United States$5,000,000+
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Richard Evans
4
AX bundle provided strong application and security performance. Stable under load.
ISR4351-AX/K9
Cisco ISR 4351 AX Bundle w/ APP.SEC lic
FEATURED DEAL
Name:
ISR4351-AX/K9
- Description:
- Cisco ISR 4351 AX Bundle w/ APP.SEC lic
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 659821191628
- Condition:
- Warranty:
- 3
- List Price:
$17,763.00
- Price:
$7,944.0055.3% off
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1
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ISR4351-AX/K9 Overview
ISR4351-AX/K9 is a high-performance enterprise router designed with a fixed architecture that supports versatile power options including AC and DC configurations with redundancy capabilities. It packs dual integrated WAN/LAN interfaces, integrated services for voice, video, and WAN optimization, and modular capabilities via dedicated NIM slots to expand its functionality.
ISR4351-AX/K9 delivers robust VPN features such as IPSec, SSL VPN, DMVPN, and FlexVPN, ensuring secure remote connectivity while achieving a throughput capacity of approximately 0.15 Gbps. Built for high availability and exceptional performance in enterprise use cases, it provides advanced firewall protection, comprehensive routing protocols, and remote management via SSH, Telnet, and SNMP.
ISR4351-AX/K9 price is $7,944.00, a 55.3% saving from the Cisco list price of $17,763.00. ISR4351-AX/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4351-AX/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4351-AX/K9 Specifications
- Product Type
- Enterprise Router
- VPN Support
- IPSec / SSL VPN / DMVPN / FlexVPN
- Power Source
- AC Power Supply / DC Power Supply / Redundant
- Routing Protocols
- OSPF / BGP / EIGRP / RIP / Static Routing
- Broadband
- N/A
- Architecture
- Fixed
- WAN Configuration
- WAN
- WAN Ports
- 2 WAN
- LAN Ports
- 4 LAN Ports
- Ethernet Technology
- 10/100/1000
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Network Protocols
- IPv4 / IPv6 / MPLS / VPN
- Remote Management
- SSH / Telnet / SNMP
- Compliance Standards
- FCC / CE / RoHS
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization
- Use Case
- Enterprise
- Management
- Managed
- Form Factor
- Rack-mount
- Integrated Services
- Voice / Video / WAN Optimization
- High Availability Support
- Supported
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- Throughput Capacity
- 0.15 Gbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall / Intrusion Prevention
- Expansion Slots
- NIM
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 1 GB
- Flash Memory
- 256 MB
- Interface Ports
- RJ-45
- Power
- 62 W
- Device Type
- Router
- Product Name
- Cisco ISR4351-AX/K9 Integrated Services Router
- Height
- 1.7 inches
- Width
- 17.3 inches
- Depth
- 16.9 inches
- Weight
- 19 lbs
ISR4351-AX/K9 Use Case
Secure SD-WAN Edge for Distributed Enterprises
A national retail chain deploys the Cisco ISR4351-AX/K9-Cisco ISR 4351 AX Bundle w/ APP.SEC lic at 250 branch locations to establish an encrypted SD-WAN fabric, centralize policy management, and optimize cloud application performance. Outcome: unified orchestration, 40% reduction in WAN costs, and real-time threat prevention across all sites.
Zero-Trust SASE Gateway for Financial Institutions
A mid-sized bank integrates the ISR 4351 AX Bundle w/ APP.SEC lic to enforce zero-trust access for remote employees and secure connections to SaaS-based trading platforms. Outcome: end-to-end application security, simplified compliance with PCI DSS, and a 50% decrease in incident response time.
High-Availability Hybrid WAN for Healthcare Data Centers
A regional healthcare provider leverages the Cisco ISR4351-AX/K9-Cisco ISR 4351 AX Bundle w/ APP.SEC lic as an edge router, pairing MPLS primary links with LTE backup and advanced intrusion prevention to protect patient records. Outcome: 99.99% uptime, HIPAA-compliant encryption, and seamless failover during network disruptions.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| ISR4351-AX/K9 |  ISR4221X/K9 |  C1-CISCO4321/K9 |  ISR4321-DNA |  ISR4351/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Modular | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE / RoHS | FCC / CE / RoHS | FCC / CE | FCC, CE | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired / Ethernet |
| Depth | 16.9 inches | N/A | 20 inches | 15 inches | 18.8 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | EN 55032 / EN 55024 | N/A | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM | EHWIC / NIM | NIM / EHWIC | EHWIC | EHWIC / NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization | VPN / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization | VPN / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 512 MB | 512 MB | 2 GB |
| Form Factor | Rack-mount | Desktop | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.7 inches | N/A | 1.75 inches | 1.75 inches | 1.73 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video | Voice / Video |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 / SFP | RJ-45 / SFP | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 1 GB | 4 GB | 1 GB | 4 GB | 4 GB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 3+ Slots | 3+ Slots |
| Network Protocols | IPv4 / IPv6 / MPLS / VPN | IPv4 / IPv6 | IPv4, IPv6 | IPv4, IPv6 | IPv4 / IPv6 |
| Power | 62 W | 65W | 110 W | 200 Watts | 60 Watt |
| Power Source | AC Power Supply / DC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant | AC Power Supply with Redundant Options | AC Power Supply | AC Power Supply / DC Power Supply / Redundant / N/A |
| Product Name | Cisco ISR4351-AX/K9 Integrated Services Router | Cisco ISR 4221 Integrated Services Router | Cisco 4321 Integrated Services Router (C1-CISCO4321/K9) | ISR4321-DNA | Cisco ISR 4351-K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | SSH / Telnet / SNMP | SSH / Telnet / SNMP | Cisco DNA Center, CLI, Web UI | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A |
| Safety | N/A | UL / cUL | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | ITU-T | N/A | N/A | N/A |
| Throughput Capacity | 0.15 Gbps | 300 Mbps | 0.15 Gbps | 0.3 Gbps | 75 Mbps |
| Use Case | Enterprise | Business | Enterprise | Enterprise / Business | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A |
| WAN Configuration | WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 19 lbs | N/A | 14 lbs | 11 lbs | 15 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.3 inches | N/A | 17.5 inches | 17 inches | 17.3 inches |
| Wireless Support | No | No | No | No | No |
Reviews & Ratings
P
Paul Jennings
5
Good throughput and feature set for modern branch networks.
S
Simon Carter
4
Cisco ISR reliability with advanced services enabled.
O
Oliver Matthews
4
Handles WAN and security workloads smoothly.
D
Duncan Walsh
4
Well balanced router for application heavy environments.
Questions & Answers
What is the Cisco ISR 4351 AX Bundle with APP.SEC license (SKU: ISR4351-AX/K9)?
The Cisco ISR 4351 AX Bundle w/ APP.SEC lic provides an integrated services router with built-in Wi-Fi 6, advanced security, unified communications, and an Application Security (APP.SEC) license for comprehensive threat protection.
Which key features define the ISR 4351 AX Bundle?
Key features include up to 2 Gbps aggregate throughput, 802.11ax Wi-Fi 6, hardware-based encryption, modular LAN/WAN ports, embedded security with Snort IPS, and the APP.SEC license for advanced firewall, URL filtering, and malware defense.
What throughput can I expect from the Cisco ISR 4351 AX?
The ISR 4351 AX delivers up to 2 Gbps aggregate WAN-to-LAN throughput, up to 300 Mbps of encrypted VPN performance, and scales to support 50,000 concurrent sessions for high-performance enterprise WAN connectivity.
How does the APP.SEC license enhance the router’s security?
The APP.SEC license enables Cisco’s advanced security suite including next-gen IPS, URL filtering, malware scanning, and application visibility and control, ensuring multi-layered threat prevention and policy enforcement.
Is the ISR 4351 AX Bundle suitable for SD-WAN deployments?
Yes, the ISR 4351 AX supports Cisco SD-WAN with built-in vEdge capabilities, Zero-Touch Provisioning, and centralized management via vManage, optimizing WAN performance and security for distributed enterprises.
What integrated services are provided by the Cisco ISR 4351 AX?
Integrated services include routing, switching, security (VPN, firewall, IPS), unified communications, application acceleration, wireless controller, and WAN optimization delivered through IOS XE software.
Does the ISR 4351 AX Bundle support Wi-Fi 6 (802.11ax)?
Yes, it comes with an embedded 802.11ax wireless controller and access point for high-density, low-latency Wi-Fi 6 connectivity, ideal for enterprise and branch environments.
How many network interfaces are available on the ISR 4351 AX?
The platform includes three integrated Gigabit Ethernet WAN ports, eight integrated Gigabit Ethernet LAN ports, two NIM slots, and two SM slots for flexible modular expansion.
Which routing protocols are supported on the ISR 4351 AX?
Cisco ISR 4351 AX supports OSPF, EIGRP, BGP, IS-IS, RIP, and policy-based routing, enabling robust dynamic routing and failover capabilities in multi-vendor environments.
What are the ideal use cases for the Cisco ISR 4351 AX Bundle?
Ideal use cases include large branch offices, regional headquarters, retail aggregations, and mission-critical enterprises requiring high-throughput WAN connectivity, integrated security, and Wi-Fi 6 support.
What are the physical dimensions and power requirements?
The ISR 4351 AX measures 1.72 x 17.36 x 14.04 inches, weighs 12 lbs, and operates on AC power (100–240 VAC, 50/60 Hz) with a maximum power draw of 120 W.
How scalable is the Cisco ISR 4351 AX platform?
With modular NIM and SM slots, you can add interfaces for additional WAN, LAN, or WAN-optical ports, scale up to 100,000 sessions, and expand security and application services on demand.
How do I configure the APP.SEC license on my ISR 4351 AX?
After activating the feature key in Cisco Software Licensing, assign the APP.SEC license via the Command Line Interface using 'license install' and enable security services in the IOS XE security configuration.
What support and warranty options are available for ISR 4351 AX?
Cisco offers a limited lifetime warranty for the ISR 4351 AX hardware, plus optional SMARTnet services for 24/7 technical support, software updates, and advance hardware replacement.
How does the ISR 4351 AX improve network security posture?
By combining hardware-accelerated encryption, next-gen IPS, URL filtering, malware defense, and application visibility, it provides a unified threat management platform that mitigates advanced attacks at branch and HQ locations.
How can I obtain pricing and order the Cisco ISR 4351 AX Bundle?
Contact your authorized Cisco reseller or visit the Cisco Partner Locator online to request a quote, check current pricing, and initiate your purchase of the ISR 4351 AX Bundle with APP.SEC license.