ISR4431-AX/K9 Cisco ISR 4431 AX Bundle w/APP, SEC license

Cisco ISR4431-AX/K9 - Overview

The ISR 4431 is a 1RU modular router in the ISR 4400 family, positioned above the ISR4351. It provides significantly more throughput and expansion, designed for WAN aggregation, SD-WAN, and hybrid cloud connectivity. The AX bundle ensures that enterprises get a full suite of application and security services pre-licensed.

🔧 Key Hardware Specifications

• Form Factor: 1RU rack-mountable router
• Performance:
  • 500 Mbps default throughput
  • Upgradeable to 1 Gbps or 2 Gbps with performance licenses
• Interfaces:
  • 3x RJ45/SFP combo Gigabit Ethernet WAN/LAN ports
  • 3x NIM (Network Interface Module) slots
  • 1x ISC (Internal Services Card) slot
• Memory/Storage:
  • 4 GB DRAM (upgradeable to 16 GB)
  • 8 GB flash (upgradeable to 16 GB)
• Software: Runs Cisco IOS XE (modular, Linux-based OS)
• Power: Dual redundant PSU options available

AX Bundle Features

The AX license package enables:

• Application Visibility and Control (AVC) - deep packet inspection and traffic analytics
• WAN Optimization - Cisco WAAS Express for branch acceleration
• Integrated Security - Zone-Based Firewall, VPN (IPsec, DMVPN, FlexVPN), Trustworthy Systems
• Performance Licensing - throughput upgrades beyond the base 500 Mbps
• Unified Communications Readiness - support for voice/video services if needed

🧩 Ideal Use Cases

• Large branch offices requiring high-performance WAN and SD-WAN connectivity
• Regional aggregation sites consolidating multiple branch connections
• Enterprises needing application-aware routing and WAN optimization
• Hybrid cloud deployments where throughput and application visibility are critical