ISR4331-SEC/K9
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Cisco ISR4321-VSEC/K9 Integrated Services Router

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ISR4321-VSEC/K9 Overview

Cisco 4321 Integrated Services router is design to deliver advanced services to the small enterprise branch environment. It delivers 50Mbps thoughtput by default.

ISR4321-VSEC/K9 is the Cisco ISR 4321 router with Bundle w/UC & SEC License, and CUBE-10.

Product Code

ISR4321-VSEC/K9
Aggregate Throughput 50 Mbps to 100 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 1
Memory 4 GB (default) / 8 GB (maximum)
Flash Memory 4 GB (default) / 8 GB (maximum)
Power-supply options External: AC and PoE
Rack height 1 RU
Dimensions (H x W x D) 44.55 x 369.57 x 294.64 mm
Package Weight 9.19 Kg
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Description Cisco ISR 4321 Bundle w/UC & SEC License. CUBE-10 Aggregate Throughput 50 Mbps to 100 Mbps Total onboard WAN or LAN 10/100/1000 ports 2 RJ-45-based ports 2 SFP-based ports 1 Enhanced service-module slots 0 Doublewide service-module slots 0 NIM slots 2 OIR (all I/O modules) Yes Onboard ISC slot 1 Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) 4 GB Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) 8 GB Default memory DDR3 ECC DRAM (data plane) NA Maximum memory DDR3 ECC DRAM (data plane) NA Default memory DDR3 ECC DRAM (control/services plane) NA Maximum memory DDR3 ECC DRAM (control/services plane) NA Default flash memory 4 GB Maximum flash memory 8 GB External USB 2.0 slots (type A) 1 USB console port -type B mini (up to 115.2 kbps) 1 Serial console port - RJ45 (up to 115.2 kbps) 1 Serial auxiliary port - RJ45 (up to 115.2 kbps) 1 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, AC power supply (maximum) 1.5 to 0.6A AC input surge current 90 A peak and less than 3 Arms per half cycle Typical power (no modules) (watts) 36 Maximum power with AC power supply (watts) 125 Maximum power with PoE power supply (platform only) (watts) 260 Maximum endpoint PoE power available from PoE power supply (watts) 120

Frequently Asked Questions

What is ISR4321-VSEC/K9

The ISR4321-VSEC/K9 is a Cisco 4000 Series Integrated Services Router bundle that includes Voice (UC) + Security (SEC) licensing together with CUBE support. It is designed for small enterprise branch offices needing secure WAN routing plus unified communications on a single platform.

What does “VSEC” mean in ISR4321-VSEC/K9?

“VSEC” stands for Voice + Security bundle, meaning the router combines: Voice / Unified Communications (UC) features Security licensing (SEC) CUBE functionality (Cisco Unified Border Element) This bundle is highly searched because it simplifies branch deployments requiring both secure networking and VoIP services.

What is ISR4321-VSEC/K9 mainly used for?

This model is commonly used for: Secure enterprise branch WAN routing VoIP and unified communications VPN branch connectivity Voice gateway deployments Small office hybrid networking It is ideal for organizations that want voice + data + security in one router.

What is the throughput of Cisco ISR4321-VSEC/K9?

The ISR4321-VSEC/K9 supports 50 Mbps default throughput, upgradeable up to 100 Mbps, depending on licensing and configuration. This makes it suitable for small-to-medium branch environments.

What ports and expansion options are available?

Typical interfaces include: 2 × Gigabit Ethernet RJ-45 ports 1 × SFP port 2 × NIM expansion slots 1 × onboard ISC slot Its modular architecture allows expansion for voice or WAN modules as needed.

Does ISR4321-VSEC/K9 support VoIP and unified communications?

Yes. The VSEC bundle includes unified communications features such as: Voice gateway functionality SRTP encrypted voice streams SIP / H.323 protocol support SRST failover support This makes it a popular choice for enterprise branch telephony deployments.

Does ISR4321-VSEC/K9 include security features?

Yes. Security licensing enables enterprise protection features, including: IPsec VPN encryption Secure WAN connectivity Authentication and encryption algorithms Secure signaling for voice sessions These features allow safe voice and data transport across branch networks.

Is ISR4321-VSEC/K9 SD-WAN ready?

Yes. The ISR4321 platform runs Cisco IOS XE and can be deployed in SD-WAN environments, allowing centralized routing policies and application-aware WAN optimization — a common reason enterprises still search for this model

Is Cisco ISR4321-VSEC/K9 still supported?

Yes, but the platform is in a lifecycle transition: End-of-Sale: Nov 7, 2023 End-of-Support: Nov 30, 2028 Lifecycle information is one of the most searched topics for ISR 4000 models when companies plan upgrades.

What is the difference between ISR4321-VSEC/K9 and ISR4321-V/K9?

Main difference: ISR4321-V/K9 → Voice bundle only ISR4321-VSEC/K9 → Voice + Security bundle (UC + SEC + CUBE) Organizations choose the VSEC version when both communication and security are required.

Which industries commonly use ISR4321-VSEC/K9?

This router is widely deployed in industries that require secure branch networking with voice communication: Banking & Financial Services Healthcare & Medical Clinics Enterprise Corporate Offices Retail Chains & Multi-branch Businesses Education & Universities Manufacturing & Logistics Government & Public Sector These industries rely on secure WAN + voice integration.

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