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Kevin Marshall
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Strong security performance for mid size deployments. Stable and efficient.
ISR4431-SEC/K9
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500Mbps-1Gbps system throughput, 4 WAN/LAN ports, 4 SFP port...
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Name:
ISR4431-SEC/K9
- Description:
- 500Mbps-1Gbps system throughput, 4 WAN/LAN ports, 4 SFP ports, multi-Core CPU, Dual-power, Security, Voice, WAAS, Intelligrnt WAN, OnePK, AVC, separate control data and services CPUs
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 759382395937
- Condition:
- Warranty:
- 3
- List Price:
$20,447.00
- Price:
$10,060.0050.8% off
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1
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ISR4431-SEC/K9 Overview
ISR4431-SEC/K9 is a high-performance, modular integrated services router engineered for enterprise-grade secure connectivity, leveraging a modular architecture with flexible power options and redundant capabilities. It is designed with dual WAN interfaces and multiple LAN ports that support 10/100/1000 Ethernet, enabling robust internet access and internal connectivity for voice, video, and data applications.
This router integrates advanced VPN features including IPSec, SSL VPN, DMVPN, and FlexVPN for secure remote access, while its built-in firewall and intrusion prevention systems deliver strong security performance. Its throughput capacity of up to 300 Mbps, high availability support, and modular expansion slots make ISR4431-SEC/K9 an ideal solution for enterprises requiring reliable, scalable connectivity in diverse deployment scenarios.
ISR4431-SEC/K9 price is $10,060.00, a 50.8% saving from the Cisco list price of $20,447.00. ISR4431-SEC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4431-SEC/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4431-SEC/K9 Specifications
- Form Factor
- Rack-mount
- Ethernet Technology
- 10/100/1000
- Height
- 1.73 inches
- Width
- 17.3 inches
- Memory
- 4 GB
- Power Source
- AC Power Supply with Redundant Option
- Flash Memory
- 512 MB
- Depth
- 16.1 inches
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Device Type
- Router
- VPN Support
- IPSec / SSL VPN / DMVPN / FlexVPN
- Routing Protocols
- OSPF / EIGRP / BGP / RIP / Static Routing
- Network Protocols
- IPv4, IPv6
- Remote Management
- SSH, Telnet, SNMP
- Integrated Services
- Voice, Video, WAN Optimization
- High Availability Support
- Supported
- Broadband
- N/A
- Use Case
- Enterprise
- LAN Ports
- 4 LAN Ports
- Expansion Slots
- EHWIC / NIM
- Built-in Security Features
- Firewall, Intrusion Prevention, Malware Protection
- Product Type
- Integrated Services Router
- Compliance Standards
- FCC, CE, UL
- Architecture
- Modular
- Speed/Capacity
- Gigabit
- Interface Ports
- RJ-45, SFP
- Power
- 250W
- Throughput Capacity
- 300 Mbps
- Features
- VPN, MPLS, Firewall, IPv6 Compatible
- Product Name
- Cisco ISR4431-SEC/K9
- Weight
- 11.0 lbs
ISR4431-SEC/K9 Use Case
High-Availability Branch Office Connectivity with Intelligent WAN
In a mid-sized branch environment, the ISR4431-SEC/K9 aggregates dual ISP and fiber services across its 4 WAN/LAN and 4 SFP ports, while the multi-Core CPU and separate control, data and services CPUs guarantee deterministic voice and data performance. Cisco Intelligent WAN (IWAN) and Cisco AVC prioritize VoIP and business-critical traffic, and dual-power modules deliver sub-second failover, achieving 99.999% uptime, seamless voice calls and secure, high-speed connectivity at 500 Mbps–1 Gbps.
Secure, Automated Retail Point-of-Sale and Voice Infrastructure
At distributed retail locations, the ISR4431-SEC/K9 secures PCI-sensitive POS transactions with integrated Cisco IOS XE firewall and advanced threat defense, while its AVC engine classifies and prioritizes VoIP, video surveillance and inventory data across 4 LAN and 4 SFP ports. Cisco OnePK programmability automates site provisioning, and dual-power redundancy ensures uninterrupted operations, delivering PCI DSS compliance, 30% faster payment processing and 99.9% service availability.
Campus-Wide SaaS Acceleration and Network Segmentation
In a large campus deployment, the ISR4431-SEC/K9 uses Cisco WAAS for WAN application acceleration, boosting SaaS and virtual desktop performance by up to 3× over 500 Mbps–1 Gbps links. Separate control, data and services CPUs isolate management and security workloads, while Cisco Intelligent WAN and OnePK automate path optimization and policy enforcement, reducing latency by 40% and simplifying centralized network operations.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| ISR4431-SEC/K9 |  ISR4461-SEC/K9 |  ISR4451-X-V/K9 |  ISR4321-SEC/K9 |  ISR4431-DNA | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Modular | Fixed | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE, UL | FCC, CE, UL, RoHS | FCC / CE / UL | FCC, CE | IEEE / FCC / CE |
| Connectivity Type | Wired | Wired | Ethernet | Wired | Wired |
| Depth | 16.1 inches | N/A | 18 inches | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | EHWIC / NIM | EHWIC | NIM | NIM, EHWIC | EHWIC / NIM / SFP+ |
| Features | VPN, MPLS, Firewall, IPv6 Compatible | VPN, VoIP, IPv6 Compatible, Firewall, POE, MPLS, Syslog | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN, Firewall, IPv6 Compatible | VPN / Firewall / VoIP / IPv6 Compatible / MPLS / Integrated Services |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 512 MB | 1 GB | 2 GB | 1 GB | 512 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.73 inches | N/A | 1.75 inches | N/A | N/A |
| 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, Combo Ports | RJ-45 / SFP | RJ-45, SFP | RJ-45 / SFP |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN | 2 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 4 GB | 2 GB | 4 GB |
| Modular Slots Available | 2 Slots | 2 Slots | 3+ Slots | 1 Slot | 3+ Slots |
| Network Protocols | IPv4, IPv6 | TCP/IP, IPv4, IPv6, MPLS | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4, IPv6, MPLS |
| Power | 250W | 370 W | 370W | 75W | 150 W |
| Power Source | AC Power Supply with Redundant Option | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / DC Power Supply (Redundant) | AC Power Supply / DC Power Supply / Redundant |
| Product Name | Cisco ISR4431-SEC/K9 | Cisco ISR4461-SEC/K9 | Cisco ISR4451-X-V/K9 | Cisco ISR4321-SEC/K9 | ISR4431-DNA |
| Product Type | Integrated Services Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | SSH, Telnet, SNMP | SSH / Telnet / SNMP | SSH, Telnet, SNMP | SSH / Telnet / SNMP / NETCONF |
| Routing Protocols | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing / MPLS | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 300 Mbps | 2 Gbps | 2 Gbps | 300 Mbps | 1.2 Gbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise, Small Business | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Modular WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | Modular WAN | 2 WAN Ports | Modular WAN |
| Weight | 11.0 lbs | N/A | 30 lbs | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.3 inches | N/A | 17.5 inches | N/A | N/A |
| Wireless Support | No | No | No | No | No |
Reviews & Ratings
R
Ryan Whitfield
4
Good balance of throughput and security features. Easy to manage.
S
Scott Bennett
4
Cisco ISR reliability with modern security services. No complaints.
O
Oliver Grant
5
Handles VPN and firewall workloads smoothly. Consistent uptime.
D
Derek Lawson
5
Solid router for secure WAN edge use.
Questions & Answers
What is the throughput performance of the Cisco ISR4431-SEC/K9 router?
The ISR4431-SEC/K9 delivers system throughput from 500 Mbps up to 1 Gbps, ensuring high-performance WAN connectivity for medium to large branch deployments.
How many WAN/LAN ports does the ISR4431-SEC/K9 support?
The router includes four integrated Gigabit Ethernet WAN/LAN ports, providing flexible connectivity for diverse network architectures.
How many SFP uplink ports are available on the ISR4431-SEC/K9?
The ISR4431-SEC/K9 features four built-in SFP ports, enabling fiber-based uplinks for long-reach connectivity and high-availability links.
Does the ISR4431-SEC/K9 support dual redundant power supplies?
Yes. It offers dual-power-supply capability for N+1 redundancy, ensuring uninterrupted operation in branch and campus environments.
What advanced security features are included in the ISR4431-SEC/K9?
The router integrates next-generation firewall, IPS, VPN, URL filtering, and advanced malware protection to secure branch networks end-to-end.
Can the ISR4431-SEC/K9 handle voice and unified communications?
Yes. It supports Cisco Unified Communications and Voice over IP (VoIP) services, delivering secure, high-quality voice and video at the branch.
What is Cisco WAAS on the ISR4431-SEC/K9?
Cisco WAAS (Wide Area Application Services) accelerates application performance over the WAN, reducing latency and optimizing bandwidth usage.
How does Intelligent WAN (IWAN) work on the ISR4431-SEC/K9?
Intelligent WAN uses dynamic path selection, performance-based routing, and application-aware policies to optimize and secure WAN transport.
What is Cisco OnePK and how is it supported?
Cisco One Platform Kit (OnePK) provides a set of open APIs for programmability and automation. The ISR4431-SEC/K9 fully supports OnePK for custom applications.
What role does AVC play on the ISR4431-SEC/K9?
Application Visibility and Control (AVC) identifies, classifies, and prioritizes applications in real time, ensuring critical services receive the appropriate QoS.
Describe the CPU architecture of the ISR4431-SEC/K9.
The router uses a multi-core CPU design with separate control, data, and services processors for optimized performance and resource isolation.
Which Cisco IOS software does the ISR4431-SEC/K9 run?
It runs Cisco IOS XE Software with Security (SEC) licensing, delivering advanced routing, security, and services in a single image.
What are common deployment scenarios for the ISR4431-SEC/K9?
Ideal for medium to large branch offices, retail locations, and campus aggregation, supporting secure WAN, voice, collaboration, and cloud-based services.
How is the ISR4431-SEC/K9 managed and monitored?
Management options include CLI, Cisco Prime Infrastructure, DNA Center, and support for SNMP, NetFlow, RESTCONF, and streaming telemetry.
Does the ISR4431-SEC/K9 support virtualization?
Yes. It supports Cisco IOS XE SD-WAN and NFV virtualization, enabling multiple virtual network functions on a single platform.
What are the physical dimensions and environmental specs?
The ISR4431-SEC/K9 measures 1RU (44.45 mm H × 442 mm W × 295 mm D), operating from 0 °C to 40 °C and storing from –40 °C to 70 °C.