United States$5,000,000+
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Sophia Miller
5
Cisco ISR 4331 delivers robust performance with 3GE, 2NIM, and 1SM. Ideal for medium branch offices with multiple UC endpoints.
ISR4331/K9
Cisco ISR 4331 (3GE,2NIM,1SM,4G FLASH,4G DRAM,IPB)
FEATURED DEAL
Name:
ISR4331/K9
- Description:
- Cisco ISR 4331 (3GE,2NIM,1SM,4G FLASH,4G DRAM,IPB)
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 818250039295
- Condition:
- Warranty:
- 3
- List Price:
$5,223.00
- Price:
$1,064.0079.6% off
Quantity:
1
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ISR4331/K9 Overview
ISR4331/K9 is a modular, enterprise-class router built on a robust Cisco IOS XE architecture with integrated services that support voice, video, and WAN optimization. It offers flexible power options with support for AC and redundant configurations, dual WAN interfaces paired with modular LAN capabilities, and dedicated VPN features such as IPsec and SSL VPN to ensure secure branch connectivity.
ISR4331/K9 delivers high throughput performance with built-in redundancy for mission-critical applications and supports advanced routing protocols alongside integrated firewall and QoS features. Its design caters to enterprise and branch use cases where a compact, rack‐mount chassis with expansion slots for additional modules meets robust connectivity and security demands.
ISR4331/K9 price is $1,064.00, a 79.6% saving from the Cisco list price of $5,223.00. ISR4331/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4331/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
ISR4331/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
- Modular LAN
- Ethernet Technology
- 10/100/1000
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Network Protocols
- IPv4, IPv6, MPLS
- Remote Management
- Telnet, SSH, SNMP, NETCONF
- Compliance Standards
- FCC, CE, RoHS
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN, IPv6 Compatible, Firewall, Integrated Services
- 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
- 100 Mbps
- 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
- 4 GB
- Flash Memory
- 4 GB
- Interface Ports
- RJ-45, SFP
- Power
- 150W
- Device Type
- Router
- Product Name
- Cisco ISR4331/K9
- Height
- 1.75 inches
- Width
- 17.41 inches
- Depth
- 16.34 inches
- Weight
- 14.3 lbs
ISR4331/K9 Use Case
Enterprise SD-WAN Edge Deployment with Cisco ISR 4331
A global retail chain deploys Cisco ISR 4331 (3GE, 2NIM, 1SM, 4G FLASH, 4G DRAM, IP Base) at 200+ stores to serve as SD-WAN edge routers. Using Cisco vManage to orchestrate dynamic path selection across broadband, MPLS, and LTE links, IT teams achieve granular application steering and zero-touch provisioning. Benefit: Cuts WAN transport costs by 40%, boosts application uptime to 99.99%, and simplifies centralized policy management for rapid branch rollout.
PCI-Compliant VPN Gateway for Financial Services
A mid-size bank leverages Cisco ISR 4331’s IPsec hardware acceleration and IP Base license to secure site-to-site tunnels between headquarters and 50 ATM / branch locations. With DMVPN and 256-bit AES encryption, sensitive transactions are protected end-to-end, meeting stringent PCI DSS and data-privacy regulations. Benefit: Delivers bank-grade encryption, reduces VPN latency by 30%, and sustains 99.95% availability for uninterrupted financial operations.
Unified Branch Networking and VoIP Continuity
A regional healthcare provider consolidates WAN, LAN, security, and voice on Cisco ISR 4331 (3GE, 2NIM, 1SM, 4G FLASH, 4G DRAM, IP Base). Integrated QoS and Survivable Remote Site Telephony (SRST) support 200 concurrent VoIP calls with prioritized traffic, while built-in firewall and WAN optimization secure and accelerate patient data flows. Benefit: Improves call quality by 50%, reduces branch hardware footprint by 30%, and ensures 24/7 clinical communications uptime.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 ISR4331/K9 |  ISR4351-VSEC/K9 |  ISR4461-AXV/K9 |  ISR4451-X-V/K9 |  ISR4461-AX/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Modular | 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 / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall, Intrusion Prevention, Malware Protection |
| Compliance Standards | FCC, CE, RoHS | FCC / CE | FCC / CE / UL | FCC / CE / UL | FCC, CE, RoHS |
| Connectivity Type | Wired | Wired | Wired | Ethernet | Wired / Wireless / Ethernet |
| Depth | 16.34 inches | 18.1 inches | N/A | 18 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 | EHWIC / NIM | EHWIC / NIM | NIM | EHWIC, NIM |
| Features | VPN, IPv6 Compatible, Firewall, Integrated Services | VPN / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / IPv6 Compatible / QoS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN, Voice, Video, IPv6 Compatible, Firewall, POE, Integrated Services |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 4 GB | 512 MB | 1 GB | 2 GB | 1 GB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 inches | 1.73 inches | N/A | 1.75 inches | N/A |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice, Video, WAN Optimization | Voice / Security | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization |
| Interface Ports | RJ-45, SFP | RJ-45 / SFP | RJ-45 / SFP / Combo Ports | RJ-45 / SFP | RJ-45, SFP, Combo Ports |
| LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | Modular LAN | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 4 GB | 4 GB | 4 GB |
| Modular Slots Available | 2 Slots | 2 Slots | 3+ Slots | 3+ Slots | 2 Slots |
| Network Protocols | IPv4, IPv6, MPLS | IPv4 / IPv6 | IPv4 / IPv6 | IPv4, IPv6, MPLS | OSPF, BGP, EIGRP, RIP, Static Routing |
| Power | 150W | 350 W | 370W | 370W | 350 W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply with Redundant Option |
| Product Name | Cisco ISR4331/K9 | Cisco ISR4351-VSEC/K9 | Cisco ISR 4461 Integrated Services Router | Cisco ISR4451-X-V/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 | Telnet, SSH, SNMP, NETCONF | CLI / SNMP / NetConf | SSH / Telnet / SNMP | SSH / Telnet / SNMP | CLI, HTTP, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing / MPLS | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | Yes | No | Yes |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 100 Mbps | 0.15 Gbps | 1 Gbps | 2 Gbps | 1 Gbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise | Enterprise / Branch Office |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN / N/A |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Modular WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | Modular WAN | 2 WAN |
| Weight | 14.3 lbs | 16.5 lbs | N/A | 30 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | WiFi 6 (802.11ax) |
| Width | 17.41 inches | 17.2 inches | N/A | 17.5 inches | N/A |
| Wireless Support | No | No | No | No | Yes |
Reviews & Ratings
E
Ethan Parker
4
Durable and predictable. Handles multiple voice and data endpoints efficiently with reliable IP routing.
I
Isabella Reed
5
Easy to deploy and manage. Provides stable UC, voice, and network operations for branch offices.
M
Mason Gray
3
Reliable Cisco solution. Ensures seamless UC and voice communications across medium branch networks.
E
Emma Collins
4
High-performing and robust. Supports secure voice, UC, and IP routing for medium office deployments.
Questions & Answers
What are the key features of the Cisco ISR 4331 (SKU ISR4331/K9)?
The Cisco ISR 4331 delivers scalable WAN and LAN connectivity with up to 100 Mbps throughput; it includes 3 Gigabit Ethernet ports, 2 NIM slots, 1 SM slot, 4 GB flash, 4 GB DRAM, and an IP Base software license.
Which performance level does the Cisco ISR 4331 support?
The Cisco ISR 4331 supports up to 100 Mbps aggregate throughput in default configuration, expandable to 300 Mbps with Performance-on-Demand licenses.
What modular expansion options are available on the ISR 4331?
The ISR 4331 provides 2 Network Interface Module (NIM) slots and 1 Service Module (SM) slot for flexible WAN, LAN, security, and voice expansion.
How much memory and storage are included in the ISR 4331/K9?
The router ships with 4 GB DRAM and 4 GB onboard flash memory, supporting additional DRAM and flash upgrades for increased application performance and logging.