ISR4331-SEC/K9
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Cisco ISR4431/K9 Integrated Services Router

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ISR4431/K9 Overview

Cisco 4431 Integrated Services Router, which supports 3 Network Interface Modules (NIM) slots, delivers 500 Mbps to 1 Gbps aggregate throughput. This router also supports two kinds of DDRM, data plane and control/services plane, which make administrator easy to manage the router.

Quick Specs

Table 1 shows the Quick Specs.

Product Code Cisco

ISR4431/K9
Aggregate Throughput 500 Mbps to 1 Gbps
Total onboard WAN or LAN 10/100/1000 ports 4
RJ-45-based ports 4
SFP-based ports 4
Enhanced service-module (SM-X) slot 0
NIM (Network Interface Modules) slots 3
Onboard ISC slot 1
DDRM (data plane) 2 GB (default) / 2 GB (maximum)
DDRM (control/services plane) 4 GB (default) / 16 GB (maximum)
Flash Memory 8 GB (default) / 32 GB (maximum)
Power-supply options Internal: AC, DC, and PoE
Rack height 1 RU
Dimensions (H x W x D) 43.9 x 438.15 x 507.2 mm
Package Weight 20.88 Kg
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Aggregate Throughput 500Mbps to 1Gbps
Total onboard WAN or LAN 10/100/1000 ports 4
RJ-45-based ports 4
SFP-based ports 4
Enhanced service-module slots 0
Doublewide service-module slots 0
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) NA
Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) NA
Default memory DDR3 ECC DRAM (data plane) 2 GB
Maximum memory DDR3 ECC DRAM (data plane) 2 GB
Default memory DDR3 ECC DRAM (control/services plane) 4 GB
Maximum memory DDR3 ECC DRAM (control/services plane) 16 GB
Default flash memory 8 GB
Maximum flash memory 32 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 Internal: AC, DC, and PoE
AC input voltage 100 to 240 VAC autoranging
AC input frequency 47 to 63 Hz

Frequently Asked Questions

What is Cisco ISR4431/K9?

The Cisco ISR4431/K9 is an enterprise-grade branch router from the Cisco 4000 Series Integrated Services Routers. It is designed for secure WAN connectivity, application-aware routing, and scalable enterprise networking, making it suitable for medium to large branch offices and WAN edge deployments

What is the Cisco ISR4431/K9 mainly used for?

The ISR4431/K9 is commonly deployed for: Enterprise branch WAN routing MPLS and internet edge connectivity Secure VPN connectivity Hybrid cloud networking Voice, video, and data convergence It is widely used as a primary branch edge router in Cisco enterprise environments.

Does ISR4431/K9 support SD-WAN?

Yes. The ISR4431 platform supports Cisco IOS XE, enabling SD-WAN deployments with centralized control, application-aware routing, and secure multi-site connectivity — one of the main reasons this model is still highly searched by IT teams.

What is the throughput of Cisco ISR4431/K9?

The ISR4431/K9 typically offers aggregate throughput around 500 Mbps, depending on licensing and configuration. This makes it suitable for enterprise branch offices handling voice, video, and secure business traffic.

Is Cisco ISR4431/K9 still supported by Cisco?

The ISR4431 series is End-of-Sale, but support continues for several years. End-of-Sale: 7 Nov 2023 End-of-Support: 30 Nov 2028 This lifecycle status is frequently searched by enterprises planning upgrade strategies.

Is ISR4431/K9 good for enterprise branch offices?

Yes. It is widely used because it provides: Enterprise-level routing performance Secure WAN connectivity Modular expandability Stable long-term Cisco support This makes it ideal for business-critical branch networking.

Which industries commonly use Cisco ISR4431/K9?

The ISR4431/K9 is widely deployed across: Banking & Financial Services Healthcare & Hospitals Enterprise Corporate Offices Retail Chains & Franchises Education Institutions Manufacturing & Logistics Government Organizations These industries rely on secure, reliable branch WAN connectivity.

Can ISR4431/K9 be used for cloud and hybrid IT environments?

Yes. ISR4431/K9 supports secure WAN routing and SD-WAN integration, enabling branch offices to connect safely to public cloud platforms, SaaS applications, and hybrid data center environments.

How is ISR4431/K9 different from ISR4351/K9?

Key difference: ISR4351/K9: Mid-range branch performance ISR4431/K9: Higher throughput and scalability for larger branches Companies often compare these two models when choosing between performance and budget.

Why is ISR4431/K9 still heavily searched on the internet?

This model remains popular because: Large installed enterprise base Strong compatibility with Cisco environments SD-WAN migration capability Reliable long-term enterprise performance Many organizations still deploy or maintain ISR4431 routers, keeping search demand high.

Is Cisco ISR4431/K9 still supported by Cisco?

The ISR4431 series is End-of-Sale, but support continues for several years. End-of-Sale: 7 Nov 2023 End-of-Support: 30 Nov 2028 This lifecycle status is frequently searched by enterprises planning upgrade strategies.

What ports and interfaces are available on ISR4431/K9?

Typical hardware includes: 4 × Gigabit Ethernet RJ-45 ports 3 × NIM expansion slots Service module support Dedicated management interfaces Its modular architecture allows organizations to expand WAN and service capabilities as needed.


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