ISR4321-AX/K9 Cisco ISR 4321 AX Bundle w/APP, SEC license

Cisco ISR4321-AX/K9 - Overview

The ISR 4321 is part of the Cisco 4000 Series Integrated Services Routers, designed for small to medium branch deployments. The AX bundle adds a comprehensive software feature set for enterprises that need more than just basic routing.

🔧 Key Hardware Specs

• Form Factor: 1RU rack-mountable router
• Performance:
  • 50 Mbps default throughput, software-upgradeable to 100 Mbps
• Interfaces:
  • 1x RJ45/SFP combo Gigabit Ethernet WAN/LAN ports
  • 1x RJ45 Gigabit Ethernet LAN port
  • 2x NIM (Network Interface Module) slots
  • 1x ISC (Internal Services Card) slot
• Memory/Storage:
  • 4 GB DRAM (upgradeable to 8 GB)
  • 4 GB flash (upgradeable to 8 GB)
• Power: AC PSU (redundant PSU not supported on this model)
• Software: Runs Cisco IOS XE

AX Bundle Features

The AX license package adds advanced services on top of the base router:

• Application Visibility and Control (AVC) - deep packet inspection and traffic analytics
• WAN Optimization - Cisco WAAS Express for branch acceleration
• Security - Zone-Based Firewall, VPN (IPsec, DMVPN, FlexVPN), Trustworthy Systems
• Performance Licensing - allows throughput upgrades beyond the default 50 Mbps
• Unified Communications Readiness - support for voice/video services

🧩 Ideal Use Cases

• Branch offices needing secure WAN and SD-WAN connectivity
• Enterprises requiring application-aware routing and traffic optimization
• Retail or distributed sites with lean IT staff but high performance needs
• Migration path from ISR G2 routers (e.g., 2900/3900 series)