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by Cisco
Product Line: Cisco Integrated Services Router (ISR)
Product Type: ISR4221K9
Original price $673.00 - Original price $1,004.00
Original price
$673.00 - $1,004.00
Current price $673.00
Title: Used

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Product Description

The ISR4221K9 Cisco integrates with 2 onboard WAN or LAN 10/100/1000 ports, 1 SFP port, and 3 NIM slots, offering versatile connectivity options. It features a default memory of 4 GB DDR3 RAM and supports an aggregate throughput of 35 Mbps, which can be enhanced up to 300 Mbps with a Performance License and further to over 1.2 Gbps with a Boost License. This router operates within a temperature range of 0 °C to 40 °C, requires external AC power supply, and is designed for 1 RU rack mounting, making it suitable for small to medium-sized business applications.

Key Feature for the ISR4221K9

  • What is the default aggregate throughput of the device?
    The default aggregate throughput is 35 Mbps.
  • How many 10/100/1000 ports are available?
    There are 2 total onboard WAN or LAN 10/100/1000 ports.
  • What performance improvement is seen with a Performance License?
    With a Performance License, aggregate throughput increases to 300 Mbps.
  • How many RJ-45 ports does the device have?
    The device includes 2 RJ-45 ports.
  • What is the maximum throughput with a Boost License?
    Aggregate CEF only throughput exceeds 1.2 Gbps with a Boost License.
  • How many SFP ports are available on the device?
    There is 1 SFP port available.
  • Does the device support Onboard In-Service Upgrade (OIR)?
    No, OIR support is not available on this device.
  • What are the memory specifications?
    The device comes with 4 GB DDR3 RAM, which is also the maximum supported memory.
  • What power supply options are available?
    The device uses an external AC power supply only.
  • What are the device's dimensions and operating temperature range?
    The device measures 1.72 x 12.7 x 10 inches and operates between 0 °C to 40 °C.

Product Review

The Cisco ISR4221K9 offers scalable performance, starting with a default aggregate throughput of 35 Mbps, which can be increased to 300 Mbps with a Performance License and over 1.2 Gbps with a Boost License, catering to a wide range of networking demands. However, its hardware is limited to 2 RJ-45 ports, a single SFP port, and no support for Online Insertion and Removal (OIR), which might restrict expansion possibilities and ease of maintenance in dynamic networking environments. Additionally, with only 4 GB of non-upgradable DDR3 RAM and a reliance on external AC power, the ISR4221K9 may face challenges in supporting memory-intensive applications and ensuring power redundancy for critical network operations.


The Cisco ISR4221K9 is a network router designed for small to medium-sized businesses, featuring a range of capabilities to facilitate efficient and secure data transmission across networks. This product stands out due to its scalability and flexibility, accommodating various throughput requirements and connectivity options. The base configuration of the ISR4221K9 offers an aggregate throughput of 35 Mbps, which can be significantly increased with licensing upgrades. With the Performance License, the throughput can be boosted to 300 Mbps, and for even more demanding network environments, the Boost License elevates the aggregate CEF (Cisco Express Forwarding) only throughput to over 1.2 Gbps. Connectivity options are versatile, with the router providing two onboard WAN or LAN 10/100/1000 ports for high-speed internet connections. Additionally, it includes: - Two RJ-45 ports for direct, wired connections to other network devices. - One SFP port for fiber optic connections, offering a secure and fast data transmission option. - Three NIM (Network Interface Module) slots, enhancing the router's functionality by allowing for the addition of various interface cards. The ISR4221K9 does not support OIR (Online Insertion and Removal), meaning any upgrades or maintenance requiring module changes will necessitate powering down the unit. Its memory capacity includes 4 GB of DDR3 RAM, which is the maximum supported, ensuring smooth operation of the installed IOS (Internetwork Operating System) and running processes. For external storage and firmware upgrades, the router is equipped with two USB 2.0 Type A slots. Management and configuration of the device are facilitated through a single serial console port, which doubles as a CON/AUX port, allowing for direct access to the router's command-line interface. The ISR4221K9 is powered by an external AC power supply, accepting an input voltage range from 100 to 240 VAC. With a typical power consumption of 24 W, it is designed to operate efficiently, minimizing operational costs. Physically, the router dimensions are set at 1.72 x 12.7 x 10 inches, making it compact enough to fit in a 1 RU (Rack Unit) space within a standard 19-inch rack. This size and form factor make it an ideal choice for businesses with limited space but needing reliable network infrastructure. The operating temperature range is from 0 °C to 40 °C, ensuring reliability and performance even in varying environmental conditions. In summary, the Cisco ISR4221K9 is a versatile and scalable router that caters to a range of business networking needs. Its upgradeable throughput options, combined with multiple connectivity ports and a compact, efficient design, make it a valuable asset for any small to medium-sized enterprise looking to maintain or enhance its network performance and reliability.


Part NumberISR4221K9
Base Throughput Capacity35 Mbps
Enhanced Throughput with Performance License300 Mbps
Maximum CEF Throughput with Boost LicenseAbove 1.2 Gbps
Total Integrated WAN or LAN Ports (10/100/1000)2
Number of RJ-45 Interfaces2
Number of SFP Interfaces1
Slots for Enhanced Service Modules0
Slots for Doublewide Service Modules0
Network Interface Module Slots3
Online Insertion and Removal (OIR)Not Supported
Internal ISC Slot Count0
Initial Memory Configuration4 GB DDR3
Maximum Supported Memory4 GB DDR3
USB 2.0 Type A Ports2
Mini Type B USB Ports0
Combo Console/AUX Port1
Power Supply TypeExternal AC
Input Voltage Range100 to 240 VAC
Typical Power Consumption24 W
Dimensions (Height x Width x Depth)1.72 x 12.7 x 10 inches
Safe Operating Temperature Range0 to 40 °C
Unit Height for Rack Mount1 RU

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