ISR4451-X-AX/K9 Cisco ISR4451 Application Experience (AX) Bundle Integrated Services Router
Cisco ISR4451-X-AX/K9 ISR 4451 Application Experience (AX) Bundle
Intelligent Integrated Services Router for High-Performance Branch Applications
The Cisco ISR4451-X-AX/K9 Integrated Services Router is a high-performance, enterprise-grade branch router designed to deliver a complete “branch-in-a-box” solution. Built for modern distributed enterprises, this router integrates advanced routing, security, and application optimization to ensure reliable, secure, and high-quality connectivity for business-critical operations.
Bundled with the Application Experience (AX) package, the ISR4451-X includes AppX and Security licenses, enabling Cisco WAAS WAN optimization, Application Visibility and Control (AVC), deep packet inspection, and advanced firewall protection. This allows organizations to prioritize critical applications, optimize bandwidth usage, and maintain superior user experience across WAN links.
Powered by a multicore CPU architecture with dedicated control and data planes, the router ensures consistent throughput even when running resource-intensive services such as encryption, application monitoring, and threat protection. It delivers 1 Gbps throughput by default, scalable up to 2 Gbps via performance licensing, providing a flexible pay-as-you-grow upgrade path.
The ISR4451-X supports 4 onboard Gigabit LAN/WAN ports, along with 3 NIM slots and 2 SM-X service module slots, enabling extensive customization for connectivity, voice, security, and WAN services. Integrated security features such as Zone-Based Firewall (ZBFW), Cisco Snort Intrusion Prevention, and IPsec VPN encryption protect branch networks while maintaining high-performance secure connectivity.
Designed for reliability and uptime, the router supports dual redundant power supplies and modular components, ensuring business continuity in mission-critical branch environments.
Ideal for enterprise branches, SD-WAN edge deployments, and secure WAN connectivity, the Cisco ISR4451-X-AX/K9 delivers scalable performance, advanced security, and application-aware networking in a single platform.
Product Specifications - Cisco ISR4451-X-AX/K9 Integrated Services Router 4400 Series
| Category | Specification |
|---|---|
| Manufacturer | Cisco Systems |
| Model Number | ISR4451-X-AX/K9 |
| Product Series | Cisco 4400 Series Integrated Services Routers |
| Router Type | Enterprise Branch Integrated Services Router |
| Bundle Package | AX Bundle (Application Experience) |
| Default Software Licenses | IP Base, AppX License, Security (SEC) License |
| Aggregate Throughput | 1 Gbps default / up to 2 Gbps (performance license upgrade) |
| Processor Architecture | Multicore CPU with separate control & data planes |
| Total Onboard LAN/WAN Ports | 4 × 10/100/1000 Mbps (RJ-45 or SFP combo) |
| Network Interface Module Slots | 3 × NIM slots |
| Service Module Slots | 2 × SM-X slots |
| Internal Services Slots | 1 × ISC slot (for future service expansion) |
| Memory (DRAM) | 4 GB default / up to 16 GB maximum |
| Flash Memory | 8 GB default / up to 32 GB maximum |
| Storage Expansion | Optional external USB storage support |
| VPN Throughput | High-performance IPsec VPN with hardware acceleration |
| Security Features | Zone-Based Firewall (ZBFW), Cisco Snort IPS, URL filtering, advanced threat defense |
| Application Optimization | Cisco WAAS, Application Visibility & Control (AVC), QoS optimization |
| Routing Protocols | OSPF, EIGRP, BGP, IS-IS, RIP, Policy-Based Routing |
| WAN Optimization | Integrated WAN acceleration & traffic prioritization |
| Voice & Collaboration Support | Unified Communications support via SM-X modules |
| High Availability | Dual redundant power supply support |
| Power Supply Options | AC and DC redundant PSU options |
| Rack Height | 2RU rack-mountable |
| Management Interfaces | CLI, Web UI, SNMP, NetFlow, Cisco DNA Center, REST APIs |
| Operating System | Cisco IOS XE |
| USB Ports | 2 × USB 2.0 ports |
| Console Ports | RJ-45 & Mini-USB console |
| Encryption Support | Hardware-based encryption acceleration |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) |
| Humidity Range | 5%–85% non-condensing |
| Compliance & Standards | IEEE networking standards, RoHS compliant |
| Typical Deployment | Enterprise branches, SD-WAN edge, secure WAN connectivity, multi-service branch offices |
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FAQs:
Q1. What is the difference between the ISR 4451-X and the 4451-X-AX/K9?
The AX/K9 is a bundle that includes the Security (SEC) and Application Experience (AppX) licenses. The standard 4451-X typically ships with only the IP Base license, requiring separate license purchases for advanced features.
Q2. Can I use Nim modules from the older ISR G2 series?
No. The ISR 4400 series uses NIM (Network Interface Modules), which are physically and electrically different from the older EHWIC modules used in the 1900, 2900, and 3900 series.
Q3. How do I upgrade the throughput to 2 Gbps?
The upgrade is strictly a software license activation (FL-4450-PERF-K9). Once the license is applied, the aggregate throughput is increased from the default 1 Gbps to 2 Gbps.
Q4. Does this router support Cisco SD-WAN?
Yes. The ISR 4451-X can be upgraded to support Cisco SD-WAN (Viptela or IOS-XE SD-WAN) by installing the appropriate software image and subscription license.
Q5. What type of SFP modules are supported on the combo ports?
The combo ports support standard Gigabit Ethernet SFP transceivers, including GLC-SX-MM-RGD, GLC-LH-SMD, and GLC-TE (Copper).
