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ISR4431/K9
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Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM,IPB)
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Name:
ISR4431/K9
- Description:
- Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM,IPB)
- Rating:
Added to cart 28 times recently
- Availability:
Ready to Ship
- Brand:
- Cisco
- GTIN:
- 818260814745
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$16,566.00
- Price:
$3,856.0076.7% off
Quantity:
1
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ISR4431/K9 Overview
ISR4431/K9 is a high-performance integrated services router featuring a fixed chassis design with modular expansion slots that cater to critical enterprise applications. It provides multiple WAN and LAN interfaces, versatile power options including redundant capabilities, and integrated services such as voice and video to meet secure branch connectivity requirements.
ISR4431/K9 delivers robust VPN features with IPSec, SSL, GRE, DMVPN, and FlexVPN support, ensuring secure remote access. With gigabit Ethernet technology, proven throughput capacity, built‑in firewall and intrusion prevention, and support for advanced routing protocols, this router is an ideal choice for enterprise branches demanding reliable, high-performance connectivity and redundancy.
ISR4431/K9 price is $3,856.00, a 76.7% saving from the Cisco list price of $16,566.00. ISR4431/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4431/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4431/K9 Specifications
- Product Type
- Enterprise Router
- Brand
- Cisco
- VPN Support
- IPSec / SSL VPN / GRE / DMVPN / FlexVPN
- Power Source
- AC Power Supply / DC Power Supply / Redundant
- Routing Protocols
- OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing
- Architecture
- Fixed
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- LAN Ports
- 4 LAN Ports
- Ethernet Technology
- 10/100/1000
- Connectivity Type
- Wired
- Network Protocols
- IPv4, IPv6
- Remote Management
- CLI / SNMP / NETCONF / RESTCONF
- Compliance Standards
- FCC, CE, RoHS
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN / VoIP / IPv6 Compatible / Firewall
- Use Case
- Enterprise
- Management
- Managed
- Form Factor
- Rack-mount
- Integrated Services
- Voice / Video / WAN Optimization
- High Availability Support
- Supported
- Safety
- UL
- EMC
- FCC
- Throughput Capacity
- 0.2 Gbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Expansion Slots
- NIM / EHWIC / SFP+
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 4 GB
- Flash Memory
- 512 MB
- Interface Ports
- RJ-45 / SFP+
- Power
- 275 W
- Device Type
- Router
- Product Name
- Cisco ISR 4431 Integrated Services Router (K9)
- Height
- 1.73 inches
- Width
- 17.2 inches
- Depth
- 16.3 inches
- Weight
- 31 lbs
ISR4431/K9 Use Case
Secure SD-WAN Edge for Multi-Branch Retail Network
Deploy the ISR4431/K9 Cisco ISR 4431 (4GE, 3NIM, 8G FLASH, 4G DRAM, IPB) as a Cisco SD-WAN edge router across 50+ retail outlets to aggregate MPLS and internet links, enable dynamic path selection, and enforce centralized security policies. Outcome: Cuts WAN connectivity costs by 30%, boosts application uptime to 99.99%, and simplifies branch-to-cloud management via Cisco vManage.
High-Performance Hybrid Cloud Connectivity for Financial Services
Use the ISR4431/K9 Cisco ISR 4431 (4GE, 3NIM, 8G FLASH, 4G DRAM, IPB) at headquarters to establish AES-256 IPsec tunnels to AWS, Azure, and on-premises data centers with granular QoS and encryption. Outcome: Delivers secure 200 Mbps throughput, meets FINRA compliance, and achieves 99.95% availability for latency-sensitive trading and risk-analysis applications.
Industrial IoT Edge Security and Network Segmentation
Implement the ISR4431/K9 Cisco ISR 4431 (4GE, 3NIM, 8G FLASH, 4G DRAM, IPB) in manufacturing facilities to segment IT/OT traffic, apply DPI-powered firewalling, and support MQTT/OPC protocols for real-time automation. Outcome: Reduces cyber-attack surface by 55%, ensures ISA/IEC 62443 compliance, and delivers deterministic, low-latency connectivity for critical industrial processes.
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Product Comparison Table 
| ISR4431/K9 |  C1-CISCO4321/K9 |  ISR4351-DNA |  ISR4461-SEC/K9 |  ISR4331-V/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Modular | Modular | Modular | Modular |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE, RoHS | FCC / CE | FCC / CE | FCC, CE, UL, RoHS | CE / FCC / UL |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Device Type | Router | Router | Router | Router | Router |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM / EHWIC / SFP+ | NIM / EHWIC | EHWIC | EHWIC | EHWIC / NIM / SM-X |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization | VPN / Firewall / Voice / Video / WAN Optimization | VPN, VoIP, IPv6 Compatible, Firewall, POE, MPLS, Syslog | VPN / Voice / Video / IPv6 Compatible / Firewall / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 512 MB | 512 MB | 256 MB | 1 GB | 2 GB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 / SFP+ | RJ-45 / SFP | RJ-45 / SFP | RJ-45, SFP, Combo Ports | RJ-45 / SFP |
| LAN Ports | 4 LAN Ports | Modular LAN | Modular LAN | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 1 GB | 4 GB | 4 GB | 4 GB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 3+ Slots |
| Network Protocols | IPv4, IPv6 | IPv4, IPv6 | IPv4 / IPv6 | TCP/IP, IPv4, IPv6, MPLS | IPv4 / IPv6 / MPLS |
| Power | 275 W | 110 W | 115W | 370 W | 250 W |
| Power Source | AC Power Supply / DC Power Supply / Redundant | AC Power Supply with Redundant Options | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant |
| Product Name | Cisco ISR 4431 Integrated Services Router (K9) | Cisco 4321 Integrated Services Router (C1-CISCO4321/K9) | Cisco ISR4351-DNA | Cisco ISR4461-SEC/K9 | Cisco ISR 4331 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI / SNMP / NETCONF / RESTCONF | SSH / Telnet / SNMP | CLI / SNMP / Cisco DNA Center | SSH, Telnet, SNMP | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | No | No | Yes |
| Throughput Capacity | 0.2 Gbps | 0.15 Gbps | 1 Gbps | 2 Gbps | 0.15 Gbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise | Enterprise / Branch |
| VPN Support | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | Modular WAN | 2 WAN | 2 WAN |
| Wireless Support | No | No | No | No | No |
Compliance & Warranty
100% Genuine Product Guarantee
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
A
Alexander Hughes
5
Cisco ISR 4431 delivers reliable routing with 4GE and 3NIM. High-performance for medium to large branch offices with seamless voice and UC support.
S
Sophie Martin
4
Durable and predictable. Maintains secure network operations and smooth UC performance under high workloads.
B
Benjamin Clark
4
Easy to deploy and manage. Provides consistent IP routing, voice, and secure communications.
E
Emily Watson
5
High-performing and robust. Ideal for enterprise branches needing reliable UC, voice, and data connectivity.
M
Matthew Scott
5
Strong Cisco solution. Ensures predictable routing, UC, and network performance across multiple endpoints.
Questions & Answers
What is the Cisco ISR 4431 (ISR4431/K9) and its primary purpose?
The Cisco ISR 4431 (ISR4431/K9) is a modular branch router designed to deliver secure, high-performance WAN connectivity and application optimization for medium-sized enterprises.
What are the key hardware specifications of the ISR 4431?
It features four integrated Gigabit Ethernet ports, three NIM slots for flexible interface expansion, 8 GB flash memory, 4 GB DRAM, and an internal power bracket (IPB).
How much throughput performance does the ISR 4431 deliver?
The ISR 4431 delivers up to 1 Gbps aggregate throughput across data, security, and application services in a single platform.
How many network modules can be installed in the ISR 4431?
It supports up to three Network Interface Modules (NIMs) for diversified WAN, LAN, and service connectivity.
What security features are integrated in the ISR 4431?
It includes Cisco Firepower threat defense, zone-based firewall, VPN encryption, and intrusion prevention for comprehensive branch security.
Does the ISR 4431 support virtualization and NFV?
Yes, it runs Cisco IOS XE NFV to host virtual network functions such as vWAN, vFE, and virtual ASA within the router.
Which operating system does the ISR 4431 use?
The ISR 4431 operates on Cisco IOS XE, providing a modern, modular OS with programmability and automation features.
Is the power supply included with the ISR4431/K9 model?
Yes, the ISR4431/K9 ships with an internal power bracket (IPB) to simplify deployment without external power adapters.
What licensing options are available for the ISR 4431?
It offers Cisco Smart Licensing with two tiers—Network Essentials and Network Advantage—enabling on-demand activation of advanced features.
Which deployment scenarios are ideal for the ISR 4431?
It is ideal for medium branch offices requiring secure WAN connectivity, unified communications, cloud integration, and application optimization.
Can the ISR 4431 integrate with Cisco DNA Center?
Yes, it fully supports Cisco DNA Center for policy-based automation, real-time assurance, and end-to-end network management.
What rack-mounting options are available for the ISR 4431?
An optional 1U rack-mount kit is available for 19″ racks, while desktop deployment is supported out of the box.
How can I manage and monitor the ISR 4431?
Management is available via Cisco IOS XE CLI, Cisco Prime Infrastructure, Cisco DNA Center, and RESTful APIs for full life-cycle automation.
What warranty and support packages are offered for the ISR 4431?
It includes a 1-year hardware warranty. Cisco SMARTnet provides 24×7 support, next-business-day hardware replacement, and software updates.
What are the power consumption and environmental specifications?
Typical power consumption is approx. 50 W. Operating temperature ranges from 0 °C to 40 °C with 5–90% non-condensing humidity.