Cisco ISR4321-V/K9 Integrated Services Router

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ISR4321-V/K9 Overview

Cisco Intergrated Services router

ISR4321-V/K9 Voice Bundle is design to deliver advanced VOIP services to the small enterprise branch environment. Cisco ISR 4321 integrates 2 dual mode Gigabit Ethernet ports and PVDM4 DSP for voice and video services, two network modules, one integrated services card slot, 4GB DDR3 Dream and 4 GB flash memory.Cisco ISR4321 delivers 50Mbps thoughtput by default, with pay-as-you-grow performance, you can increase forwarding capacity to 100Mbps when needed, so the platform performance growth with your business, you only pay for the performance you need. According to security, ISR4321 support most advanced encryption – IPsec, SSL VPN and flex VPN.

Quick Specs

Product Code Cisco

ISR4321-V/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

 

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 Blinking Green Compact flash/eUSB flash is present and currently being accessed.
TEMP Temperature Status Solid green All temperature sensors in the system are within acceptable range.
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.
Green blinking System power is in the process of shutting down.
Amber System power is up, but low level initialization failed.
Amber blinking System power is up, but the system failed to come out of reset.
Off System power is off.
SSD mSATA Slot Status Green SSD mSATA is present and enabled.
Amber Initialized with error.
Off Not present.
ISC ISC Slot Status Green PVDM4 is present and enabled.
Amber Initialized with error.
Off Not present.
FAN Fan Status Green All fans are operating.
Amber One fan has stopped working.
Blinking Amber Two or more fans have stopped working, or the fan tray has been removed.
Off Fans are not being monitored.
STAT System Status Solid green System operating normally.
Blinking amber BIOS/Rommon is booting.
Amber BIOS/Rommon has completed booting, and system is at Rommon prompt or booting platform software.
Off System is not out of reset or BIOS image is not loadable.
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Description Cisco ISR4321-V/K9 (2GE,2NIM,4G FLASH,4G DRAM,Voice Bundle)
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

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.
“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.
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.
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.
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.
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.
Typical hardware includes: 2 × Gigabit Ethernet RJ-45 ports 1 × SFP port 2 × NIM expansion slots 1 × ISC slot USB and console management ports This modular design allows future network expansion and voice module integration
Yes. It supports enterprise encryption features such as: IPsec VPN SSL VPN FlexVPN This makes it suitable for secure branch-to-HQ connectivity and remote office deployments.
Yes. The ISR4321 platform can be used in SD-WAN deployments using Cisco IOS XE, allowing centralized policy management and intelligent WAN routing for distributed offices. (This is a frequent enterprise search topic when modernizing branch networks.)
This model remains popular because: Large installed enterprise base Voice + data in a single device Flexible throughput licensing Reliable Cisco branch platform Many companies continue to upgrade or expand existing ISR 4000 deployments.
Main difference: ISR4321/K9 → Standard routing platform ISR4321-V/K9 → Includes Voice Bundle for unified communications The V version is selected when branch voice or VoIP services are required.
Yes. It is ideal for SMB and distributed branch offices because it offers: Voice + data consolidation Modular expansion Enterprise security features Scalable performance licensing This makes it a cost-effective entry enterprise router for branch deployments.

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