United States$5,000,000+
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L
Lawrence King
5
Strong security throughput and reliable performance. Ideal for enterprise branches.
ISR4351-SEC/K9
200Mbps-400Mbps system throughput, 3 WAN/LAN ports, 3 SFP po...
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Name:
ISR4351-SEC/K9
- Description:
- 200Mbps-400Mbps system throughput, 3 WAN/LAN ports, 3 SFP ports, multi-Core CPU,2 service module slots, Security, VPN, WAAS, Intelligrnt WAN, OnePK, AVC
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 98378689927
- Condition:
- Warranty:
- 3
- List Price:
$14,195.00
- Price:
$6,349.0055.3% off
Quantity:
1
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ISR4351-SEC/K9 Overview
ISR4351-SEC/K9 is a high-performance branch router engineered with a modular architecture that integrates advanced security and unified communications services. Designed for enterprise and business use cases, it offers multiple power options including AC with redundancy, robust WAN/LAN interfaces featuring dual WAN and four LAN ports, and built-in VPN capabilities with IPSec, SSL VPN, DMVPN, and FlexVPN support to securely connect distributed networks.
ISR4351-SEC/K9 delivers excellent throughput capacity with gigabit Ethernet performance, ensuring reliable connectivity and low latency for mission-critical applications. It includes integrated services such as voice, video, and WAN optimization; supports high availability through redundant power supply; and provides flexible expansion with two modular slots for additional interface modules, making it an ideal choice for secure branch connectivity and enterprise deployments.
ISR4351-SEC/K9 price is $6,349.00, a 55.3% saving from the Cisco list price of $14,195.00. ISR4351-SEC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4351-SEC/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4351-SEC/K9 Specifications
- Product Type
- Enterprise Router
- VPN Support
- IPSec / SSL VPN / DMVPN / FlexVPN
- Power Source
- AC Power Supply / Redundant
- Routing Protocols
- OSPF / BGP / EIGRP / 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
- IPv4 / IPv6
- Remote Management
- SSH / Telnet / SNMP
- Compliance Standards
- FCC / CE
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN / IPv6 Compatible / Firewall / Integrated Security
- Use Case
- Enterprise / Business
- 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
- 0.075 Gbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall / Intrusion Prevention / Malware Protection
- Expansion Slots
- EHWIC / NIM
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 1 GB
- Flash Memory
- 256 MB
- Interface Ports
- RJ-45 / SFP
- Power
- 150 W
- Device Type
- Router
- Product Name
- Cisco ISR4351 Integrated Services Router with Enhanced Security (ISR4351-SEC/K9)
- Height
- 1.73 inches
- Width
- 17 inches
- Depth
- 15 inches
- Weight
- 14 lbs
ISR4351-SEC/K9 Use Case
High-Performance SD-WAN Deployment for Multi-Branch Retail Networks
Retail enterprises deploy the Cisco ISR4351-SEC/K9 to harness 200 Mbps–400 Mbps system throughput across 3 WAN/LAN ports and 3 SFP ports with Intelligent WAN and AVC for dynamic path selection over MPLS, broadband and 4G links. The multi-core CPU and 2 service-module slots host integrated Security, VPN and WAAS to secure and accelerate point-of-sale, inventory and POS applications. Benefit: Delivers up to 50% lower transport costs, 30% faster application response times and consistent SLA adherence at every branch.
Secure Data Center Aggregation and Interconnect Gateway
Global data centers rely on the ISR4351-SEC/K9 as a consolidation point using its multi-core CPU, 3 SFP fiber uplinks and dual service-module slots loaded with advanced firewall and WAAS modules. Integrated Security, Site-to-Site VPN and AVC provide encrypted data replication and application-aware traffic shaping at 200 Mbps–400 Mbps. Benefit: Ensures end-to-end data protection, boosts replication efficiency by 25% and simplifies orchestration via Cisco OnePK programmability.
Unified Communications and Remote Workforce Hub
Corporate branches and telework hubs leverage the ISR4351-SEC/K9 to support secure VPN access for 500+ users, multimode voice/video via AVC and intelligent link failover across its 3 WAN/LAN ports. Cisco WAAS accelerates large file transfers, while Intelligent WAN automates QoS policies. The multi-core CPU and service-module slots enable OnePK-driven custom network services. Benefit: Delivers 40% lower VoIP/video latency, seamless UC experiences and rapid, secure remote-site deployment.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 ISR4351-SEC/K9 |  ISR4221-SEC/K9 |  ISR4461-AX/K9 |  C1-CISCO4451/K9 |  ISR4351/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Fixed | Fixed | Modular | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE | IEEE 802.3, FCC, CE | FCC, CE, RoHS | FCC, CE | FCC / CE / RoHS |
| Connectivity Type | Wired | Wired | Wired / Wireless / Ethernet | Wired | Wired / Ethernet |
| Depth | 15 inches | 11.3 inches | N/A | 18 inches | 18.8 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | CISPR 22 | 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 | EHWIC / NIM | EHWIC | EHWIC, NIM | EHWIC / NIM | EHWIC / NIM |
| Features | VPN / IPv6 Compatible / Firewall / Integrated Security | VPN / IPv6 Compatible / Firewall | VPN, Voice, Video, IPv6 Compatible, Firewall, POE, Integrated Services | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 1 GB | 1 GB | 2 GB | 2 GB |
| Form Factor | Rack-mount | Desktop | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.73 inches | 1.73 inches | N/A | 1.75 inches | 1.73 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice / Video | Voice, Video, WAN Optimization | Voice, Video, WAN Optimization | Voice / Video |
| Interface Ports | RJ-45 / SFP | RJ-45 | RJ-45, SFP, Combo Ports | RJ-45, SFP, Combo Ports | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 1 GB | 1 GB | 4 GB | 4 GB | 4 GB |
| Modular Slots Available | 2 Slots | 1 Slot | 2 Slots | 3+ Slots | 3+ Slots |
| Network Protocols | IPv4 / IPv6 | IPv4, IPv6 | OSPF, BGP, EIGRP, RIP, Static Routing | IPv4, IPv6 | IPv4 / IPv6 |
| Power | 150 W | 65W | 350 W | 250 W | 60 Watt |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply with Redundant Option | AC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant / N/A |
| Product Name | Cisco ISR4351 Integrated Services Router with Enhanced Security (ISR4351-SEC/K9) | Cisco ISR 4221-SEC/K9 | ISR4461-AX/K9 | Cisco 4451 Integrated Services Router | Cisco ISR 4351-K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | SSH, Telnet, SNMP | CLI, HTTP, SNMP | CLI, SNMP, Telnet, SSH | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing / MPLS | 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 |
| Safety | N/A | UL, cUL | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | Yes | No | No |
| Telecom | N/A | FCC Part 15 | N/A | N/A | N/A |
| Throughput Capacity | 0.075 Gbps | 300 Mbps | 1 Gbps | 2 Gbps | 75 Mbps |
| Use Case | Enterprise / Business | Enterprise | Enterprise / Branch Office | Enterprise | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | Modular WAN | 2 WAN |
| Weight | 14 lbs | 8.6 lbs | N/A | 23 lbs | 15 lbs |
| Wi-Fi Standard | N/A | N/A | WiFi 6 (802.11ax) | N/A | N/A |
| Width | 17 inches | 17.2 inches | N/A | 17.5 inches | 17.3 inches |
| Wireless Support | No | No | Yes | No | No |
Reviews & Ratings
B
Bruce Hamilton
4
Handles encrypted traffic efficiently. Stable under load.
A
Anthony Moore
5
Cisco ISR reliability with advanced security. Very satisfied.
G
Graham Lewis
3
Good processing power and consistent uptime.
M
Martin Blake
4
Meets demanding security and routing requirements.
Questions & Answers
What is the sustained throughput of the ISR4351-SEC/K9 router?
The ISR4351-SEC/K9 delivers 200 Mbps of aggregate throughput under standard conditions and can burst up to 400 Mbps for peak performance.
How many WAN and LAN interfaces are available on this router?
This model includes three integrated configurable Gigabit Ethernet ports that can function as WAN or LAN interfaces to support flexible network designs.
Can I connect fiber links to the ISR4351-SEC/K9?
Yes, the router features three SFP ports for optical connectivity, supporting both single-mode and multi-mode fiber modules.
What CPU architecture powers the ISR4351-SEC/K9?
It is equipped with a multi-core CPU that optimizes concurrent tasks, ensuring high performance for security, routing, and WAN acceleration.