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Cisco ISR4451-X/K9 Refurbished Router WhaleyComm
Cisco

Cisco ISR4451-X/K9 Refurbished - Integrated Services Router

MPN: ISR4451-X/K9
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$229.00
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25+
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Tested

Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.

Tested to factory specification. Backed by 25 years of enterprise trust.

The Cisco ISR4451-X/K9 is a flagship member of the Cisco 4000 Series Integrated Services Router platform, purpose-built for demanding enterprise branch environments that require high throughput, service integration, and network security in a single chassis.

This Refurbished unit has been inspected and tested to ensure it meets operational standards, making it an excellent choice for organizations seeking enterprise-grade networking infrastructure without the cost of new hardware. The ISR4451-X supports aggregated throughput of up to 2 Gbps and features a multi-core CPU architecture that enables simultaneous routing, security, and application services without performance degradation.

Equipped with four onboard GigabitEthernet WAN/LAN ports, two Service Module (SM) slots, four Network Interface Module (NIM) slots, and one Enhanced Service Module (SM-X) slot, the ISR4451-X offers extensive modularity for custom network deployments. It runs Cisco IOS XE Software, providing access to advanced features such as Zone-Based Firewall, IPsec VPN, DMVPN, MPLS, and QoS policies.

The platform also supports Cisco DNA Software licensing tiers, enabling SD-WAN functionality via Cisco vManage when upgraded. Whether consolidating branch WAN services, extending secure VPN connectivity, or aggregating multi-site traffic, the ISR4451-X/K9 delivers the scalability and reliability enterprise networks demand.

Technical Specifications
{'Model'
'ISR4451-X/K9', 'Brand': 'Cisco', 'Series': 'Cisco 4000 Series ISR', 'Condition': 'Refurbished', 'Form Factor': '1U Rack-Mountable', 'Onboard GigabitEthernet Ports': '4', 'NIM Slots': '4', 'SM/SM-X Slots': '2 SM + 1 SM-X', 'Aggregated Throughput': 'Up to 2 Gbps', 'USB Ports': '2 x USB 2.0, 1 x USB Console', 'Management Port': '1 x RJ-45 Console, 1 x RJ-45 Aux', 'Operating System': 'Cisco IOS XE', 'Power Supply': 'AC Internal Power Supply', 'Rack Units': '1U'}
Ideal Use Cases
Enterprise Branch WAN Aggregation
The ISR4451-X/K9 is well-suited for consolidating WAN uplinks at large branch offices requiring high throughput and redundant connectivity. Its modular NIM and SM slots allow organizations to add T1/E1, DSL, or fiber interfaces as needed.
Secure Site-to-Site VPN Connectivity
Organizations requiring encrypted tunnels between headquarters and remote sites benefit from the ISR4451-X's robust IPsec VPN and DMVPN support. The integrated hardware acceleration helps maintain throughput even under heavy encryption workloads.
SD-WAN Migration Platform
The ISR4451-X/K9 supports Cisco's SD-WAN software stack, making it an ideal on-ramp for enterprises planning a phased migration from traditional WAN to software-defined networking. Existing hardware investments are preserved while gaining centralized orchestration capabilities.
What's Included
✔ Cisco ISR4451-X/K9 Router Unit
✔ AC Power Cable
✔ Rack-Mount Kit
✔ 90-Day WhaleyComm Refurbished Hardware Warranty
⚠ Note: SFP modules, NIM modules, and SM modules are NOT included unless explicitly listed. Cisco software licenses and SmartNet support contracts are not included and must be sourced separately.
Lifetime Warranty - No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. 25 years, 5,000+ customers.
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Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
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Software Compatibility: Cisco IOS XE Software (multiple release trains supported); Cisco DNA Software (Essentials, Advantage, Premier licensing tiers); Cisco SD-WAN (vManage/vSmart/vBond when applicable license is applied).

Module Compatibility: Compatible with Cisco NIM (Network Interface Modules), SM (Service Modules), and SM-X (Enhanced Service Modules) from the ISR 4000 Series accessory ecosystem. Compatible SFP and SFP+ transceivers for onboard GE ports follow Cisco's approved transceiver list.

Management Integration: Supported by Cisco DNA Center, Cisco Prime Infrastructure, and SNMP-based NMS platforms. Compatible with Cisco Catalyst Center for enterprises running unified management environments.

Licensing: Requires valid Cisco software licenses for advanced feature sets including Security, Voice, and SD-WAN. Existing PAK or Smart Licensing accounts may be used; verify entitlement with your Cisco account team or reseller prior to deployment.

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Shipping
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Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
Yes, the ISR4451-X/K9 supports Cisco SD-WAN functionality when the appropriate Cisco DNA or SD-WAN software license is applied. It can be managed through Cisco vManage as part of a broader SD-WAN overlay architecture.
This Refurbished ISR4451-X/K9 includes the router chassis, AC power cable, rack-mount kit, and a 90-day WhaleyComm hardware warranty. NIM/SM expansion modules, SFP transceivers, and Cisco software licenses are not included and must be purchased separately.
Basic routing functionality is available with the default IOS XE image; however, advanced features such as Security, Voice, and SD-WAN require additional Cisco software licenses. Buyers should confirm existing license entitlements or budget for new licenses prior to deployment.
The Cisco ISR4451-X/K9 supports aggregated throughput of up to 2 Gbps, making it suitable for high-demand enterprise branch environments with multiple concurrent WAN and LAN services running simultaneously.
Cisco ISR4451-X/K9 Refurbished - Integrated Services Router
$229.00
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