ISR4331-AX/K9
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Cisco ISR4351-AX/K9 Integrated Services Router

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ISR4351-AX/K9 Overview

Cisco 4351 Integrated Services Router, which supports 3 Network Interface Modules (NIM) slots, delivers 200 Mbps to 400 Mbps aggregate throughput.

ISR4351-AX/K9 is the Cisco ISR 4351 router with AX Bundle w/ APP.SEC license.

Quick Specs

Product Code

ISR4351-AX/K9
Aggregate Throughput 200 Mbps to 400 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 3
SFP-based ports 3
Enhanced service-module (SM-X) slot 2
NIM (Network Interface Modules) slots 3
Onboard ISC slot 1
Memory 4 GB (default) / 16 GB (maximum)
Flash Memory 4 GB (default) / 16 GB (maximum)
Power-supply options Internal: AC, DC (roadmap), and PoE
Rack height 2 RU
Dimensions (H x W x D) 43.9 x 438.15 x 507.2 mm
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Description Cisco ISR 4351 AX Bundle w/ APP.SEC lic
Aggregate Throughput 200 Mbps to 400 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 3
SFP-based ports 3
Enhanced service-module slots 2
Doublewide service-module slots 1 (assumes no singlewide SM-X modules installed)
NIM slots 3
OIR (all I/O modules) Yes
Onboard ISC slot 1
Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) 4 GB
Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) 16 GB
Default memory DDR3 ECC DRAM (data plane) NA
Maximum memory DDR3 ECC DRAM (data plane) NA
Default memory DDR3 ECC DRAM (control/services plane) NA
Maximum memory DDR3 ECC DRAM (control/services plane) NA
Default flash memory 4 GB
Maximum flash memory 16 GB
External USB 2.0 slots (type A) 2
USB console port -type B mini (up to 115.2 kbps) 1
Serial console port - RJ45 (up to 115.2 kbps) 1
Serial auxiliary port - RJ45 (up to 115.2 kbps) 1
Power-supply options Internal: AC, DC, and PoE
Redundant power supply N/A
AC input voltage 100 to 240 VAC autoranging
AC input frequency 47 to 63 Hz
AC input current range, AC power supply (maximum) 7.1 to 3.0A
AC input surge current 60 A peak and less than 12 Arms per half cycle
Typical power (no modules) (watts) 48
Maximum power with AC power supply (watts) 430
Maximum power with PoE power supply (platform only) (watts) 990
Maximum endpoint PoE power available from PoE power supply (watts) 500

Frequently Asked Questions

What is Cisco ISR4351-AX/K9?

The ISR4351-AX/K9 is an enterprise-class integrated services router from Cisco’s 4000 Series. It includes the AX Bundle with APP.SEC licensing is designed for secure branch networking, application awareness, and advanced WAN services in enterprise environments.

What does “AX” mean in ISR4351-AX/K9?

AX” refers to the Application Experience (APPX/APP.SEC) licensing bundle. It enables advanced features such as: Application visibility & control WAN optimization Enhanced security capabilities Improved performance for business apps This is one of the most commonly searched differentiators by enterprise buyers.

What throughput does ISR4351-AX/K9 support?

The ISR4351-AX/K9 delivers 200 Mbps to 400 Mbps aggregate throughput, making it suitable for medium-size enterprise branches handling voice, video, cloud, and secure data applications.

What ports and expansion options are available?

Key hardware specifications include: 3 × Gigabit WAN/LAN ports 3 × SFP-based ports 3 × NIM (Network Interface Module) slots 2 × SM-X service module slots Modular expansion for voice or WAN modules This flexibility makes it highly scalable for growing businesses.

Does ISR4351-AX/K9 support SD-WAN?

Yes. The router supports Cisco Catalyst SD-WAN, enabling centralized management, policy automation, and application-aware routing across distributed enterprise branches.

Is ISR4351-AX/K9 secure for enterprise networks?

Yes. Security features available with the APP SEC licensing include: Encrypted VPN connectivity Application-level visibility Secure WAN routing Integrated threat-protection capabilities These features make it suitable for organizations requiring secure WAN infrastructure.

Is ISR4351-AX/K9 good for branch offices?

Yes. This router is specifically designed for enterprise branch deployments, offering: Secure WAN connectivity Application optimization Modular expansion Centralized SD-WAN capability Cisco positions the ISR 4000 Series as a complete branch networking solution.

Is ISR4351-AX/K9 still supported by Cisco?

The ISR4351 platform is now End-of-Sale, but hardware support continues until 30 November 2028, making it still widely used in existing enterprise networks.

What is the replacement for ISR4351-AX/K9?

Cisco recommends newer Catalyst 8000 Series routers for modern deployments, which provide: Enhanced SD-WAN integration Better cloud performance Longer lifecycle support Higher throughput scalability

What industries commonly use ISR4351-AX/K9?

This router is widely deployed across industries that require secure branch networking and application control, including: Banking & Financial Services Healthcare & Hospitals Enterprise Corporate Offices Retail Chains & Multi-Branch Businesses Manufacturing & Logistics Education Institutions Government & Public Sector These industries rely on centralized WAN control with high security.

Is ISR4351-AX/K9 suitable for cloud applications?

Yes. With application visibility and WAN optimization, it helps enterprises run: Microsoft 365 Cloud collaboration apps Video conferencing SaaS business platforms while maintaining stable performance over WAN links.

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