ISR4331-AX/K9
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Cisco ISR4321-AX/K9 Integrated Services Router

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ISR4321-AX/K9 Overview

ISR4321-AX/K9 intelligent WAN bundle combines security features, application experience and Wide Area Application Services (WAAS) features together into one platform. The intelligent WAN bundle optimizes network traffic across the “best” link based on applications and monitors network conditions to deliver the best performance as possible. In this platform, you get tight control over application performance, bandwidth usage, data privacy, and availability of your WAN links – control that you need as your branches conduct greater volumes of mission-critical business.

ISR4321-AX/K9 comes with IP base image, Security, AppX licensing for 200 TCP connection resources for ISR WAAS optimization and 4-GB DRAM, 4GB Flash memory, 50Mbps WAN bandwidth by default, to enable the ISR WAAS service, update memory, flash memory and hard drive is required, vWAAS service is not available on this platform.

Quick Specs

Product Code

ISR4321-AX/K9
Aggregate Throughput 50 Mbps to 100 Mbps
Total onboard WAN or LAN 10/100/1000 ports 2
RJ-45-based ports 2
SFP-based ports 1
NIM (Network Interface Modules) slots 2
Onboard ISC slot 1
Memory 4 GB (default) / 8 GB (maximum)
Flash Memory 4 GB (default) / 8 GB (maximum)
Power-supply options External: AC and PoE
Rack height 1 RU
Dimensions (H x W x D) 44.55 x 369.57 x 294.64 mm
Package Weight 9.19 Kg
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Description 50Mbps-100Mbps system throughtput, 2 WAN/LAN ports, 1 SFP port, multi-Core CPU,2 NIM, Security, Voice, WAAS, Intelligent WAN, OnePK, AVC
Aggregate Throughput 50 Mbps to 100 Mbps
Total onboard WAN or LAN 10/100/1000 ports 2
RJ-45-based ports 2
SFP-based ports 1
Enhanced service-module slots 0
Doublewide service-module slots 0
NIM slots 2
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) 8 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 8 GB
External USB 2.0 slots (type A) 1
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 External: AC and PoE
Redundant power supply N/A
AC input voltage -
AC input voltage 100 to 240 VAC Autoranging
AC input frequency 47 to 63 Hz
AC input current range, AC power supply (maximum) 1.5 to 0.6A
AC input surge current 90 A peak and less than 3 Arms per half cycle
Typical power (no modules) (watts) 36
Maximum power with AC power supply (watts) 125
Maximum power with PoE power supply (platform only) (watts) 260
Maximum endpoint PoE power available from PoE power supply (watts) 120

Frequently Asked Questions

What is Cisco ISR4321-AX/K9?

The ISR4321-AX/K9 is a Cisco 4000 Series Integrated Services Router that includes the AX (Application Experience) bundle. It combines enterprise WAN routing with advanced application visibility, security, and branch network services, making it a popular router for small to mid-size branch offices.

What does “AX” mean in ISR4321-AX/K9?

“AX” stands for Application Experience. This bundle adds advanced application features such as application optimization, visibility, and security services beyond the base ISR4321 hardware. Many buyers search this because AX licensing is commonly compared with SEC, V, and base ISR versions.

What is ISR4321-AX/K9 mainly used for?

The ISR4321-AX/K9 is commonly deployed for: Enterprise branch WAN routing Application-aware networking Secure VPN connectivity Intelligent WAN (IWAN) deployments Small business branch connectivity It is designed to give tighter control over bandwidth, WAN reliability, and application performance.

What is the throughput of Cisco ISR4321-AX/K9?

The ISR4321-AX/K9 supports 50 Mbps to 100 Mbps aggregate throughput, depending on licensing and configuration. This makes it suitable for small to medium branch environments handling business-critical traffic.

What ports and interfaces are available on ISR4321-AX/K9?

Typical hardware includes: 2 × Gigabit Ethernet RJ-45 ports 1 × SFP port 2 × NIM expansion slots 1 × onboard ISC slot USB & console management ports This modular design allows flexible WAN and service expansion.

Does ISR4321-AX/K9 support SD-WAN?

Yes. The ISR4321 platform can run Cisco IOS XE and is commonly used in SD-WAN deployments, allowing centralized policy control, intelligent path selection, and better application performance across branch networks.

What is the difference between ISR4321-AX/K9 and ISR4321/K9?

Key difference: ISR4321/K9 → Base routing platform ISR4321-AX/K9 → Includes Application Experience bundle with enhanced app and security capabilities The AX version is preferred when application visibility and optimization are required.

Is ISR4321-AX/K9 suitable for cloud and hybrid networking?

Yes. It supports secure WAN connectivity and intelligent traffic management, allowing branch offices to connect securely to cloud platforms and hybrid data center environments while maintaining application performance.

Why is ISR4321-AX/K9 still highly searched online?

Search demand remains strong because: Large installed enterprise base AX bundle includes multiple licenses (APP + SEC features) Reliable branch performance SD-WAN migration compatibility Many organizations still maintain or expand ISR 4000 branch deployments. Key difference: ISR4321/K9 → Base routing platform ISR4321-AX/K9 → Includes Application Experience bundle with enhanced app and security capabilities The AX version is preferred when application visibility and optimization are required.

Is ISR4321-AX/K9 still supported by Cisco?

The ISR4321 family lifecycle status: End-of-Sale: 7 Nov 2023 End-of-Support: 30 Nov 2028 This is one of the most searched questions by enterprises planning upgrades or refresh cycles.

Does ISR4321-AX/K9 support SD-WAN?

Yes. The ISR4321 platform can run Cisco IOS XE and is commonly used in SD-WAN deployments, allowing centralized policy control, intelligent path selection, and better application performance across branch networks.

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