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ISR4331-AX/K9
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Cisco ISR4221-SEC/K9 Integrated Services Router

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ISR4221-SEC/K9 Overview

ISR4221-SEC/K9 is the Cisco 4221 Integrated Services router is design to deliver advanced services to the small enterprise branch environment. It bundles Security Bundle with Security License.

Quick Specs

Table 1 shows the Quick Specs.

Product Code

Cisco

ISR4221-SEC/K9

Bundle

Cisco ISR 4221 SEC Bundle with SEC lic

Aggregate Throughput

35 Mbps to 75 Mbps

Total onboard WAN or LAN 10/100/1000 ports

2

RJ-45-based ports

2

SFP-based ports

1

NIM (Network Interface Modules) slots

2

Onboard ISC slot

No

Default memory double-data-rate 3 (DDR3) error-correction-code

(ECC) DRAM (Combined control/services/data planes)

4 GB

Flash Memory

8 GB

Power-supply options

External AC only

Rack height

1 RU

Dimensions (H x W x D)

1.72 x 12.7 x 10 in (43.7 x 322.6 x 254 mm)

Weight with AC PS (no modules)

7.1 lb (3.22 kg)

 

Table 2 shows some recommended modules and cards.

Items

Models

Description

Console and Auxillary Cables

CAB-CONSOLE-RJ45

 Cisco CAB-CONSOLE-RJ45 Console Cable 6ft with RJ45 and DB9F

Network Interface Modules

NIM-1MFT-T1/E1

Cisco Fourth-Generation Multiflex Trunk Voice and WAN network interface module

NIM-ES2-4

Cisco 4000 Series Integrated Services Router 4-Port Gigabit Ethernet Switch Module layer 2

NIM-ES2-8

Cisco 4000 Series Integrated Services Router 8-Port Gigabit Ethernet Switch Module NIM

SFPs for On-Board GE Ports

GLC-LH-SMD

Cisco

GLC-LH-SMD 1000BASE-LX/LH SFP transceiver module, MMF/SMF, 1310nm, DOM

GLC-ZX-SMD

Cisco

GLC-ZX-SMD 1000BASE-ZX SFP transceiver module, SMF, 1550nm, DOM

GLC-SX-MMD

Cisco

GLC-SX-MMD 1000BASE-SX SFP transceiver module, MMF, 850nm, DOM

Compare to Similar Items

Table 3 shows the comparison.

Models

ISR4221/K9

ISR4221-SEC/K9

Bundle

N/A

Cisco ISR 4221 SEC Bundle with SEC lic

Aggregate Throughput

35 Mbps to 75 Mbps

35 Mbps to 75 Mbps

Total onboard WAN or

LAN 10/100/1000 ports

2

2

RJ-45-based ports

2

2

SFP-based ports

1

1

NIM slots

2

2

Rack height

1

1

 

Frequently Asked Questions

What is Cisco ISR4221-SEC/K9?

The ISR4221-SEC/K9 is a Cisco 4000 Series Integrated Services Router designed for small enterprise branch offices. It comes bundled with the SEC (Security) license, providing secure WAN routing, VPN capability, and enterprise-grade network protection in a compact branch router platform.

What does “SEC” mean in ISR4221-SEC/K9?

SEC” indicates the router includes Cisco’s Security bundle license, enabling advanced security features such as encrypted VPN connectivity and secure WAN communication. This model is commonly chosen by organizations needing built-in security for branch networking.

What is the throughput of ISR4221-SEC/K9?

The ISR4221-SEC/K9 supports 35 Mbps to 75 Mbps aggregate throughput, making it suitable for small offices, branch locations, and secure WAN links where performance and security must be balanced.

What ports and expansion options are available?

Key hardware features include: 2 × Gigabit RJ-45 WAN/LAN ports 1 × SFP port (fiber connectivity) 2 × NIM module slots for expansion USB and console management interfaces This modular design allows businesses to expand connectivity as needed.

Is ISR4221-SEC/K9 suitable for branch offices?

Yes. Cisco designed the ISR 4221 for small enterprise branch environments, offering secure WAN connectivity, modular upgrades, and centralized network management compatibility for distributed offices.

Can ISR4221-SEC/K9 be upgraded or expanded?

Yes. The router includes 2 NIM slots, allowing installation of modules such as WAN interfaces or additional Ethernet modules, giving flexibility for business growth and specific network requirements.

Is ISR4221-SEC/K9 still supported?

The ISR 4000 Series is widely deployed, but many organizations are now planning migration because newer Catalyst 8000 series routers offer longer lifecycle and higher SD-WAN capabilities. (Buyers often search lifecycle and upgrade paths before purchasing.)

What industries use ISR4221-SEC/K9?

This model is commonly deployed in industries requiring secure branch connectivity: Banking & Financial Services Healthcare Clinics & Medical Offices Enterprise Branch Offices Retail Chains & Franchises Education Institutions Manufacturing & Logistics Government & Public Sector

What is the difference between ISR4221-SEC/K9 and ISR4221/K9?

Main difference: ISR4221/K9 → Base routing model ISR4221-SEC/K9 → Includes Security licensing bundle Businesses choose the SEC variant when secure WAN routing and VPN functionality are required from day one.

What is the replacement or upgrade for ISR4221-SEC/K9?

The common upgrade path is the Cisco Catalyst C8200 Series, which provides: Modern SD-WAN architecture Higher performance scalability Improved cloud application optimization Longer product lifecycle This is a frequent enterprise migration route.

Is ISR4221-SEC/K9 still supported?

The ISR 4000 Series is widely deployed, but many organizations are now planning migration because newer Catalyst 8000 series routers offer longer lifecycle and higher SD-WAN capabilities. (Buyers often search lifecycle and upgrade paths before purchasing.)

Does ISR4221-SEC/K9 support VPN and secure networking?

Yes. With the SEC bundle, the router supports secure VPN deployment and encrypted traffic for branch-to-HQ connectivity, which is one of the most searched deployment scenarios for this model.

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