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Cisco ISR 4451-X delivers 1'2G system throughput. Perfect for large branches with high WAN, UC, and voice demands.
ISR4451-X/K9
1-2G system throughput, 4 WAN/LAN ports, 4 SFP ports, 10 Cor...
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Name:
ISR4451-X/K9
- Description:
- 1-2G system throughput, 4 WAN/LAN ports, 4 SFP ports, 10 Core CPU, Security, Voice, WAAS, Intelligrnt WAN, OnePK, AVC, separate control data and services CPUs
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 660165095060
- Condition:
- Warranty:
- 3
- List Price:
$26,935.00
- Price:
$7,653.0071.6% off
Quantity:
1
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ISR4451-X/K9 Overview
ISR4451-X/K9 is a high-performance, modular enterprise router engineered for branch and campus environments, featuring a robust Cisco IOS XE software architecture that supports advanced integrated services. It delivers flexible power options including redundant AC/DC supplies and offers a balanced mix of WAN and LAN interfaces to support secure, high-speed connectivity along with integrated voice, video, and WAN optimization capabilities.
ISR4451-X/K9 provides comprehensive VPN features, including IPSec, SSL VPN, DMVPN, and FlexVPN, while ensuring high throughput capacity and built-in redundancy for mission-critical applications. Its modular design, dual WAN configuration, and expansive performance profile make it an ideal solution for enterprise use cases that demand reliable connectivity, advanced security, and scalable network management.
ISR4451-X/K9 price is $7,653.00, a 71.6% saving from the Cisco list price of $26,935.00. ISR4451-X/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4451-X/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4451-X/K9 Specifications
- Product Type
- Enterprise Router
- VPN Support
- IPSec / SSL VPN / DMVPN / FlexVPN
- Power Source
- AC Power Supply / DC Power Supply / Redundant
- Routing Protocols
- OSPF / BGP / EIGRP / MPLS / RIP / Static Routing
- Broadband
- N/A
- Architecture
- Modular
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- LAN Ports
- 4 LAN Ports
- Ethernet Technology
- 10/100/1000
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Network Protocols
- IP, IPv6, OSPF, EIGRP, BGP, RIP, MPLS
- Remote Management
- CLI / SNMP / NetConf
- Compliance Standards
- FCC, CE
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN / Voice / Video / Firewall / MPLS / WAN Optimization
- Use Case
- Enterprise
- Management
- Managed
- Form Factor
- Rack-mount
- Integrated Services
- Voice / Video / WAN Optimization
- High Availability Support
- Supported
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- Throughput Capacity
- 2 Gbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Expansion Slots
- NIM / EHWIC
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 4 GB
- Flash Memory
- 2 GB
- Interface Ports
- RJ-45 / SFP
- Power
- 375 W
- Device Type
- Router
- Product Name
- Cisco ISR 4451-X/K9
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
ISR4451-X/K9 Use Case
Global Branch SD-WAN Consolidation with ISR4451-X/K9-1-2G
A multinational retailer deploys the ISR4451-X/K9-1-2G at 150 branch offices to terminate 4 WAN/LAN and 4 SFP fiber uplinks into its cloud ERP and private data center. The 10-core CPU and separate control, data and services processors deliver up to 2 Gbps encrypted site-to-site VPN throughput while Cisco Intelligent WAN and OnePK automate path selection across MPLS, broadband and LTE links. Outcome: Simplified branch infrastructure, 25% lower WAN costs, consistent SLA enforcement and zero downtime during peak promotions.
Secure, High-Density VoIP & Unified Communications
A global call center chain leverages the ISR4451-X/K9-1-2G to consolidate voice gateways, IP PBX trunks and security services onto a single platform. Four WAN/LAN ports provide carrier-agnostic failover while 4 SFP ports deliver fiber diversity. The 10-core CPU plus separate services CPU offload transcoding and advanced voice-security inspections. Integrated AVC and Cisco WAAS ensure HD voice quality and Fax-over-IP acceleration. Outcome: 40% reduction in branch equipment, 30% bandwidth savings and end-to-end TLS/SRTP compliance.
Cloud Backup & Data Acceleration at Data-Center Edge
A financial services firm installs the ISR4451-X/K9-1-2G at its primary data center to handle simultaneous cloud backups, SAN replication and real-time analytics feeds. Four 10 Gbps SFP ports aggregate dark-fiber links, and four WAN/LAN interfaces provide carrier diversity. Cisco WAAS and AVC run on the 10-core CPU to optimize MAPI, CIFS and large-block database transfers over mixed-latency paths. Security features and a dedicated control processor maintain line-rate IPS. Outcome: 10× faster backup windows, 50% fewer network retransmits and guaranteed 99.99% replication SLAs.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 ISR4451-X/K9 |  ISR4461-AX/K9 |  ISR4431-DNA |  ISR4321-V/K9 |  ISR4451-X-V/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Fixed | Modular | Fixed | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE | FCC, CE, RoHS | IEEE / FCC / CE | FCC, CE | FCC / CE / UL |
| Connectivity Type | Wired | Wired / Wireless / Ethernet | Wired | Wired / Ethernet | Ethernet |
| Depth | N/A | N/A | N/A | 16.1 inches | 18 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM / EHWIC | EHWIC, NIM | EHWIC / NIM / SFP+ | EHWIC | NIM |
| Features | VPN / Voice / Video / Firewall / MPLS / WAN Optimization | VPN, Voice, Video, IPv6 Compatible, Firewall, POE, Integrated Services | VPN / Firewall / VoIP / IPv6 Compatible / MPLS / Integrated Services | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 2 GB | 1 GB | 512 MB | 256 MB | 2 GB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | N/A | N/A | N/A | 1.75 inches | 1.75 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization | Voice / Video / WAN Optimization | Voice / Video | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 / SFP | RJ-45, SFP, Combo Ports | RJ-45 / SFP | RJ-45 | RJ-45 / SFP |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 4 GB | 2 GB | 4 GB |
| Modular Slots Available | 2 Slots | 2 Slots | 3+ Slots | 2 Slots | 3+ Slots |
| Network Protocols | IP, IPv6, OSPF, EIGRP, BGP, RIP, MPLS | OSPF, BGP, EIGRP, RIP, Static Routing | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4, IPv6, MPLS |
| Power | 375 W | 350 W | 150 W | 65W | 370W |
| Power Source | AC Power Supply / DC Power Supply / Redundant | AC Power Supply with Redundant Option | AC Power Supply / DC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant |
| Product Name | Cisco ISR 4451-X/K9 | ISR4461-AX/K9 | ISR4431-DNA | Cisco ISR4321 Integrated Services Router | Cisco ISR4451-X-V/K9 |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | CLI / SNMP / NetConf | CLI, HTTP, SNMP | SSH / Telnet / SNMP / NETCONF | SSH, Telnet, SNMP | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing / MPLS |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | Yes | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 2 Gbps | 1 Gbps | 1.2 Gbps | 300 Mbps | 2 Gbps |
| Use Case | Enterprise | Enterprise / Branch Office | Enterprise | Enterprise | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Modular WAN |
| WAN Ports | 2 WAN | 2 WAN | Modular WAN | 2 WAN | Modular WAN |
| Weight | N/A | N/A | N/A | 12.3 lbs | 30 lbs |
| Wi-Fi Standard | N/A | WiFi 6 (802.11ax) | N/A | N/A | N/A |
| Width | N/A | N/A | N/A | 17.3 inches | 17.5 inches |
| Wireless Support | No | Yes | No | No | No |
Reviews & Ratings
S
Sophia Turner
4
Durable and efficient. Multi-core CPU ensures smooth performance for security, voice, WAAS, and intelligent WAN operations.
H
Henry Davis
5
Easy to configure and manage. Handles multiple services with separate control and data CPUs effectively.
O
Olivia Morgan
3
Reliable Cisco solution. Maintains high-performance UC and secure network operations for large office deployments.
L
Lucas Foster
4
High-performing and robust. Supports voice, security, and advanced WAN optimization for enterprise branches efficiently.
Questions & Answers
What is the system throughput of the Cisco ISR4451-X/K9 router?
The Cisco ISR4451-X/K9 delivers 1–2 Gbps of system throughput, supporting high-performance enterprise and branch applications.
How many WAN/LAN and SFP ports does the ISR4451-X/K9 include?
The ISR4451-X/K9 features four integrated Gigabit Ethernet WAN/LAN ports and four SFP ports for flexible fiber connectivity.
What CPU architecture powers the Cisco ISR4451-X/K9?
The ISR4451-X/K9 is powered by a 10-core CPU architecture, delivering advanced performance for routing, security, and unified services.
Does the ISR4451-X/K9 support built-in security features?
Yes, the ISR4451-X/K9 includes integrated security services such as next-gen firewall, VPN, and intrusion prevention to safeguard network traffic.