The Cisco ISR4351-SEC/K9 Integrated Services Router is a high-performance enterprise networking platform designed for secure branch connectivity, WAN edge deployments, VPN services, and remote office networking. Part of the Cisco 4000 Series Integrated Services Routers, it includes the Cisco Security Bundle (SEC) to provide advanced security capabilities for protecting business-critical voice, video, data, and application traffic.
Featuring 3 integrated Gigabit Ethernet interfaces with flexible RJ-45 and SFP connectivity, the Cisco ISR4351-SEC/K9 provides reliable LAN and WAN connectivity for distributed enterprise environments. The router delivers 200 Mbps of default aggregate throughput, upgradeable to 400 Mbps with the appropriate performance license, enabling organizations to scale network performance as requirements grow.
The included Security Bundle supports advanced capabilities such as Cisco IOS XE Zone-Based Firewall, IPsec VPN, DMVPN, access control lists, and encrypted communications. These features help secure site-to-site connections, branch networks, remote offices, and business-critical WAN traffic.
Powered by Cisco IOS XE, the ISR4351-SEC/K9 supports advanced enterprise networking technologies including IPv4, IPv6, BGP, OSPF, EIGRP, IS-IS, NAT, VLANs, multicast, and Quality of Service (QoS). Application visibility, programmability, and automation capabilities further simplify network operations and improve traffic management.
The router's modular architecture includes 3 Network Interface Module (NIM) slots, 2 SM-X service module slots, and 1 Integrated Services Card (ISC) slot, providing flexible expansion for additional network interfaces and services. With compatible modules, software, and licensing, the platform can also support voice, video, unified communications, and Cisco SD-WAN migration.
Housed in a 2U rack-mountable form factor, the Cisco ISR4351-SEC/K9 4351 Integrated Services Router with Security Bundle combines scalable routing, advanced VPN connectivity, enterprise-grade security, and modular expansion in a reliable branch networking platform.
Ideal for enterprise branch networking, secure WAN connectivity, VPN gateway deployments, remote office networking, unified communications, and business network security, the Cisco ISR4351-SEC/K9 delivers scalable performance and secure connectivity for modern distributed enterprises.
Product Specifications - Cisco ISR4351-SEC/K9 4000 Series Integrated Services Router with Security Bundle
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| Specification |
Details |
| Product Name |
Cisco ISR4351-SEC/K9 4351 Integrated Services Router with Security Bundle |
| Manufacturer |
Cisco Systems |
| Part Number |
ISR4351-SEC/K9 |
| Base Router Model |
Cisco ISR 4351 |
| Product Series |
Cisco 4000 Series Integrated Services Routers |
| Product Type |
Integrated Services Router (ISR) |
| Bundle / License |
Security Bundle (SEC) |
| Primary Function |
Secure Enterprise Branch Routing and WAN Connectivity |
| Integrated Ethernet Interfaces |
3 × Gigabit Ethernet |
| Interface Type |
RJ-45 / SFP Combination Interfaces |
| WAN/LAN Connectivity |
3 Integrated Gigabit Ethernet Ports |
| Default Aggregate Throughput |
200 Mbps |
| Performance Upgrade |
Up to 400 Mbps with Appropriate Performance License |
| Performance Architecture |
Multicore CPU Architecture with Separate Control and Data Planes |
| Modular Architecture |
Yes |
| Network Interface Module Slots |
3 × NIM Slots |
| Enhanced Service Module Slots |
2 × SM-X Slots |
| Integrated Services Card Slot |
1 × ISC Slot |
| Operating System |
Cisco IOS XE |
| Layer Support |
Layer 2 and Layer 3 Services |
| IPv4 Support |
Yes |
| IPv6 Support |
Yes |
| Static Routing |
Supported |
| Dynamic Routing |
Supported |
| Routing Protocols |
BGP, OSPF, EIGRP, IS-IS, RIP and Other Supported Cisco IOS XE Protocols |
| MPLS Support |
Software and License Dependent |
| Multicast Support |
Supported |
| VLAN Support |
Yes |
| NAT Support |
Yes |
| Quality of Service (QoS) |
Advanced QoS, Traffic Classification and Prioritization |
| Security Package |
Cisco Security Technology Package |
| Firewall Support |
Cisco IOS XE Zone-Based Firewall |
| VPN Support |
IPsec VPN, Site-to-Site VPN and Remote Access Capabilities |
| DMVPN Support |
Supported |
| Encryption |
AES and Other Supported Cryptographic Technologies |
| Secure Connectivity |
Encrypted WAN and VPN Communications |
| Access Control |
Access Control Lists (ACLs) |
| Application Awareness |
Cisco IOS XE Application Visibility and Control Capabilities |
| Unified Communications |
Supported with Compatible Modules, Software and Licensing |
| Voice Services |
Supported with Compatible DSP and Voice Modules |
| Application Services |
Routing, Security, Voice, Video and Data Services |
| SD-WAN Migration |
Supported with Compatible Cisco Software and Licensing |
| Programmability |
Cisco IOS XE APIs and Automation Capabilities |
| Management |
CLI, SNMP and Supported Cisco Network Management Platforms |
| Default DRAM |
4 GB |
| Memory Expansion |
Expandable |
| Default Flash Memory |
4 GB |
| Flash Expansion |
Expandable |
| Power Supply |
Internal AC Power Supply |
| Power Redundancy |
Supported with Compatible Redundant Power Supply Configuration |
| High Availability |
Platform and Deployment Dependent |
| Form Factor |
2U Rack-Mountable |
| Rack Space |
2 Rack Units (2RU) |
| Deployment Type |
Enterprise Branch, WAN Edge and Remote Office |
| Application |
Secure Routing, VPN, WAN Connectivity and Unified Communications |
| Reliability |
Enterprise-Grade |
| Condition |
Refurbished |
| Use Cases |
Enterprise Branch Networking, Secure WAN Connectivity, VPN Gateway Deployment, Remote Office Networking, Unified Communications, Business Network Security |
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FAQs
Q1. What is included with the ISR4351-SEC/K9 Security Bundle?
The router includes the Cisco Security Bundle, providing advanced firewall capabilities, VPN services, and encryption for secure enterprise networking.
Q2. How many onboard Gigabit Ethernet ports does the router have?
The ISR4351 includes three integrated Gigabit Ethernet ports for flexible WAN and LAN connectivity.
Q3. Does this router support modular expansion?
Yes. It supports Network Interface Modules (NIMs), Service Modules, and additional expansion options to meet changing business requirements.
Q4. Does the ISR4351-SEC/K9 support VPN connectivity?
Yes. It supports secure IPsec VPN and other advanced security features through Cisco IOS XE and the Security Bundle.
Q5. What environments is this router best suited for?
It is ideal for enterprise branch offices, secure WAN edge deployments, unified communications, and organizations requiring scalable and reliable network security.
