ISR4321/K9
ISR 4321 with 2 onboard GE, 2 NIM slots, 1 ISC slot, 4 GB Flash Memory default, 4 GB DRAM default
The Cisco ISR4321/K9 is an entry-level, resilient 100Mbps branch router with integrated services, modular interfaces, and performance licensing.
ISR4321/K9 Overview
The Cisco ISR4321/K9 is an entry-level branch office router delivering up to 100Mbps performance. It allows small sites to deploy integrated services like security, unified communications, and application optimization.
The Cisco ISR4321/K9 provides fast Ethernet and gigabit network connections along with modular interface expandability. It runs the Cisco IOS XE modular software, enabling on-demand activation of value-added functions.
With the performance license, the router capacity can be increased from 50Mbps default to 100Mbps maximum. The Cisco ISR4321/K9 secures branch investments with reliability features like hardware stacking, redundant power supply, and WAN interface diversity.
Quick Specifications
| Feature | Description |
|---|---|
| Routing Performance | Up to 100Mbps with performance license |
| WAN Ports | 2x Gigabit Ethernet (up to 2 with SFP) |
| LAN Ports | 2x Gigabit Ethernet |
| Slots | 2 NIM slots, 1 ISC slot |
| Memory | 4GB default, up to 8GB DRAM |
| Power Supply | Single integrated AC/DC or external AC |
| Rack Units | 1RU |
| Software | Modular Cisco IOS XE |
ISR4321/K9 Details and Highlights
- Integrated Services: Supports optimization, security, voice, and cloud connectivity natively.
- Fast Ethernet/Gigabit: Routes up to 100Mbps with license, 50Mbps by default.
- Modular Expandability: Slots for network interface modules and integrated cards.
- Compact Form Factor: 1RU height with integrated interfaces. Wall-mount option.
- Resiliency Features: Hardware stacking, redundant power supply, WAN link diversity.
Comparison to Similar Models
| Feature | ISR 4321 | ISR4331/K9 | ISR4351/K9 |
|---|---|---|---|
| Performance | 100Mbps | 300Mbps | 400Mbps |
| Rack Units | 1RU | 1RU | 2RU |
| Power Supply | Single | Single | Dual |
| NIM Slots | 2 | 2 | 3 |
| SM Slots | 0 | 1 | 2 |
Full Specifications
| Feature | ISR 4321 Specifications |
|---|---|
| Routing Performance | Up to 100Mbps aggregate with license |
| Ports | 2x Gigabit Ethernet, 2x Fast Ethernet |
| Slots | 2 NIM slots, 1 ISC slot |
| Memory | 4GB default, up to 8GB DRAM |
| Power Supply | Single integrated AC/DC or external AC |
| Dimensions | 1.75 x 14.55 x 11.60 in (44.55 x 369.57 x 294.64 mm) |
| Rack Height | 1RU |
| Weight | 7.1 lb (3.22 kg) |
| Software | Cisco IOS XE Software |
| Licensing | IP Base, Performance, Security, AppX, UC |
Supported Modules and Accessories
| Module Type | Supported Options |
|---|---|
| NIMs | T1/E1, Serial, xDSL, Fast Ethernet |
| Accessories | SFPs, power supply, faceplates, rack mounts |
ISR4321/K9 Licensing
The Cisco ISR4321/K9 uses Cisco IOS XE Software with licensing:
- IP Base included by default
- Performance license to double the throughput
- Optional Security, Unified Communications, and AppX licenses
Installation and Deployment
- 1RU form factor for space-constrained sites
- Rack mount or wall mount installation
- Supports Smart Licensing and Cisco DNA Center
- Cisco installation services available
Compliance and Safety
- UL 60950-1 safety certified
- EMC emissions compliance to Class A standards
- Meets NEBS shock and vibration requirements
Warranty and Support
- 90 day limited hardware warranty
- IOS software warranty with Cisco support contracts
- 24×7 technical support available through Cisco SMARTnet
ISR4321/K9 End of Life Policy
- Minimum 6 months’ notice for hardware end-of-life
- Minimum 12 months’ notice for software end-of-support
- More details at Cisco EOL Policy
Brand
Cisco Systems
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