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ISR4451-X-AX/K9
1Gbps-2Gbps system throughput, 4 WAN/LAN ports, 4 SFP ports,...
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ISR4451-X-AX/K9 is a high-performance, modular enterprise router that delivers advanced integrated services with redundant power options and dual WAN connectivity combined with four built-in LAN interfaces. Designed for robust branch connectivity, it incorporates a comprehensive set of VPN features, stateful firewall capabilities, and integrated voice/video services to secure and optimize communication in mission-critical environments.
Engineered for demanding use cases, this router supports a wide range of routing protocols including OSPF, BGP, EIGRP, and RIP while providing up to 2 Gbps throughput. Its modular architecture, multiple expansion slots, and redundant power configurations ensure superior performance, high availability, and scalable flexibility for enterprise networks, campus branches, and secure remote operations.
ISR4451-X-AX/K9 price is $16,807.00, a 50.7% saving from the Cisco list price of $34,123.00. ISR4451-X-AX/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4451-X-AX/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
A global enterprise deploys the ISR4451-X-AX router to deliver 1–2 Gbps system throughput across four WAN/LAN and four SFP fiber ports, backed by dual-power modules and separate control, data and services CPUs. Integrated Security, Voice, WAAS, Intelligent WAN, OnePK and AVC ensure encrypted VPN failover, application acceleration and programmability, driving 99.99% uptime and optimal performance for mission-critical applications.
A national retail chain leverages the ISR4451-X-AX at 1–2 Gbps throughput with four WAN/LAN ports, four SFP uplinks and multi-core CPU to connect POS systems and IP phones. Cisco WAAS accelerates inventory and checkout apps while built-in Security, Voice, AVC and Intelligent WAN deliver low-latency voice quality, PCI DSS compliance and a seamless customer shopping experience.
An MSP uses the ISR4451-X-AX with 1–2 Gbps throughput, four WAN/LAN ports, four SFP ports, multi-core processing and separate control/data/service CPUs to host secure VPNs for multiple tenants. Intelligent WAN, OnePK programmability, AVC and Cisco Security automate QoS, granular traffic steering and threat protection, enabling scalable service delivery and SLA assurance for each customer.
To get the detailed certification, please go to the Compliance Center.
 ISR4451-X-AX/K9 |  ISR4431/K9 |  ISR4351/K9 |  ISR4321-DNA |  ISR4221X/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE | FCC, CE, RoHS | FCC / CE / RoHS | FCC, CE | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired | Wired / Ethernet | Wired | Wired |
| Depth | 16.90 inches | 16.3 inches | 18.8 inches | 15 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC / CE | FCC | N/A | N/A | EN 55032 / EN 55024 |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | EHWIC / NIM | NIM / EHWIC / SFP+ | EHWIC / NIM | EHWIC | EHWIC / NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall / MPLS / Syslog | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 512 MB | 512 MB | 2 GB | 512 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Desktop |
| Height | 1.75 inches | 1.73 inches | 1.73 inches | 1.75 inches | N/A |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video | Voice / Video / WAN Optimization | Voice / Video | Voice / Video | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 / SFP | RJ-45 / SFP+ | RJ-45 | RJ-45 / SFP | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 4 GB | 4 GB | 4 GB |
| Modular Slots Available | 3 Slots | 2 Slots | 3+ Slots | 3+ Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 / MPLS | IPv4, IPv6 | IPv4 / IPv6 | IPv4, IPv6 | IPv4 / IPv6 |
| Power | 350W | 275 W | 60 Watt | 200 Watts | 65W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant / N/A | AC Power Supply | AC Power Supply / DC Power Supply / Redundant |
| Product Name | Cisco ISR4451-X-AX/K9 | Cisco ISR 4431 Integrated Services Router (K9) | Cisco ISR 4351-K9 Integrated Services Router | ISR4321-DNA | Cisco ISR 4221 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Cisco IOS XE CLI / SNMP / NetConf | CLI / SNMP / NETCONF / RESTCONF | SSH / Telnet / SNMP | Cisco DNA Center, CLI, Web UI | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | UL / CSA | UL | N/A | N/A | UL / cUL |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | ITU-T |
| Throughput Capacity | 2 Gbps | 0.2 Gbps | 75 Mbps | 0.3 Gbps | 300 Mbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise / Business | Business |
| VPN Support | IPSec / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 17.6 lbs | 31 lbs | 15 lbs | 11 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.32 inches | 17.2 inches | 17.3 inches | 17 inches | N/A |
| Wireless Support | No | No | No | No | No |
High throughput routing with advanced features enabled. Performs consistently in production.
Strong processing power and reliable uptime. Suitable for demanding enterprise networks.
Cisco ISR quality shows here. Handles security and WAN workloads smoothly.
Scalable platform with predictable performance. Easy to integrate into existing infrastructure.
Excellent choice for high performance WAN edge deployments.
The Cisco ISR4451-X-AX/K9 delivers 1 Gbps to 2 Gbps of aggregate system throughput, ensuring high-performance WAN and LAN data processing for demanding branch networks.
The ISR4451-X-AX/K9 features four integrated Gigabit Ethernet ports that can be configured as WAN or LAN interfaces to flexibly address branch connectivity needs.
Yes, it includes four Gigabit SFP ports, enabling seamless integration with fiber or copper-based SFP transceivers for extended reach and high-speed uplinks.
The ISR4451-X-AX/K9 is driven by a multi-core Intel CPU design that separates control, data, and services processing for optimized performance under mixed workloads.