| Detail: |
500Mbps-1Gbps system throughput, 4 WAN/LAN ports, 4 SFP ports, multi-Core CPU, Dual-power, Security, Voice, WAAS,
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Cisco ISR4431-AX/K9 Integrated Services Router
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Categories: Cisco Router ISR 4000, Cisco Routers, Routers
Brand: Cisco
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| Description | Cisco ISR 4431 Advanced services router (2GE,2NIM,1SM,4G FLASH,4G DRAM,MPLS, OTV) |
| 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
The ISR4431-AX/K9 is a Cisco 4000 Series Integrated Services Router bundled with the AX (Application Experience) license, designed for enterprise branch networking. It combines secure WAN routing, advanced application services, and modular expansion, making it suitable for medium to large enterprise deployments.
“AX” refers to the Application Experience bundle, which includes enhanced software licensing for application-aware services, security, and advanced enterprise routing capabilities beyond the base ISR4431 hardware. This licensing model is one of the most searched topics when buyers compare ISR models.
The router is commonly deployed for: Enterprise branch WAN routing Application-aware traffic management Secure VPN connectivity Hybrid cloud networking Multi-service branch architecture It is widely used as a high-performance branch edge router in Cisco enterprise environments.
The ISR4431-AX/K9 supports around 500 Mbps aggregate throughput (licensing and configuration dependent), making it suitable for medium-to-large enterprise branch offices handling voice, video, and business application traffic.
Yes. The ISR4431 platform runs Cisco IOS XE, allowing SD-WAN deployment with centralized policy management, secure routing, and application-aware WAN optimization — a key reason this model remains highly searched by enterprise network teams.
Typical hardware includes: 4 × Gigabit Ethernet RJ-45 interfaces 3 × NIM expansion slots Modular service expansion Management and console ports This modular design allows businesses to scale WAN and service requirements easily.
The ISR4431 family is: End-of-Sale: 7 Nov 2023 End-of-Support: 30 Nov 2028 Because many enterprises still run ISR 4000 networks, lifecycle questions are frequently searched online.
Search demand remains strong because: Large enterprise installed base Application Experience license adds value SD-WAN migration compatibility Reliable Cisco branch performance Many organizations are upgrading, replacing, or integrating existing ISR4431 deployments.
The ISR4431-AX/K9 is widely deployed across industries requiring reliable branch networking: Banking & Financial Services Healthcare & Hospitals Enterprise Corporate Networks Retail Chains & Franchises Education & Universities Manufacturing & Logistics Government & Public Sector These industries rely on secure, application-aware WAN connectivity.
Yes. It supports secure WAN connectivity to cloud environments, SaaS platforms, and hybrid data centers, enabling centralized policy control and optimized application performance across distributed enterprise branches.
Key difference: ISR4431/K9 → Base hardware platform ISR4431-AX/K9 → Includes Application Experience licensing for advanced services Companies often compare these models when choosing between basic routing and application-aware branch networking.
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