The Cisco ISR4351-AX/K9 Integrated Services Router is a high-performance enterprise networking platform from the Cisco ISR 4000 Series, designed for secure branch connectivity, WAN edge deployments, application optimization, and scalable network services. Featuring the AX Bundle with Application Experience (AppX) and Security capabilities, the router combines advanced routing, application-aware networking, VPN connectivity, and security services in a single platform.
The ISR4351-AX/K9 delivers 200 Mbps of default aggregate throughput, upgradeable to 400 Mbps with appropriate performance licensing, providing scalable performance for growing enterprise network requirements. Its integrated Gigabit Ethernet RJ-45/SFP connectivity offers flexible WAN and LAN deployment options for branch offices and distributed business environments.
Powered by Cisco IOS XE, the router supports advanced enterprise networking technologies including BGP, OSPF, EIGRP, IS-IS, IPv4, IPv6, MPLS, NAT, QoS, and application-aware routing. The AX Bundle enhances network performance with application visibility, intelligent traffic management, and optimization capabilities while providing security features for protecting business-critical communications.
For secure connectivity, the Cisco ISR4351-AX/K9 supports IPsec VPN, DMVPN, site-to-site VPN connectivity, encryption, access control lists, and firewall capabilities. These features make it suitable for organizations requiring secure communications between headquarters, branch offices, data centers, and remote locations.
The router's highly modular architecture provides 3 Network Interface Module (NIM) slots, 2 SM-X service module slots, and 1 Integrated Services Card (ISC) slot, allowing organizations to expand network connectivity and services as business requirements evolve. It also supports migration to Cisco SD-WAN with compatible software and licensing.
Ideal for enterprise branch networking, secure WAN connectivity, VPN gateway deployments, application optimization, SD-WAN migration, and remote office connectivity, the Cisco ISR4351-AX/K9 Integrated Services Router with AX Bundle delivers enterprise-grade performance, advanced security, and scalable application-aware networking for modern distributed organizations.
Product Specifications – Cisco ISR4351-AX/K9 4000 Series Integrated Services Router with AX Bundle
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| Specification |
Details |
| Product Name |
Cisco ISR4351-AX/K9 4000 Series Integrated Services Router with AX Bundle |
| Manufacturer |
Cisco Systems |
| Part Number |
ISR4351-AX/K9 |
| Product Series |
Cisco ISR 4000 Series |
| Product Type |
Integrated Services Router (ISR) |
| Bundle / License |
AX Bundle |
| AX Bundle Capabilities |
Application Experience (AppX) and Security Features |
| Aggregate Throughput |
200 Mbps Default |
| Performance Upgrade |
Up to 400 Mbps with Performance License |
| Boost Performance |
Higher performance may be available with compatible Boost licensing and software |
| Integrated WAN/LAN Ports |
3 × Gigabit Ethernet |
| RJ-45 Connectivity |
3 × Gigabit Ethernet RJ-45 |
| SFP Connectivity |
3 × Gigabit Ethernet SFP |
| Interface Design |
RJ-45 / SFP Combination Gigabit Ethernet Interfaces |
| 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 |
| Architecture |
Multicore Cisco ISR 4000 Series Architecture |
| Application Experience Services |
Application Visibility, Control and Optimization |
| Application-Aware Routing |
Supported |
| WAN Optimization |
Supported through compatible AppX features |
| VPN Support |
IPsec VPN, DMVPN and Secure Site-to-Site Connectivity |
| Security Features |
Firewall, VPN, Encryption, ACLs and Threat Protection Capabilities |
| Encryption Support |
AES and IPsec Encryption |
| Routing Protocols |
BGP, OSPF, EIGRP, IS-IS, RIP and Static Routing |
| IPv4 Support |
Yes |
| IPv6 Support |
Yes |
| MPLS Support |
Supported, software and license dependent |
| Quality of Service (QoS) |
Advanced QoS, Traffic Classification and Prioritization |
| NAT Support |
Yes |
| VLAN Support |
Yes |
| High Availability |
Platform and Deployment Dependent |
| SD-WAN Migration |
Supports migration to Cisco SD-WAN with compatible software and licensing |
| Programmability |
Cisco IOS XE APIs and Automation Capabilities |
| Management |
CLI, SNMP and Cisco Network Management Platforms |
| Default Memory |
4 GB DRAM |
| Memory Expansion |
Expandable |
| Default Flash Memory |
4 GB |
| Flash Expansion |
Expandable |
| Modular Expansion |
Supported through NIM, SM-X and ISC Slots |
| Power Supply |
Internal AC Power Supply |
| Redundant Power Support |
Platform Configuration Dependent |
| Form Factor |
2U Rack-Mountable |
| Deployment Type |
Enterprise Branch, WAN Edge and Remote Office |
| Application |
Secure WAN, VPN, Application Optimization and Branch Networking |
| Region Variant |
Global |
| Reliability |
Enterprise-Grade |
| Condition |
Refurbished |
| Use Cases |
Enterprise Branch Networking, Secure WAN Connectivity, VPN Gateway, Application Optimization, SD-WAN Migration, Remote Office Connectivity |
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FAQs
Q1. What does the AX Bundle include?
The AX Bundle includes Application Experience (APP) and Security licenses, providing WAN optimization, advanced routing, VPN, and security capabilities.
Q2. How many onboard network interfaces does the ISR4351-AX/K9 provide?
It includes three Gigabit Ethernet RJ-45 ports and three Gigabit Ethernet SFP ports for flexible WAN and LAN connectivity.
Q3. Does this router support VPN connectivity?
Yes. It supports secure IPsec VPN and advanced security features through Cisco IOS XE and the AX Bundle.
Q4. Can additional network modules be installed?
Yes. The router supports Network Interface Modules (NIMs) and Service Modules, allowing flexible expansion as business needs grow.
Q5. Is the ISR4351-AX/K9 suitable for enterprise branch offices?
Yes. It is designed for medium and large enterprise branch offices requiring secure WAN access, application optimization, and scalable network services
