigabit Ethernet SFP fiber uplink ports
• Management & Console Interfaces (serial console, auxiliary, USB options)

Memory & Storage

• Installed DRAM: 4 GB (expandable to 16 GB)
• Flash Memory: 4 GB (expandable to 16 GB)

Modular Expansion

• 3 × NIM (Network Interface Module) slots
• 2 × SM-X Service Module slots
• 1 × ISC (Integrated Services Card) slot
• Support for WAN, security, voice, and application modules

Software & Features

• Advanced routing protocols (BGP, OSPF, EIGRP, RIP, etc.)
• Security services (ACL, VPN, firewall, IPS)
• Quality of Service (QoS) and traffic management
• WAN optimisation and service convergence capabilities

Power & Physical

• Multiple internal power supply options (AC standard, optional DC or PoE power supply modules)
• Rack-mountable form factor (2-RU)
• Robust construction for enterprise deployments

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Key Highlights (Bullet Points)

• 🚀 Enterprise-Grade Routing Platform with Cisco IOS XE flexibility
• 🔌 3 Gigabit Ethernet + 3 Gigabit SFP Ports for versatile connectivity
• 🧠 Modular Design with NIM, SM-X, and ISC expansion slots
• 📊 Scalable Memory Options (4 GB installed, up to 16 GB)
• 🔐 Advanced Network Services including routing, security, VPN, and QoS
• 🛠 Designed for Branch & Enterprise Edge Networks
• 📈 High Throughput for WAN & LAN Traffic
• 📦 Supports Hybrid WAN, Voice, and Application Services