ISR4331-SEC/K9 Cisco ISR 4331 Security Bundle w/SEC license

Cisco ISR4331-SEC/K9 - Overview

The ISR 4331 is a mid-tier model in the ISR 4000 family, designed for medium branch offices that need higher throughput and modular expansion compared to the ISR4321. The SEC bundle ensures that security services are enabled from day one, without requiring separate license purchases.

🔧 Key Hardware Specifications

• Form Factor: 1RU rack-mountable router
• Performance:
  • 100 Mbps default throughput
  • Upgradeable to 300 Mbps with performance license
• Interfaces:
  • 2x RJ45/SFP combo Gigabit Ethernet WAN/LAN ports
  • 2x NIM (Network Interface Module) slots
  • 1x SM (Service Module) slot
  • 1x ISC (Internal Services Card) slot
• Memory/Storage:
  • 4 GB DRAM (upgradeable to 16 GB)
  • 4 GB flash (upgradeable to 16 GB)
• Software: Runs Cisco IOS XE

SEC Bundle Features

The SEC license package enables:

• Zone-Based Firewall (ZBFW) - Stateful firewall with deep packet inspection
• VPN Services - IPsec, DMVPN, FlexVPN, SSL VPN
• Trustworthy Systems - Secure boot, image signing, runtime defenses
• Advanced Encryption - Strong cryptographic algorithms for compliance
• Integrated Security Monitoring - Syslog, SNMPv3, and NetFlow for visibility

🧩 Ideal Use Cases

• Medium branch offices needing secure WAN connectivity
• Enterprises deploying SD-WAN with built-in security
• Retail or distributed sites requiring VPN and firewall services
• Organizations consolidating routing and security into a single ISR platform