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ISR4351/K9
200Mbps-400Mbps system throughput, 3 WAN/LAN ports, 3 SFP po...
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ISR4351/K9 is a fixed modular enterprise router engineered with a robust architecture that blends integrated WAN/LAN interfaces with diverse power options including AC and DC with redundancy. It delivers comprehensive integrated services such as voice and video, supports a range of modular capabilities through expansion slots (EHWIC/NIM), and incorporates advanced VPN features including IPSec, SSL VPN, DMVPN, and FlexVPN.
ISR4351/K9 is built for high-performance branch connectivity with dual WAN interfaces and four LAN ports offering Gigabit Ethernet technology. It provides impressive throughput of up to 75 Mbps, redundant power support for high availability, and a suite of security features including firewall, intrusion prevention, and malware protection, making it ideal for enterprise branch deployments and secure site-to-site connections.
ISR4351/K9 price is $1,773.00, a 86.1% saving from the Cisco list price of $12,775.00. ISR4351/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4351/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
In a global retail chain, the Cisco ISR4351/K9’s 200 Mbps–400 Mbps system throughput, 3 WAN/LAN ports and Intelligent WAN (IWAN) aggregate MPLS, broadband and LTE links to deliver high-availability POS and inventory services. Its multi-core CPU and Application Visibility and Control (AVC) dynamically prioritize checkout and ERP traffic, while WAAS modules accelerate cloud-based promotions. Security services and OnePK APIs enforce consistent policy across sites. Outcome: 40% faster transactions, 30% lower WAN costs and 99.9% branch uptime.
A mid-size bank leverages the Cisco ISR4351/K9 with 2 service-module slots populated by voice DSP and security modules, plus 3 SFP fiber ports for redundant data center uplinks. The multi-core CPU sustains simultaneous encryption, voice transcoding and firewall throughput up to 400 Mbps, while AVC and QoS guarantee sub-50 ms call latency. OnePK automation streamlines provisioning and compliance auditing under PCI DSS. Outcome: 99.99% voice uptime, 50% reduction in call drops and robust regulatory compliance.
A regional hospital deploys Cisco ISR4351/K9 routers at its data centers and clinics to support secure EHR access and telemedicine. Utilizing 3 WAN/LAN ports, 3 SFP ports and Intelligent WAN, clinicians gain resilient, low-latency connectivity to SaaS and EMR platforms. WAAS accelerates patient records, service modules enforce next-gen firewall and encryption, and AVC monitors critical medical applications. Outcome: 25% faster EHR response times, full HIPAA compliance and simplified network management through OnePK orchestration.
To get the detailed certification, please go to the Compliance Center.
 ISR4351/K9 |  ISR4221X/K9 |  ISR4451-X-AXV/K9 |  ISR4321-AXV/K9 |  ISR4461-AX/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Modular | Fixed | Fixed |
| 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 / Malware Protection | Firewall, Intrusion Prevention, Malware Protection |
| Compliance Standards | FCC / CE / RoHS | FCC / CE / RoHS | FCC / CE / UL | FCC, CE | FCC, CE, RoHS |
| Connectivity Type | Wired / Ethernet | Wired | Wired | Wired | Wired / Wireless / Ethernet |
| Depth | 18.8 inches | N/A | N/A | 18.3 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | EN 55032 / EN 55024 | FCC C63.10 | CISPR22, FCC Part 15 | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | EHWIC / NIM | EHWIC / NIM | EHWIC / NIM | NIM / EHWIC | EHWIC, NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | Mesh / VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN, Voice, Video, IPv6 Compatible, Firewall, POE, Integrated Services |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 2 GB | 256 MB | 1 GB | 256 MB | 1 GB |
| Form Factor | Rack-mount | Desktop | Rack-mount Chassis | Rack-mount / Desktop | Rack-mount |
| Height | 1.73 inches | N/A | N/A | 1.75 inches | N/A |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 / SFP | RJ-45 / SFP | RJ-45, SFP, Combo Ports |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 4 GB | 512 MB | 4 GB |
| Modular Slots Available | 3+ Slots | 2 Slots | 3+ Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 | IPv4 / IPv6 | IPv4, IPv6 | OSPF, BGP, EIGRP, RIP, Static Routing |
| Power | 60 Watt | 65W | 305 W | 54 W | 350 W |
| Power Source | AC Power Supply / DC Power Supply / Redundant / N/A | AC Power Supply / DC Power Supply / Redundant | Redundant AC Power Supply | AC Power Supply / Redundant | AC Power Supply with Redundant Option |
| Product Name | Cisco ISR 4351-K9 Integrated Services Router | Cisco ISR 4221 Integrated Services Router | Cisco ISR4451-X Integrated Services Router | Cisco ISR4321-AXV/K9 | ISR4461-AX/K9 |
| 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 / SNMP / NetFlow | SSH, Telnet, SNMP | CLI, HTTP, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | UL / cUL | RoHS | RoHS Compliant | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | Yes | Yes | Yes |
| Telecom | N/A | ITU-T | FCC Part 15 | TIA/EIA | N/A |
| Throughput Capacity | 75 Mbps | 300 Mbps | 2 Gbps | 200 Mbps | 1 Gbps |
| Use Case | Enterprise | Business | Enterprise | Enterprise / Branch | Enterprise / Branch Office |
| VPN Support | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 15 lbs | N/A | N/A | 13.2 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | WiFi 6 (802.11ax) |
| Width | 17.3 inches | N/A | N/A | 17.5 inches | N/A |
| Wireless Support | No | No | No | No | Yes |
Cisco ISR 4351 delivers 50'100Mbps throughput reliably. Multi-core CPU ensures smooth voice, UC, and intelligent WAN performance.
Durable and predictable. Handles multiple WAN/LAN ports and endpoints efficiently with strong security support.
Easy to deploy and manage. Maintains consistent network, UC, and voice communications in branch deployments.
Reliable Cisco solution. Provides high-quality routing, secure communications, and UC for small to medium offices.
High-performing and robust. Supports voice, WAN optimization, and secure UC operations efficiently across branches.
The Cisco ISR4351/K9 delivers 200 Mbps of default throughput and can scale up to 400 Mbps with an optional performance license, providing flexible bandwidth for branch deployments.
The ISR4351/K9 includes three integrated 10/100/1000 WAN/LAN ports, allowing simultaneous connectivity to multiple ISPs or internal networks.
The ISR4351/K9 provides three built-in SFP ports that support both 100 Mbps and 1 Gbps fiber modules, enabling high-speed uplink flexibility.
The ISR4351/K9 is driven by a multi-core CPU design that accelerates routing, security and application services without performance bottlenecks.