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ISR4331-V/K9
100Mbps-300Mbps system throughput, 3 WAN/LAN ports, 2 SFP po...
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ISR4331-V/K9 is a high-performance integrated services router designed for enterprise branch environments. It features a modular architecture with flexible power options, multiple WAN and LAN interfaces, and integrated services supporting voice, video, and WAN optimization, while delivering robust VPN features to secure data traffic.
The router’s design incorporates modular capabilities and redundancy options to ensure high reliability and efficient throughput performance. With support for advanced routing protocols, built-in firewall and intrusion prevention, and scalable expansion modules, this device is ideally suited for enterprise branch offices and remote deployments that demand secure, uninterrupted connectivity.
ISR4331-V/K9 price is $3,564.00, a 52.7% saving from the Cisco list price of $7,528.00. ISR4331-V/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4331-V/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
In a branch office of a financial services firm, the ISR4331-V/K9 delivers up to 300 Mbps of secure SD-WAN connectivity using 3 WAN/LAN ports, 2 SFP ports, a multi-core CPU, and Intelligent WAN. Integrated security (NGFW, IPS), Cisco WAAS acceleration, and AVC optimize encrypted transaction data, while the service module slot supports optional Wi-Fi or hardware encryption and OnePK APIs automate network orchestration. Outcome: sub-10 ms transaction latency, PCI DSS compliance, and 99.999% uptime.
A national retail chain deploys the ISR4331-V/K9 at over 200 stores to unify POS systems, voice communications, and inventory management over bonded broadband links (3 WAN ports) and fiber uplinks (2 SFP ports). The multi-core CPU combined with a service module slot hosts voice DSP and application-level firewall modules, while WAAS and Intelligent WAN prioritize real-time credit card authorizations and VoIP calls. Outcome: 30% faster checkout processing, 24/7 voice support availability, and WAN cost savings of 40%.
Global enterprises leverage the ISR4331-V/K9 to accelerate SaaS and cloud-hosted applications across multi-branch sites by deploying Intelligent WAN, Cisco WAAS, and AVC on a 100–300 Mbps multi-core CPU platform. Integrated VPN and NGFW services secure data in transit, while OnePK APIs enable dynamic SDN-driven bandwidth provisioning. Outcome: 50% improved Office 365 responsiveness, seamless video conferencing, and on-demand network scalability.
To get the detailed certification, please go to the Compliance Center.
 ISR4331-V/K9 |  C1-CISCO4351/K9 |  ISR4221-AX/K9 |  ISR4321-DNA |  ISR4431-DNA | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Fixed | 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 | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | CE / FCC / UL | FCC / CE / UL | FCC / CE / UL | FCC, CE | IEEE / FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | 13.9 inches | 11.5 inches | 12 inches | 15 inches | N/A |
| 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 | EHWIC / NIM / SM-X | EHWIC | EHWIC / NIM | EHWIC | EHWIC / NIM / SFP+ |
| Features | VPN / Voice / Video / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / IPv6 Compatible | VPN / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / VoIP / IPv6 Compatible / MPLS / Integrated Services |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 2 GB | 2 GB | 256 MB | 512 MB | 512 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 4.33 inches | 1.73 inches | 1.75 inches | 1.75 inches | N/A |
| High Availability Support | Supported | Supported | Not 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 / Combo Ports | RJ-45, SFP | RJ-45 / SFP | RJ-45 / SFP |
| 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 | 1 GB | 4 GB | 4 GB |
| Modular Slots Available | 3+ Slots | 2 Slots | 1 Slot | 3+ Slots | 3+ Slots |
| Network Protocols | IPv4 / IPv6 / MPLS | IPv4 / IPv6 | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4, IPv6, MPLS |
| Power | 250 W | 65 Watt | 70 Watt | 200 Watts | 150 W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply / DC Power Supply / Redundant |
| Product Name | Cisco ISR 4331 Integrated Services Router | C1-CISCO4351/K9 | Cisco ISR 4221 Integrated Services Router | ISR4321-DNA | ISR4431-DNA |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | SNMP / CLI / NETCONF | SSH, Telnet, SNMP | Cisco DNA Center, CLI, Web UI | SSH / Telnet / SNMP / NETCONF |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | Yes | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.15 Gbps | 400 Mbps | 0.25 Gbps | 0.3 Gbps | 1.2 Gbps |
| Use Case | Enterprise / Branch | Enterprise | Enterprise / Branch Office | Enterprise / Business | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / DMVPN / FlexVPN | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / GRE / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | Modular WAN |
| Weight | 19 lbs | 14 lbs | 10 lbs | 11 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.4 inches | 17.5 inches | 17.6 inches | 17 inches | N/A |
| Wireless Support | No | No | No | No | No |
Cisco ISR 4331-V delivers 200'400Mbps throughput. Efficient for medium branches requiring voice, UC, and secure WAN connectivity.
Durable and predictable. Handles multiple WAN and LAN ports with smooth performance across endpoints.
Easy to deploy and maintain. Provides stable voice, UC, and network services with minimal downtime.
Reliable Cisco solution. Supports multiple service modules and maintains secure, high-performing UC operations.
Efficient and robust. Ideal for medium offices needing secure, high-throughput routing and UC deployment.
The Cisco ISR4331-V/K9 delivers up to 100 Mbps of default throughput and can scale to 300 Mbps aggregate performance with the Performance on Demand license.
This router includes three integrated Gigabit Ethernet ports that can be configured individually as WAN or LAN interfaces.
The ISR4331-V/K9 provides two built-in SFP slots that support a variety of Cisco fiber and copper transceivers for 1 Gbps uplinks.
It features a multi-core CPU design with dedicated hardware acceleration to run security, voice, WAAS and data services simultaneously.