Please allow ~2-3 weeks to dispatch for quality control. Product images are for illustrative purposes only and may contain AI-generated content; they may not represent the final product you receive. Products are subject to the cosmetic grading policy detailed here.
If you are ordering a device that does not include a Windows 11 licence as standard, please check Microsoft's minimum system requirements to confirm if it can be upgraded later should you wish to do so.
Cisco ISR4451-X/K9 Integrated Services Router - Certified Refurbished
The Cisco ISR4451-X/K9 Integrated Services Router features high-performance multicore processors with emulated Quantum Flow Processor technology, 4GB DDR3 ECC RAM (expandable to 16GB), 8GB flash storage (expandable to 32GB), and 4x 10/100/1000 Ethernet ports with SFP support, delivering enterprise-grade networking performance from 1Gbps to 2Gbps throughput for demanding business environments. This certified refurbished 2RU rack-mountable router provides advanced routing, unified communications, security features, and extensive expansion capabilities through 2x SM-X slots and 3x NIM slots, making it an exceptional solution for high-capacity branch offices and enterprise deployments.
Ideal For Enterprise Applications
The ISR4451-X excels in high-end enterprise branch offices and corporate headend deployments requiring robust throughput between 1-2Gbps. Perfect for organisations implementing unified collaboration systems, this router seamlessly integrates voice, video, and data services whilst supporting advanced security protocols including DMVPN, Flex VPN, and zone-based firewalls. The platform's versatility extends to WAN acceleration, application optimisation, and Application Visibility and Control (AVC), making it suitable for retail point-of-sale networks, financial institutions requiring secure transaction processing, healthcare facilities managing patient data, and distributed enterprises consolidating branch infrastructure.
Key Features and Benefits
- Scalable Performance Architecture: Distributed multicore processing with separate control and data planes ensures consistent performance under heavy workloads, whilst software-based Performance-on-Demand licensing enables throughput upgrades without hardware replacement
- Enterprise-Grade Expansion: Two SM-X slots supporting up to 10Gbps each, three NIM slots with 2Gbps connections, and onboard ISC slot for PVDM4 voice modules provide exceptional flexibility for growing network demands
- Advanced Security Integration: Hardware-based Trust Anchor technology, AES-256 encryption, zone-based firewall capabilities, and comprehensive VPN support protect critical business data across distributed networks
- Unified Communications Ready: Native support for voice and video services through PVDM4 modules, with optional PoE+ capability on 2 front-panel ports delivering up to 30W per port for IP phones and wireless access points
- Intelligent Traffic Management: Network-Based Application Recognition (NBAR), Quality of Service (QoS), Performance Routing, and hierarchical QoS ensure optimal application performance and bandwidth utilisation
- Comprehensive Routing Protocols: Full IPv4/IPv6 support with OSPF, EIGRP, BGP, IS-IS routing protocols plus multicast capabilities for sophisticated network topologies
- Resilient Design: Hot-swappable modules with Online Insertion and Removal (OIR), redundant power supply options, and high-availability features including stateful switchover minimise network downtime
- Modern Network Management: Cisco IOS XE operating system delivers Linux-based modularity with RESTCONF, NETCONF, and YANG model support for automation and SDN integration
Technical Specifications
- Processor: High-performance multicore processors with Quantum Flow Processor (QFP) data plane
- Memory: 4GB DDR3 ECC RAM (control plane), expandable to 16GB; 2GB data plane memory
- Storage: 8GB internal flash memory, expandable to 32GB
- Network Interfaces: 4x 10/100/1000 Ethernet ports (RJ-45 or SFP), 1x dedicated Gigabit management port
- Expansion: 2x SM-X slots, 3x NIM slots, 1x ISC slot for voice modules
- Throughput: 1-2Gbps aggregate (up to 4Gbps with Boost licence)
- Power Consumption: 158W typical (450W maximum with AC supply, no PoE)
- Dimensions: 88.9mm (H) x 438.15mm (W) x 469.9mm (D) - 2 rack units
- Weight: 13.1kg (base configuration with single 450W AC power supply)
- Operating Temperature: 0°C to 40°C (at 0-2,000m altitude)
Operating System: Cisco IOS XE
This router runs Cisco IOS XE, a modern Linux-based operating system offering significant advantages over traditional router platforms. The modular architecture separates system functions into independent processes, enabling multicore processing capabilities and preventing single process failures from affecting the entire system. IOS XE provides superior scalability for large deployments, robust programmability through APIs for network automation, and simplified software updates through individual package upgrades rather than complete system reimaging. The platform supports advanced features including software-defined networking (SDN) integration and intent-based networking through Cisco DNA Centre.
Whilst IOS XE delivers substantial benefits, the increased architectural complexity requires administrators to understand both Linux fundamentals and traditional Cisco IOS concepts. However, the familiar CLI interface ensures experienced network professionals can transition smoothly, and the enhanced automation capabilities ultimately reduce operational complexity in enterprise environments.
Cosmetic Grading Standards
Reboot IT categorises refurbished networking equipment into two grades. Excellent Grade units present in virtually like-new condition with minimal signs of previous use, featuring only very minor scuffing or surface abrasions consistent with light handling. The chassis, ports, and modules show no significant wear, maintaining a near-pristine appearance. Good Grade units are fully functional with signs of normal professional use, potentially including light scratches on the chassis, minor wear around port areas, or small cosmetic marks that do not affect structural integrity or performance. Both grades undergo identical functional testing and meet the same operational standards.
Quality Assurance and Warranty
Every Cisco ISR4451-X/K9 router from Reboot IT undergoes comprehensive testing of all features and functions to verify complete operational integrity. Our technicians meticulously examine each network interface, expansion slot, routing protocol, security feature, and management function against manufacturer specifications. Since 2001, Reboot IT has been an industry expert in refurbishing enterprise networking equipment, utilising cutting-edge diagnostic software and hardware testing platforms to ensure every device meets exacting standards.
All units are Verified Reboot Refurb through our thorough testing process, which includes multipoint inspection, component validation, firmware verification, thermal stress testing, and performance benchmarking. This certified refurbished router includes a comprehensive 1-year warranty provided by Reboot IT, protecting your investment and ensuring peace of mind for your critical network infrastructure.
Why Choose Refurbished Enterprise Networking
Selecting certified refurbished Cisco networking equipment delivers exceptional value without compromising reliability. Enterprise-grade routers from professional environments have typically received regular maintenance throughout their service life and represent proven technology trusted by organisations worldwide. Reboot IT's rigorous refurbishment process restores these devices to optimal working condition, offering substantial cost savings compared to new equipment whilst maintaining the performance and features required for demanding business applications.
Upgrade your network infrastructure with confidence. This certified refurbished Cisco ISR4451-X/K9 provides enterprise-grade performance, extensive expansion capabilities, and comprehensive security features backed by Reboot IT's 1-year warranty and over two decades of refurbishment expertise.
| Manufacturer Warranty | 3 Months |
| Number Of Lan Ports | none |
| Maximum Lan Data Rate | None |
| Item Height | None |
| Custom Bundle | No |
| Network Connectivity | None |
| Item Width | None |
| Condition | A |
| Model | ISR4451-X/K9 V06 |
| Maximum Wireless Data Rate | None |
| Type | Other |
| Network Type | None |
| Network Management Type | None |
| Processor Model | none |
| Supported Wireless Protocols | None |
| Number Of Wan Ports | None |
| Device Connectivity | None |
| Interface | None |
| Connector Type | None |
| Raid Levels | None |
| Item Length | None |
| Brand | Cisco |
| Form Factor | None |
| Product Line | none |
| Bundle Description | None |
Refurbished Computers - Cosmetic Grading Guide
Our supplier's refurbished hardware is typically graded either "Excellent" or "Good", however, some legacy products were graded under a letter grading system (A, B, C). Please find the definitions for each grade below and contact us if you're uncertain of a device's grade.
Used Smartphone / Refurbished Mobile Phones
"Excellent" Grade
Devices in this category appear like new, with very minor wear. Expect light or fine scratches on the screen that are shallow enough not to catch on a fingernail. The edge around the glass is virtually flawless, save for possible light scratching around the power port. The back plate may show light/fine scratches, including on the Apple logo, with any discoloration being minimal.
"Good" Grade
These devices are characterized by being fully tested and functional even if they have body scratches, minor paint chips, or a small hairline crack on the screen. Screens are free from dead pixels but may exhibit slight scratching from moderate use.
Refurbished Desktops, Laptops and Monitors
"Excellent" Grade - Laptops
Reserved for units that show barely any signs of previous use, these laptops may exhibit very minor scuffing or abrasions, associated only with minimal standard use. The keyboards show light wear, and importantly, the screens are pristine, free from any scratches, cracks, chips, dead pixels, dark spots, discoloration, or blemishes.
"Excellent" Grade - Desktops
Desktop PCs in the "Excellent" grade category are free from deep scratches, cracks, paint chips, or any broken/missing pieces, ensuring a sleek and almost-new aesthetic.
"Excellent" Grade - Monitors
"Excellent" grade is reserved for units that show evidence of very little to no previous use. Any wear on an "Excellent" Display, including housing/frame and/or external surfaces (i.e. Frame) is associated with standard minimal use. "Excellent" units may have minor scuffing and / or minor abrasions on plastics with from standard light previous use."Excellent" Displays will feature no scratches, cracks, chips, dead pixels, dark spots, discoloration or blemishes. Units will only feature the standard minimal wear and tear that is associated with a used unit.
"Good" Grade - Laptops
"Good" laptops may feature one or several small dings or dents on covers and / or small paint chips on the surface or small hairline cracks in the bezel. Laptop screens may feature uneven light diffusion in screen and may feature subtle blemishes. "Good" Laptops will not feature cracks screens but may feature slight scratching, dead pixels or white spots on the screen.
"Good" Grade - Desktops
"Good" grade desktops may have light scratches on external body and may feature more excessive unit housing and/or external case wear than "Excellent" units, including wear on case / lid. "Good" PCs may feature one or several small dings or dents on covers and / or small paint chips on the surface.
"Good" Grade - Monitors
Displays in the "Good" grade have been fully tested and are functional but may include scratches on body, small paint chips, minor cracks on body, loose and/or wobbly bases. "Good" Display screens may feature uneven light diffusion in screen and may feature subtle to moderate blemishes. "Good" Displays will not feature cracks on screens but may feature slight scratching on screen surfaces from moderate use or wear, dead pixels or white spots on the screen.
Legacy letter grading
Used Smartphone / Refurbished Mobile Phones
A Grade
- No chips, scratches or cracks on the front glass and housing
- No missing or alternative parts
- No sign of liquid damage
- Battery cannot be swollen
B Grade – Same as A Grade except:
- May have light scuffs but no chips or cracks
- Light scratches on housing or front glass
C-Grade – Same as B Grade except:
- Unlimited long shallow scratches on the front glass
- No chips or cracks on the front glass
- Unlimited scratches, chips/dents on back cover housing and corners
- Minor cracks allowed
- Customized housing and aftermarket covers allowed
Refurbished Desktops, Laptops and Monitors
A-Grade
- Overall excellent to very good cosmetic condition. Some may be pristine, others may have light scratches or minor blemishes
- Laptops may have some shiny areas around the keyboard such as the space bar, touchpad or touchpad buttons
- Keyboard keys will be in excellent condition
- Laptop and monitor screens will be blemish free
- Cosmetic blemishes will not impact the overall functionality or performance of the device
B-Grade
- Will have some cosmetic blemishes that include scratches and/or other imperfections
- Minor scratches and dents on the housing
- Laptops may have shiny keys or shiny surfaces around the keyboard however all characters will be legible
- Laptop and monitors screens will have imperfections such as minor scratches, minor chips and/or white spots. There will be no cracking on the screen
- Have the same warranty as A Grade
- Pricing will be cheaper than A Grade
C-Grade
- Same as B-Grade except may have unlimited scratches/blemishes on the screen
- May have cracks/chips or dents on the housing
- Have the same warranty as A Grade
- Pricing will be cheaper than B Grade
