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

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What Network Interface Modules (NIMs) are compatible with ISR4431-SEC/K9?

Product Code Cisco

ISR4431-SEC/K9
Bundle Security Bundle
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

 

Table 2 shows some recommended modules, cards and accessories of Cisco 

ISR4431-SEC/K9.

Items

Models

Descriptions

Console and Auxillary Cables

CAB-AUX-RJ45

Cisco

CAB-AUX-RJ45 Auxiliary Cable 8ft with RJ45 and DB25M

CAB-ETH-S-RJ45

Cisco Router Cable CAB-ETH-S-RJ45

CAB-CONSOLE-RJ45

Cisco

CAB-CONSOLE-RJ45 Console Cable 6ft with RJ45 and DB9F

CAB-CONSOLE-USB

Cisco

CAB-CONSOLE-USB Console Cable 6 ft with USB Type A and mini-B

Network Interface Modules

NIM-1MFT-T1/E1

Cisco Fourth-Generation Multiflex Trunk Voice and WAN network interface module

NIM-2CE1T1-PRI

Cisco Multiflex Trunk Voice and WAN network interface module

NIM-4E/M

Analog voice network interface card (ear and mouth)

NIM-2FXS

Cisco Analog voice network interface card

NIM-2FXS

NIM-2FXS/4FXO

Cisco Analog voice network interface card

NIM-2FXS/4FXO

NIM-8MFT-T1/E1

Cisco Fourth-Generation Multiflex Trunk Voice and WAN network interface module

SFPs for On-Board GE Ports

GLC-SX-MMD

Cisco

GLC-SX-MMD 1000BASE-SX SFP transceiver module, MMF, 850nm, DOM

GLC-LH-SMD

Cisco

GLC-LH-SMD 1000BASE-LX/LH SFP transceiver module, MMF/SMF, 1310nm, DOM

GLC-ZX-SMD

Cisco

GLC-ZX-SMD 1000BASE-ZX SFP transceiver module, SMF, 1550nm, DOM
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☆ ☆ ☆ ☆ ☆

Type Cisco ISR4431/K9 with Security Bundle
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
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) 65
Maximum power with AC power supply (watts) 250 (no PoE)
Maximum power with PoE power supply (platform only) (watts) 500 with PoE redundant
Maximum endpoint PoE power available from PoE power supply (watts) 250 W with optional redundancy

Frequently Asked Questions

What is the Cisco ISR4431-SEC/K9?

The Cisco ISR4431-SEC/K9 is a high-performance Integrated Services Router (ISR) from the 4000 Series, bundled with the Security License (SEC/K9). It is designed to deliver advanced routing, WAN aggregation, and enterprise-grade security in a single platform. It supports throughput of up to 500 Mbps and is ideal for medium to large enterprise branch deployments.

What does "SEC/K9" mean in ISR4431-SEC/K9?

SEC stands for Security Bundle, and K9 indicates the device supports strong cryptographic encryption (such as AES-256, IPsec VPN, SSL/TLS). Together, SEC/K9 means the router includes: Cisco IOS XE Security License Advanced firewall capabilities VPN (IPsec/DMVPN/FlexVPN) Intrusion Prevention System (IPS) Zone-Based Firewall (ZBFW)

What VPN technologies does the ISR4431-SEC/K9 support?

The router supports a comprehensive range of VPN solutions including IPsec Site-to-Site VPN, DMVPN (Dynamic Multipoint VPN), FlexVPN, GET VPN (Group Encrypted Transport), SSL VPN (Cisco AnyConnect), and MPLS-based VPNs. This makes it ideal for enterprises connecting multiple branch offices securely over public internet or MPLS clouds.

Does the ISR4431-SEC/K9 support SD-WAN?

Yes. The ISR4431-SEC/K9 is fully compatible with Cisco SD-WAN (Viptela/IOS XE SD-WAN). Organizations can upgrade the router to run SD-WAN software, enabling centralized policy management, application-aware routing, zero-touch provisioning (ZTP), and cloud-based traffic optimization — making it future-ready for modern network architectures.

How much throughput can the ISR4431-SEC/K9 handle?

The ISR4431-SEC/K9 delivers up to 500 Mbps of aggregate throughput with simultaneous services enabled. With IPsec encryption running, performance can vary based on packet size and active features. For environments requiring higher throughput, Cisco recommends considering the ISR4451-X or Catalyst 8300 Series routers.

What Network Interface Modules (NIMs) are compatible with ISR4431-SEC/K9?

The ISR4431-SEC/K9 supports a wide range of NIM (Network Interface Module) cards including: NIM-2T / NIM-4T – Serial WAN connectivity NIM-ES2-4 / NIM-ES2-8 – LAN switching modules NIM-1GE-CU-SFP – SFP-based Gigabit Ethernet NIM-4G-LTE – 4G LTE cellular WAN backup NIM-VAB-A / NIM-2BRI-NT/TE – Voice modules NIM-SSD – Solid-state storage modules

Can the ISR4431-SEC/K9 be used for voice and unified communications?

Yes. With the appropriate PVDM (Packet Voice DSP Module) and UC license, the ISR4431-SEC/K9 supports voice gateway functionality including SIP trunking, H.323, MGCP, SRST (Survivable Remote Site Telephony), and integration with Cisco Unified Communications Manager (CUCM). This makes it a converged voice, data, and security platform.

What is the difference between ISR4431/K9 and ISR4431-SEC/K9?

The ISR4431/K9 is the base router with standard IP routing features. The ISR4431-SEC/K9 includes all base features plus the Security Bundle license which unlocks: Advanced VPN encryption (IPsec, DMVPN, SSL VPN) Cisco IOS Firewall & IPS features Web Security Essentials (WSE) Cisco Umbrella integration support If your deployment requires secure tunneling, firewall policies, or threat protection, the SEC/K9 variant is the recommended choice.

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