United StatesName:
Added to cart 28 times recently
In stock - Ready to Ship
$4,510.00
$2,140.0052.5% off
Quantity:
Business price:
3 Year Extended Warranty
Same-day Shipping
14-Day Money Back Guarantee
Shipping:
Payment:
3 Year Extended Warranty
Same-day Shipping
14-Day Money Back Guarantee
Need Additional Discount on Product?
Request a quote below - Get Exclusive Pricing and Support.
Shipping:
Payment:
ISR4321-SEC/K9
50Mbps-100Mbps system throughput, 2 WAN/LAN ports, 1 SFP por...
TRUSTED, TRIED, PROVEN
Inventory Delivered By
& Verified By
Solutions Powered By
ISR4321-SEC/K9 is a high-performance enterprise router engineered with a fixed modular architecture that seamlessly integrates advanced security, routing, and WAN/LAN capabilities. It provides versatile power options supporting both AC and DC supplies with redundancy, while offering robust VPN features including IPSec, SSL VPN, DMVPN, and FlexVPN to secure branch connectivity.
ISR4321-SEC/K9 delivers reliable throughput performance of up to 300 Mbps and features integrated services such as voice, video, and WAN optimization. With multiple interface ports, built-in firewall and intrusion prevention, modular expansion slots for NIM or EHWIC modules, and dual WAN configurations for load balancing and redundancy, this router is ideally suited for enterprise branch, small business, and distributed office deployments.
ISR4321-SEC/K9 price is $2,140.00, a 52.5% saving from the Cisco list price of $4,510.00. ISR4321-SEC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4321-SEC/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
A global professional services firm deploys the ISR4321-SEC/K9 at its regional offices, combining two broadband WAN links and one fiber SFP port. Integrated Intelligent WAN, AVC, and Security enforce application-aware routing and threat protection, delivering 99.9% uptime and 35% faster ERP access.
A mid-sized legal practice implements the ISR4321-SEC/K9 across satellite offices, leveraging embedded Voice licensing and two NIM slots for analog FXS/FXO modules. The multi-core CPU and one SFP port support secure IP telephony and encrypted VPN tunnels, reducing call costs by 45% and ensuring regulatory compliance.
A nationwide retailer deploys the ISR4321-SEC/K9 in stores to optimize point-of-sale and inventory applications using WAAS and AVC. OnePK and Intelligent WAN deliver real-time traffic analytics and dynamic load balancing over redundant links, boosting transaction throughput by 50% and enhancing customer satisfaction.
To get the detailed certification, please go to the Compliance Center.
 ISR4321-SEC/K9 |  ISR4431-VSEC/K9 |  C1-CISCO4321/K9 |  ISR4351-AXV/K9 |  ISR4431/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | 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 | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE | FCC, CE, UL | FCC / CE | FCC, CE | FCC, CE, RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | N/A | 20 inches | N/A | 16.3 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | FCC, CE | N/A | N/A | FCC |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM, EHWIC | NIM | NIM / EHWIC | EHWIC | NIM / EHWIC / SFP+ |
| Features | VPN, Firewall, IPv6 Compatible | VPN / Firewall / IPS / Intrusion Prevention / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization | VPN, Voice, Video, IPv6 Compatible, Firewall, MPLS, Syslog | VPN / VoIP / IPv6 Compatible / Firewall |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 1 GB | 2 GB | 512 MB | 256 MB | 512 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | N/A | N/A | 1.75 inches | N/A | 1.73 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, WAN Optimization | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45, SFP | RJ-45 / SFP / Combo Ports | RJ-45 / SFP | RJ-45, SFP | RJ-45 / SFP+ |
| LAN Ports | 2 LAN Ports | Modular LAN | Modular LAN | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 2 GB | 4 GB | 1 GB | 1 GB | 4 GB |
| Modular Slots Available | 1 Slot | 3+ Slots | 2 Slots | 1 Slot | 2 Slots |
| Network Protocols | IPv4, IPv6 | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4, IPv6 | IPv4, IPv6 |
| Power | 75W | 350 W | 110 W | 130W | 275 W |
| Power Source | AC Power Supply / DC Power Supply (Redundant) | AC Power Supply / Redundant | AC Power Supply with Redundant Options | AC Power Supply / Redundant | AC Power Supply / DC Power Supply / Redundant |
| Product Name | Cisco ISR4321-SEC/K9 | Cisco ISR4431-VSEC/K9 | Cisco 4321 Integrated Services Router (C1-CISCO4321/K9) | Cisco ISR4351-AXV/K9 Integrated Services Router | Cisco ISR 4431 Integrated Services Router (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, NetConf | SSH / Telnet / SNMP | SSH, Telnet, SNMP | CLI / SNMP / NETCONF / RESTCONF |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing |
| Safety | N/A | UL Listed | N/A | N/A | UL |
| 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 | 300 Mbps | 1 Gbps | 0.15 Gbps | 0.15 Gbps | 0.2 Gbps |
| Use Case | Enterprise, Small Business | Enterprise | Enterprise | Enterprise | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / 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 Ports | Modular WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | N/A | N/A | 14 lbs | N/A | 31 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | N/A | 17.5 inches | N/A | 17.2 inches |
| Wireless Support | No | No | No | No | No |
Cisco ISR 4321-SEC delivers secure routing with multi-core CPU. Ideal for small to medium branches needing reliable voice and UC services.
Durable and reliable. Handles 2 WAN/LAN ports efficiently while maintaining secure communications and UC performance.
Easy to configure and maintain. Provides predictable voice, UC, and secure network operations.
Reliable Cisco solution. Maintains seamless UC, voice, and secure routing across small to medium branch offices.
High-performing and robust. Perfect for offices needing secure, reliable, and efficient UC and voice deployment.
The Cisco ISR4321-SEC/K9 delivers 50–100 Mbps of aggregate system throughput, ideal for small to midsize branch offices requiring scalable performance.
This router features two configurable WAN/LAN Gigabit Ethernet ports plus one SFP port for fiber connectivity, facilitating flexible network designs.
Yes. The ISR4321-SEC/K9 supports two NIM slots for optional network interface modules, enabling customization for voice, security, or specialized WAN services.
It includes integrated next-generation firewall, VPN (IPsec/SSL), intrusion prevention (IPS), and secure boot capabilities to safeguard your branch network.