Cisco ISR4351/K9 Router – High-Performance Enterprise Edge

What It Is

The Cisco ISR4351/K9 is a modular enterprise router from the Cisco 4000 Series Integrated Services Routers (ISR). It is designed for mid-sized to large branch offices and enterprise edge deployments, offering integrated routing, security, and application services in a single platform. This model supports high-density WAN connectivity and advanced processing capabilities for concurrent services.

Technical Details

• Form Factor: 2U rack-mountable modular router
• Ethernet Ports: 3x Gigabit Ethernet (GE) interfaces
• Network Interface Module Slots: 3x NIM (Network Interface Module) slots for WAN/LAN expansion
• Service Module Slots: 2x SM (Service Module) slots for optional services (e.g., voice, security)
• Flash Memory: 4 GB onboard flash storage
• DRAM: 4 GB default memory (expandable)
• Software License: IPB (IP Base) feature set included

Configuration & Options

• Part Number: ISR4351/K9 (base model with IP Base license)
• Chassis includes: 3x GE ports, 3x NIM slots, 2x SM slots, 4 GB flash, 4 GB DRAM
• Expansion: NIM modules available for additional Ethernet, T1/E1, xDSL, or serial interfaces
• Service Modules: Optional SM slots support hardware acceleration for security or voice services
• Memory/Storage: DRAM and flash can be upgraded via field-replaceable modules

Operating Conditions

This router is intended for deployment in enterprise wiring closets or server rooms with controlled temperature and humidity. It supports concurrent routing, security, and WAN optimization services without dedicated external appliances. The modular architecture allows adaptation to changing branch or campus network requirements without replacing the chassis.