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

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ISR4331-AX/K9 Overview

Cisco 4331 Integrated Services Router delivers 100 Mbps to 300 Mbps aggregate throughput and offers one Enhanced service-module (SM-X) slot, which supports for both single- and double-wide service module provides flexibility in deployment options. Cisco

ISR4331-AX/K9 provides Advanced Service Bundle.

Product Code Cisco

ISR4331-AX/K9
Bundle Advanced Service Bundle
Aggregate Throughput 100 Mbps to 300 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 2
SFP-based ports 2
Enhanced service-module (SM-X) slot 1
NIM (Network Interface Modules) slots 2
Onboard ISC slot 1
Memory 4 GB (default) / 16 GB (maximum)
Flash Memory 4 GB (default) / 16 GB (maximum)
Power-supply options Internal: AC and PoE
Rack height 1 RU
Dimensions (H x W x D) 44.45 x 438.15 x 438.15 mm
Package Weight 12.96 Kg
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Aggregate Throughput

100 Mbps to 300 Mbps

Total onboard WAN or LAN 10/100/1000 ports

3

RJ-45-based ports

2

SFP-based ports

2

Enhanced service-module slots

1

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)

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)

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

Internal: 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)

3 to 1.3A

AC input surge current

60 A peak and less than 5 Arms per half cycle

Typical power (no modules) (watts)

42

Maximum power with AC power supply (watts)

250

Maximum power with PoE power supply (platform only) (watts)

530

Maximum endpoint PoE power available from PoE power supply (watts)

250

Frequently Asked Questions

What is the Cisco ISR4331-AX/K9?

The Cisco ISR4331-AX/K9 is a mid-range Integrated Services Router from Cisco's ISR 4000 Series, bundled with the AppX License (AX/K9). It is purpose-built for small to medium-sized enterprise branch offices requiring a balance of performance, security, application visibility, and WAN optimization in a single, compact platform.

What does "AX/K9" mean in Cisco ISR4331-AX/K9?

AX stands for AppX (Application Experience) Bundle, which is the highest-tier license available for the ISR 4331. It includes: All features of the IP Base License All features of the Security Bundle (SEC/K9) Cisco Application Visibility and Control (AVC) Cisco Wide Area Application Services (WAAS) Cisco AppNav for WAN optimization Cisco Performance Monitor NFV (Network Functions Virtualization) support K9 confirms the router supports strong cryptographic encryption, including AES-256, IPsec, and SSL/TLS protocols.

What VPN technologies does the ISR4331-AX/K9 support?

The ISR4331-AX/K9 supports a comprehensive and enterprise-grade VPN portfolio including IPsec Site-to-Site VPN, DMVPN (Dynamic Multipoint VPN), FlexVPN, GET VPN (Group Encrypted Transport VPN), SSL VPN via Cisco AnyConnect, MPLS-based L3VPN, and SD-WAN overlay VPN tunnels. This makes it an ideal hub or spoke router in complex multi-branch enterprise topologies.

What is Cisco AVC and why is it important in the ISR4331-AX/K9?

Cisco Application Visibility and Control (AVC) is a suite of services that provides deep packet inspection (DPI), enabling the router to identify, monitor, and control over 1,400 applications traversing the network — including cloud apps like Microsoft 365, Salesforce, Zoom, and AWS.

Does the ISR4331-AX/K9 support Cisco SD-WAN?

Yes. The ISR4331-AX/K9 is fully compatible with Cisco IOS XE SD-WAN (formerly Viptela). By upgrading to SD-WAN software, enterprises can enable: Zero Touch Provisioning (ZTP) for rapid branch deployment Application-aware routing with SLA-based path selection Centralized policy management via Cisco vManage Cloud OnRamp for optimized SaaS/IaaS access Segmentation and micro-segmentation across WAN This future-proofs the ISR4331-AX/K9 investment for organizations modernizing their WAN infrastructure.

What is WAAS and how does it benefit ISR4331-AX/K9 users?

Cisco Wide Area Application Services (WAAS) is a WAN optimization technology included in the AX bundle that dramatically improves application performance across the WAN by using: Data Redundancy Elimination (DRE) – reduces repetitive data transfer LZ Compression – compresses data in transit TCP Flow Optimization – improves slow-start behavior over high-latency links Application Acceleration – speeds up protocols like CIFS, NFS, HTTP, and MAPI (Exchange) For branch offices with limited bandwidth or high-latency WAN links, WAAS can deliver application performance improvements of 30–100x in real-world deployments.

What Network Interface Modules (NIMs) are compatible with ISR4331-AX/K9?

The ISR4331-AX/K9 supports a broad range of NIMs for flexible WAN and LAN expansion: NIM-2T / NIM-4T – T1/E1 Serial WAN connectivity NIM-1GE-CU-SFP – SFP-based Gigabit Ethernet uplink NIM-ES2-4 / NIM-ES2-8 – Layer 2/3 LAN switching NIM-4G-LTE / NIM-4G-LTE-LA – 4G LTE cellular WAN backup NIM-2BRI-NT/TE – ISDN BRI for legacy voice NIM-VAB-A – Analog voice module NIM-SSD – Solid-state drive for local storage and NFV workloads

How does the ISR4331-AX/K9 support Network Functions Virtualization (NFV)?

The ISR4331-AX/K9 supports Cisco's Integrated Services Virtual Router (ISRv) and the Cisco UCS E-Series Server Module, enabling organizations to run virtualized network functions (VNFs) directly on the router hardware. This includes: Virtual firewalls (Cisco ASAv) Virtual WAN optimizers SD-WAN vEdge software Third-party VNFs via the NFVIS (Network Functions Virtualization Infrastructure Software) platform This eliminates the need for dedicated appliances at branch offices, reducing CAPEX and rack space.

Is the Cisco ISR4331-AX/K9 suitable for high availability deployments?

Yes. The ISR4331-AX/K9 supports multiple high-availability features including Dual WAN link failover with IP SLA tracking, BFD (Bidirectional Forwarding Detection) for fast link failure detection, HSRP/VRRP for first-hop redundancy, optional redundant power supply, NSF/SSO (Non-Stop Forwarding/Stateful Switchover), and DMVPN hub redundancy. These features collectively ensure minimal downtime in mission-critical branch deployments.


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