Cisco ISR4451-X/K9 4-Port Gigabit Ethernet Integrated Services Router with 3 NIM Slots
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Cisco IOS XE operating system
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1 Gbps default aggregate throughput
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Up to 2 Gbps with Performance License
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Over 4 Gbps CEF-only throughput with Boost License
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2 × Gigabit Ethernet/SFP integrated WAN interfaces
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2 × Gigabit Ethernet interfaces
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Up to 48 switched Ethernet ports with compatible modules
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Optional PoE support
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Redundant internal power-supply support
Cisco ISR4451-X/K9 Integrated Services Router
The Cisco ISR4451-X/K9 is a high-performance enterprise Integrated Services Router designed for demanding branch, WAN, and enterprise networking environments. It combines Gigabit Ethernet connectivity with a modular architecture featuring NIM and service module slots, Cisco IOS XE software, advanced security, and scalable network services.
Enterprise-Class Modular Routing
The Cisco ISR4451-X/K9 provides a flexible platform for organizations that require reliable routing, security, WAN connectivity, and application-aware networking. With 4 onboard Gigabit Ethernet interfaces, 3 Network Interface Module (NIM) slots, 2 Service Module (SM) slots, and an Integrated Service Card (ISC) slot, the router can be customized for a wide range of enterprise deployments.
Its modular design allows organizations to expand network connectivity and services without replacing the complete router platform. The ISR4451-X/K9 supports Cisco IOS XE, providing an operating environment for advanced routing, security, management, and network services.
Key Features
- 4 × onboard Gigabit Ethernet interfaces
- 3 × Network Interface Module (NIM) slots
- 2 × Service Module (SM) slots
- 1 × Integrated Service Card (ISC) slot
- 8 GB Flash memory
- 4 GB control-plane DRAM
- 2 GB data-plane DRAM
- Cisco IOS XE operating system
- 1 Gbps default aggregate throughput
- Up to 2 Gbps with Performance License
- Boost performance of more than 4 Gbps CEF-only
- Optional PoE and switching capabilities
- Hot-swappable/OIR-supported modular architecture
- Redundant internal power supply support
Modular Connectivity and Expansion
Gigabit Ethernet Connectivity
The router provides four onboard Gigabit Ethernet interfaces supporting high-speed LAN and WAN connectivity for enterprise branch and network infrastructure deployments.
Network Interface Modules
Three NIM slots provide modular expansion for additional network interfaces and specialized connectivity options.
Service Module Support
Two SM slots support compatible Cisco service modules, allowing organizations to extend the router's functionality according to deployment requirements.
Integrated Service Card
The integrated service card architecture provides additional options for Cisco network services and processing capabilities.
Scalable Performance
The ISR4451-X/K9 is designed to provide scalable routing performance for enterprise networks. The platform provides a default aggregate throughput of 1 Gbps and can be upgraded to 2 Gbps using the appropriate Performance License. A Boost License can provide performance above 4 Gbps for CEF-only forwarding.
Cisco IOS XE and Enterprise Networking
Cisco IOS XE provides the software foundation for the ISR4451-X/K9. It supports enterprise routing, security, management, and network services while providing a modular software architecture suitable for modern enterprise WAN and branch environments.
The platform can be integrated into enterprise infrastructures where secure routing, centralized management, modular connectivity, and high-performance WAN services are required.
Advanced Network Services
- Enterprise routing and WAN connectivity
- Secure branch-office networking
- VPN and network security capabilities
- Quality of Service support
- Modular network interface expansion
- Application-aware network services
- Centralized network management
- Optional switching and PoE capabilities
Enterprise Deployment Applications
Branch Offices
Suitable for enterprise branch offices requiring secure WAN routing, modular interfaces, and centralized network services.
Enterprise WAN
Designed for organizations requiring scalable WAN connectivity and high-performance routing infrastructure.
Campus Networks
Can serve as a modular routing platform within larger campus and enterprise network architectures.
Network Service Infrastructure
The modular NIM and service-module architecture enables organizations to deploy additional network services as required.
Lifecycle Information
The Cisco ISR4451-X/K9 has reached Cisco's End-of-Sale status.
- End-of-Sale: 7 November 2023
- End-of-Support: 30 November 2028
- Replacement Options: Cisco C8300-2N2S-4T2X and C8300-2N2S-6T
Cisco ISR4451-X/K9 for Enterprise Networking
The Cisco ISR4451-X/K9 combines Gigabit Ethernet connectivity, modular expansion, scalable throughput, Cisco IOS XE, and enterprise networking capabilities in a 2RU platform. Its combination of 4 onboard Gigabit Ethernet interfaces, 3 NIM slots, 2 SM slots, 8 GB Flash, and 4 GB control-plane DRAM makes it suitable for demanding enterprise branch and WAN environments.
Although the ISR4451-X/K9 is an End-of-Sale platform, it remains supported through November 2028. Organizations planning a new deployment should also consider Cisco's listed replacement platforms, including the C8300-2N2S-4T2X and C8300-2N2S-6T.
| Product Name | Cisco ISR4451-X/K9 4-Port Gigabit Ethernet Integrated Services Router with 3 NIM Slots |
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| Weight | 2.170000 |
| CPU | Cisco Multicore Processor |
| Switching Capacity | N/A – Edge Router |
| Memory | 4GB DRAM | 8GB SSD |
| Interface | Gigabit Ethernet / SFP |
| Ethernet | 10/100/1000 Mbps Gigabit Ethernet |
| I/O Port | 4 × GE + 3 × NIM + 2 × SM + 1 × ISC |
| Operating System | Cisco IOS XE |
| Cpu | Cisco Multicore Processor |
| Dimensions | 4.19 × 32.26 × 22.61 cm |
| Manufacturer | Cisco |
| Color | Silver |
| Country of Origin | United States |
Product Datasheet
