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ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port

Name: ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port
SKU: ISR4321-V/K9
Price: 2222 USD
Availability: OutOfStock
Rating: 4.8 (22 reviews)

Brand: Cisco
Model: ISR4321-V/K9

Rating:

96%

4.8/5.0

22 Reviews

31 Questions

List Price: $4,676.00

52% OFF

$2,222.00

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ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port

100% Genuine Ready to Ship

$4,676.00

52% OFF

$2,222.00

Overview

End-of-Life Notice

ISR4321-V/K9 is officially EOL. Service support ends on 2028-11-30.

For full lifecycle details, see ISR4321-V/K9 EOL.

Recommended Replacement

Official replacement model. Aligned with current deployment environments.

C8200-1N-4T

Cisco ISR4321-V/K9 Overview

The Cisco ISR4321-V/K9 is a branch-class enterprise router designed to deliver secure WAN connectivity and integrated voice services for small and midsize offices. With aggregate throughput from 50Mbps to 100Mbps and two 10/100/1000 WAN/LAN RJ-45 ports plus one SFP port, it fits converged data and VoIP deployments across Asia, Europe, Africa, and North America. Dual NIM slots with OIR support and 4GB DDR3 ECC DRAM provide flexibility for distributors, SMB integrators, and end users planning scalable, service-rich networks.

Product Highlights

100Mbps

WAN Speed

2 Ports

GE WAN

2 Slots

NIM Flex

Product Components Breakdown

Front Panel of the Product:

LEDs

Represents

Color

Description

POE0

POE PSU

Green

PoE is on and providing power.

Amber

PoE is in a failed condition.

Off

PoE supply is not present.

FLASH

System Flash Status

TEMP

Temperature Status

Amber

One or more temperature sensors in the system are outside the acceptable range.

Off

Temperature is not being monitored.

PWR

System Power

Green

System power is on and functioning correctly.

Rear Panel of the Product:

①

Grounding

⑦

GE 0/0/1 (copper cable) port

②

Power switch

⑧

GE 0/0/0 SFP (fiber-optic) port

③

Power input connector

⑨

NIM slots

④

GE “MGMT” port (with USB port below)

⑩

GE 0/0/0 RJ-45 (copper cable) port

⑥

Console port

Product Applications Scenarios

Enterprise Network

ISR4321-V/K9 aggregates secure WAN links for branch offices, simplifying routing and voice on one platform and helping enterprises cut deployment and management costs by up to 30%.

Service Providers

Service providers can use ISR4321-V/K9 as CPE to terminate VPN and voice bundles, ensuring predictable 50–100Mbps performance while reducing truck-rolls through modular NIM expansion.

Edge & IoT

At remote industrial or retail sites, ISR4321-V/K9 delivers reliable IP routing and voice over dual GE plus SFP uplinks, improving uptime for IoT endpoints and POS systems at the network edge.

Product Features Comparison


Model	ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port	ISR4321/K9, Cisco ISR 4000 Series Router, 50-100Mbps throughput/2 WAN-LAN ports/1 SFP port	ISR4331-V/K9, Cisco ISR4331 Router, 100Mbps-300Mbps throughput/3 WAN-LAN ports/2 SFP ports	C2911-VSEC/K9, Cisco 2911 Router, Voice Sec. Bundle, PVDM3-16, UC/SEC License
Brand	Cisco	Cisco	Cisco	Cisco
Routing Throughput	50Mbps to 100Mbps (Aggregate Throughput)	50Mbps - 100Mbps (System Throughput)	100Mbps to 300Mbps (Aggregate Throughput)	n/a
Interface Configuration	2 Total onboard WAN or LAN 10/100/1000 ports; 2 RJ-45-based ports; 1 SFP-based port	2 WAN/LAN Ports; 1 SFP Port; 1 GE Management Port	3 Total Onboard WAN or LAN 10/100/1000 Ports; 2 RJ-45-based Ports; 2 SFP-based Ports	2 RJ-45 onboard LAN/WAN 10/100/1000 ports; 2 EHWIC slots; 1 Doublewide EHWIC slot
Supported Protocol	n/a	n/a	n/a	Routing Protocol, Data Link Protocol, Network / Transport Protocol (values as per detailed Spec but no exact key “Supported Protocol”)
VPN Capability	n/a	Security, Voice (no explicit “VPN Capability” key)	VPN (IPSec VPN, GRE VPN, DSVPN, L2TP VPN, Smart VPN under AR32-200-AC only, not ISR4331-V/K9) - n/a	Integrated VPN; SSL Support (no exact “VPN Capability” key)
Integrated Features	Cisco ISR4321-V/K9 (2GE, 2NIM, 4G FLASH, 4G DRAM, Voice Bundle)	Security Included; Voice Included; Cisco Cloud Web Security; PoE Support	Cisco ISR4331-V/K9 (2GE, 2NIM, 1SM, 4G FLASH, 4G DRAM, Voice Bundle)	Cisco 2911 Voice Sec. Bundle, PVDM3-16, UC and SEC License PAK

Optional Add-ons

Model Number	Description
ISR4321/K9	Cisco ISR 4321 base router, ideal as a non-voice variant companion for ISR4321-V/K9 deployments.
NIM-2GE-CU-SFP	Cisco 2-port GE combo copper/SFP Network Interface Module for expanding WAN/LAN connectivity on ISR 4000 Series.
SL-4320-VLIC-K9	Cisco voice license for ISR 4320 Series, enabling advanced UC and voice features on ISR4321-V/K9.

Quality Certifications

Specification

Cisco ISR4321-V/K9 Specification

Model

ISR4321-V/K9

Brand

Cisco

Description

Cisco ISR4321-V/K9 (2GE, 2NIM, 4G FLASH, 4G DRAM, Voice Bundle)

Aggregate Throughput

50Mbps to 100Mbps

Total onboard WAN or LAN 10/100/1000 ports

RJ-45-based ports

SFP-based ports

Enhanced service-module slots

Doublewide service-module slots

NIM slots

OIR (all I/O modules)

Yes

Onboard ISC slot

Default DDR3 ECC DRAM (combined control/services/data planes)

4GB

Maximum DDR3 ECC DRAM (combined control/services/data planes)

8GB

Default DDR3 ECC DRAM (data plane)

N/A

Maximum DDR3 ECC DRAM (data plane)

N/A

Default DDR3 ECC DRAM (control/services plane)

N/A

Maximum DDR3 ECC DRAM (control/services plane)

N/A

Default flash memory

4GB

Maximum flash memory

8GB

External USB 2.0 slots (Type-A)

USB console port (Type-B mini, up to 115.2 kbps)

Serial console port (RJ-45, up to 115.2 kbps)

Serial auxiliary port (RJ-45, up to 115.2 kbps)

Power-supply options

External: AC and PoE

Redundant power supply

N/A

AC input voltage

100 to 240 VAC autoranging

AC input frequency

47 to 63 Hz

AC input current range (maximum)

1.5 to 0.6 A

AC input surge current

90 A peak and less than 3 Arms per half cycle

Typical power (no modules)

36W

Maximum power with AC power supply

125W

Maximum power with PoE power supply (platform only)

260W

Maximum endpoint PoE power available from PoE power supply

120W

Weight

9.19 kg

Get more information

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Quality Certifications

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Q&A

Questions & Answers

What accessories are available for the ISR4321-V/K9?

Accessories include additional Network Interface Modules (NIM), rack-mount kits, SFP transceivers, and power supply options.

How does ISR4321-V/K9 compare with the ISR4331?

The ISR4321-V/K9 offers 50Mbps-100Mbps throughput, whereas the ISR4331 offers higher throughput, making the latter suitable for more demanding environments.

What advantages does the ISR4321-V/K9 offer in terms of WAN optimization?

The ISR4321-V/K9 employs WAAS and Intelligent WAN technologies to optimize WAN performance, reduce costs, and ensure high-quality application delivery.

Are the products sold on router-switch.com authentic?

Yes, router-switch.com only sells 100% genuine products from authorized brands. As a multi-brand authorized distributor, all items are sourced through official channels and include valid manufacturer warranties. Customers may verify authorization via brand websites or request certification documents.

Learn More

What is the system throughput of the ISR4321-V/K9?

The ISR4321-V/K9 offers a system throughput of 50Mbps-100Mbps, suitable for branch offices or small to medium-sized businesses.

How many WAN/LAN ports does the ISR4321-V/K9 support?

The ISR4321-V/K9 comes with 2 WAN/LAN ports, providing flexibility for different network configurations.

Does the ISR4321-V/K9 support SFP ports?

Yes, the ISR4321-V/K9 features 1 SFP port for fiber connectivity, enhancing network performance and reliability.

What type of CPU does the ISR4321-V/K9 use?

The ISR4321-V/K9 is equipped with a multi-core CPU, ensuring efficient processing and superior performance under various loads.

What modules can be added to the ISR4321-V/K9?

The ISR4321-V/K9 supports 2 Network Interface Modules (NIMs), allowing for customizable hardware expansion based on needs.

Is the ISR4321-V/K9 cost-effective for small to medium-sized businesses?

Yes, with its voice bundle, Intelligent WAN, and WAAS features, the ISR4321-V/K9 provides a cost-effective solution for comprehensive network needs.

Can the ISR4321-V/K9 be used for voice applications?

Absolutely, the ISR4321-V/K9 is designed with a Voice Bundle that supports a variety of voice applications for integrated communications.

Does the ISR4321-V/K9 need frequent upgrades?

Cisco regularly updates firmware for products like the ISR4321-V/K9, ensuring security and enhanced features. Users should keep the firmware current for optimal performance.

Are there any alternative products to the ISR4321-V/K9?

Alternatives to the ISR4321-V/K9 in the Cisco ISR series include ISR4331 and ISR4351 models, which offer different performance levels and port options.

What are some common troubleshooting steps for the ISR4321-V/K9?

Common troubleshooting steps include verifying connections, checking firmware versions, and using Cisco's diagnostic tools to identify and resolve issues quickly.

What is the system throughput of the ISR4321-V/K9?

The ISR4321-V/K9 offers a system throughput of 50Mbps-100Mbps, suitable for branch offices or small to medium-sized businesses.

How many WAN/LAN ports does the ISR4321-V/K9 support?

The ISR4321-V/K9 comes with 2 WAN/LAN ports, providing flexibility for different network configurations.

Does the ISR4321-V/K9 support SFP ports?

Yes, the ISR4321-V/K9 features 1 SFP port for fiber connectivity, enhancing network performance and reliability.

What type of CPU does the ISR4321-V/K9 use?

The ISR4321-V/K9 is equipped with a multi-core CPU, ensuring efficient processing and superior performance under various loads.

What modules can be added to the ISR4321-V/K9?

The ISR4321-V/K9 supports 2 Network Interface Modules (NIMs), allowing for customizable hardware expansion based on needs.

Is the ISR4321-V/K9 cost-effective for small to medium-sized businesses?

Yes, with its voice bundle, Intelligent WAN, and WAAS features, the ISR4321-V/K9 provides a cost-effective solution for comprehensive network needs.

Can the ISR4321-V/K9 be used for voice applications?

Absolutely, the ISR4321-V/K9 is designed with a Voice Bundle that supports a variety of voice applications for integrated communications.

Does the ISR4321-V/K9 need frequent upgrades?

Cisco regularly updates firmware for products like the ISR4321-V/K9, ensuring security and enhanced features. Users should keep the firmware current for optimal performance.

Are there any alternative products to the ISR4321-V/K9?

Alternatives to the ISR4321-V/K9 in the Cisco ISR series include ISR4331 and ISR4351 models, which offer different performance levels and port options.

What are some common troubleshooting steps for the ISR4321-V/K9?

Common troubleshooting steps include verifying connections, checking firmware versions, and using Cisco's diagnostic tools to identify and resolve issues quickly.

How cost-effective is the ISR4321-V/K9 for small to medium-sized businesses?

The ISR4321-V/K9 delivers excellent performance with 50Mbps-100Mbps system throughput and flexible WAN/LAN ports, making it a cost-effective choice for small to medium-sized businesses.

What are the distinctive features of the ISR4321-V/K9 router?

The ISR4321-V/K9 features 2 WAN/LAN ports, 1 SFP port, a multi-core CPU, 2 NIM slots, and includes Voice Bundle, WAAS, Intelligent WAN, OnePK, and AVC functionalities.

What application scenarios are ideal for the ISR4321-V/K9?

The ISR4321-V/K9 is ideal for branch offices and small to medium-sized enterprise deployments requiring robust voice, video, and WAN optimization capabilities.

How do I install the ISR4321-V/K9 router?

Installation involves mounting the router, connecting the WAN/LAN and SFP ports, installing NIM modules as needed, and configuring the software to fit your network requirements.

Does the ISR4321-V/K9 need software upgrades?

Yes, it's recommended to keep the ISR4321-V/K9's IOS software up-to-date for performance improvements and security enhancements.

Are there alternative products to the ISR4321-V/K9?

Alternative products include other routers from the Cisco 4000 ISR series, such as the ISR4331 and ISR4351, which offer different throughput and features.

What common troubleshooting steps are there for the ISR4321-V/K9?

Basic troubleshooting involves checking the physical connections, verifying configuration settings, ensuring the latest IOS is installed, and consulting Cisco's troubleshooting guides.

What accessories are available for the ISR4321-V/K9?

Accessories include additional Network Interface Modules (NIM), rack-mount kits, SFP transceivers, and power supply options.

How does ISR4321-V/K9 compare with the ISR4331?

The ISR4321-V/K9 offers 50Mbps-100Mbps throughput, whereas the ISR4331 offers higher throughput, making the latter suitable for more demanding environments.

What advantages does the ISR4321-V/K9 offer in terms of WAN optimization?

The ISR4321-V/K9 employs WAAS and Intelligent WAN technologies to optimize WAN performance, reduce costs, and ensure high-quality application delivery.

Are the products sold on router-switch.com authentic?

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Model Datasheet

ISR4321-V/K9 Datasheet

ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port

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ISR4321-V/K9, Cisco ISR4321 Router, 100Mbps throughput/2 WAN-LAN ports/1 SFP port

Cisco ISR4321-V/K9 Overview

Product Highlights

Product Components Breakdown

Product Applications Scenarios

Product Features Comparison

Optional Add-ons

Quality Certifications

Cisco ISR4321-V/K9 Specification

Get more information

Quality Certifications

Need Help? Technical Experts Available Now.

Questions & Answers

What accessories are available for the ISR4321-V/K9?

How does ISR4321-V/K9 compare with the ISR4331?

What advantages does the ISR4321-V/K9 offer in terms of WAN optimization?

Are the products sold on router-switch.com authentic?

What is the system throughput of the ISR4321-V/K9?

How many WAN/LAN ports does the ISR4321-V/K9 support?

Does the ISR4321-V/K9 support SFP ports?

What type of CPU does the ISR4321-V/K9 use?

What modules can be added to the ISR4321-V/K9?

Is the ISR4321-V/K9 cost-effective for small to medium-sized businesses?

Can the ISR4321-V/K9 be used for voice applications?

Does the ISR4321-V/K9 need frequent upgrades?

Are there any alternative products to the ISR4321-V/K9?

What are some common troubleshooting steps for the ISR4321-V/K9?

What is the system throughput of the ISR4321-V/K9?

How many WAN/LAN ports does the ISR4321-V/K9 support?

Does the ISR4321-V/K9 support SFP ports?

What type of CPU does the ISR4321-V/K9 use?

What modules can be added to the ISR4321-V/K9?

Is the ISR4321-V/K9 cost-effective for small to medium-sized businesses?

Can the ISR4321-V/K9 be used for voice applications?

Does the ISR4321-V/K9 need frequent upgrades?

Are there any alternative products to the ISR4321-V/K9?

What are some common troubleshooting steps for the ISR4321-V/K9?

How cost-effective is the ISR4321-V/K9 for small to medium-sized businesses?

What are the distinctive features of the ISR4321-V/K9 router?

What application scenarios are ideal for the ISR4321-V/K9?

How do I install the ISR4321-V/K9 router?

Does the ISR4321-V/K9 need software upgrades?

Are there alternative products to the ISR4321-V/K9?

What common troubleshooting steps are there for the ISR4321-V/K9?

What accessories are available for the ISR4321-V/K9?

How does ISR4321-V/K9 compare with the ISR4331?

What advantages does the ISR4321-V/K9 offer in terms of WAN optimization?

Are the products sold on router-switch.com authentic?

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