The Cisco ISR4351-VSEC/K9 Integrated Services Router is a powerful enterprise networking platform from the Cisco 4000 Series ISR, designed to deliver secure WAN connectivity, unified communications, and advanced security services in a single integrated solution. Optimized for enterprise branch and WAN edge deployments, it combines scalable routing performance with voice and threat protection capabilities for modern business environments.
Bundled with both Voice and Security licenses, the ISR4351-VSEC/K9 supports integrated VPN, firewall, encryption, and unified communications services, making it ideal for organizations requiring secure and converged voice, video, and data networking. It also supports DSP modules and Cisco Unified Border Element (CUBE) functionality for advanced VoIP and SIP trunking deployments.
The router provides scalable throughput from 200 Mbps up to 400 Mbps, ensuring reliable performance for demanding enterprise applications and high-bandwidth traffic. It features 3 Gigabit Ethernet RJ45/SFP combo ports, along with NIM and SM-X expansion slots, enabling flexible network customization and future scalability.
Powered by Cisco IOS XE, the ISR4351-VSEC/K9 supports advanced routing and security features including IPsec and SSL VPN, Zone-Based Firewall (ZBFW), AES encryption, QoS, and application optimization. Support for protocols such as BGP, OSPF, EIGRP, and IS-IS ensures seamless integration into enterprise and service provider networks.
Designed for high reliability and operational efficiency, the router supports modular expansion, centralized management, and automation capabilities, making it suitable for growing distributed environments.
Ideal for enterprise branch networking, secure WAN deployments, unified communications, and scalable business infrastructure, the Cisco ISR4351-VSEC/K9 provides a secure, flexible, and high-performance solution for modern enterprise connectivity.
Product Specifications – Cisco ISR4351-VSEC/K9 4000 Series Integrated Services Router
| Specification |
Details |
| Product Name |
Cisco ISR4351-VSEC/K9 Integrated Services Router |
| Manufacturer |
Cisco Systems |
| Part Number |
ISR4351-VSEC/K9 |
| Product Series |
Cisco 4000 Series ISR |
| Product Type |
Integrated Services Router |
| Bundle Included |
Voice + Security Bundle (UC & SEC License, PVDM, CUBE support) |
| Throughput |
200 Mbps to 400 Mbps (license scalable) |
| Interfaces |
3 × Gigabit Ethernet (RJ-45/SFP combo) |
| WAN/LAN Ports |
Configurable GE interfaces |
| NIM Slots |
2 × Network Interface Module (NIM) slots |
| Service Module Slot |
1 × SM-X slot |
| ISC Slot |
1 × Internal Services Card slot |
| Memory |
4 GB DRAM (default), expandable |
| Flash Memory |
4 GB flash (default), expandable |
| USB Ports |
2 × USB 3.0 |
| Console Ports |
RJ-45 and Mini-USB console |
| VPN Support |
Yes (IPsec, SSL VPN) |
| Security Features |
Firewall, encryption, threat protection |
| Firewall |
Zone-Based Firewall (ZBFW) |
| Encryption |
AES, 3DES |
| Voice Support |
DSP modules, unified communications |
| Voice Features |
SIP trunking, VoIP, CUBE support |
| Routing Protocols |
OSPF, EIGRP, BGP, IS-IS |
| QoS Support |
Advanced QoS and traffic prioritization |
| WAN Optimization |
Application optimization support |
| Operating System |
Cisco IOS XE |
| Management |
CLI, Web UI, SNMP, NETCONF/YANG |
| Automation Support |
API-based programmability |
| PoE Support |
Supported |
| Power Supply |
Internal AC power supply |
| Redundancy |
Optional redundant power support |
| Cooling |
Internal fan system |
| Form Factor |
1 Rack Unit (1RU), rack-mountable |
| Deployment Type |
Enterprise branch and WAN edge |
| Application |
Unified communications, secure routing |
| Scalability |
Modular expansion with NIM and SM-X slots |
| Reliability |
Enterprise-grade continuous operation |
| Condition |
New / Cisco Certified |
| Use Cases |
Branch networking, VPN, voice/video services, WAN optimization |
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FAQs
Q1. What does VSEC stand for in this model?
It indicates the router includes both Voice (UC) and Security licenses.
Q2. Does this router support voice services?
Yes, it supports voice features through DSP modules and CUBE functionality.
Q3. What is the throughput capacity?
It supports scalable throughput, typically up to 400 Mbps depending on licensing.
Q4. Is this suitable for enterprise deployments?
Yes, it is designed for enterprise branch and WAN edge environments.
Q5. Can this router be expanded?
Yes, it includes NIM and service module slots for additional interfaces and services.
