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ISR4431/K9
Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM,IPB)
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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.
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.
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.
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.
To get the detailed certification, please go to the Compliance Center.
| 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 |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| 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 |
| Depth | 16.3 inches | 20 inches | N/A | N/A | 13.9 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC | 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 | 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 |
| Height | 1.73 inches | 1.75 inches | N/A | N/A | 4.33 inches |
| 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 |
| Safety | UL | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | No | No | Yes |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| 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 |
| Weight | 31 lbs | 14 lbs | N/A | N/A | 19 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.2 inches | 17.5 inches | N/A | N/A | 17.4 inches |
| Wireless Support | No | No | No | No | No |
Cisco ISR 4431 delivers reliable routing with 4GE and 3NIM. High-performance for medium to large branch offices with seamless voice and UC support.
Durable and predictable. Maintains secure network operations and smooth UC performance under high workloads.
Easy to deploy and manage. Provides consistent IP routing, voice, and secure communications.
High-performing and robust. Ideal for enterprise branches needing reliable UC, voice, and data connectivity.
Strong Cisco solution. Ensures predictable routing, UC, and network performance across multiple endpoints.
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.
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).
The ISR 4431 delivers up to 1 Gbps aggregate throughput across data, security, and application services in a single platform.
It supports up to three Network Interface Modules (NIMs) for diversified WAN, LAN, and service connectivity.
It includes Cisco Firepower threat defense, zone-based firewall, VPN encryption, and intrusion prevention for comprehensive branch security.
Yes, it runs Cisco IOS XE NFV to host virtual network functions such as vWAN, vFE, and virtual ASA within the router.
The ISR 4431 operates on Cisco IOS XE, providing a modern, modular OS with programmability and automation features.
Yes, the ISR4431/K9 ships with an internal power bracket (IPB) to simplify deployment without external power adapters.
It offers Cisco Smart Licensing with two tiers—Network Essentials and Network Advantage—enabling on-demand activation of advanced features.
It is ideal for medium branch offices requiring secure WAN connectivity, unified communications, cloud integration, and application optimization.
Yes, it fully supports Cisco DNA Center for policy-based automation, real-time assurance, and end-to-end network management.
An optional 1U rack-mount kit is available for 19″ racks, while desktop deployment is supported out of the box.
Management is available via Cisco IOS XE CLI, Cisco Prime Infrastructure, Cisco DNA Center, and RESTful APIs for full life-cycle automation.
It includes a 1-year hardware warranty. Cisco SMARTnet provides 24×7 support, next-business-day hardware replacement, and software updates.
Typical power consumption is approx. 50 W. Operating temperature ranges from 0 °C to 40 °C with 5–90% non-condensing humidity.