ISR4351-SEC/K9
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Cisco ISR4351-SEC/K9 Integrated Services Router

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ISR4351-SEC/K9 Overview

Cisco

ISR4351-SEC/K9 is the Cisco ISR4351/k9 router with Security Bundle. Its other specifications are the same as ISR4351/k9.

Quick Specs

Table 1 shows the Quick Specs.

Product Code Cisco

ISR4351-SEC/K9
Bundle Security Bundle
Aggregate Throughput 200 Mbps to 400 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 3
SFP-based ports 3
Enhanced service-module (SM-X) slot 2
NIM (Network Interface Modules) slots 3
Onboard ISC slot 1
Memory 4 GB (default) / 16 GB (maximum)
Flash Memory 4 GB (default) / 16 GB (maximum)
Power-supply options Internal: AC, DC (roadmap), and PoE
Rack height 2 RU
Dimensions (H x W x D) 88.9 mm x 438.15 mm x 469.9 mm
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Type Cisco ISR4351/K9 with Security Bundle
Aggregate Throughput 200 Mbps to 400 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 3
SFP-based ports 3
Enhanced service-module slots 2
Doublewide service-module slots 1 (assumes no singlewide SM-X modules installed)
NIM slots 3
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) 16 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 16 GB
External USB 2.0 slots (type A) 2
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 Internal: AC, DC, 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) 7.1 to 3.0A
AC input surge current 60 A peak and less than 12 Arms per half cycle
Typical power (no modules) (watts) 48
Maximum power with AC power supply (watts) 430
Maximum power with PoE power supply (platform only) (watts) 990
Maximum endpoint PoE power available from PoE power supply (watts) 500

Frequently Asked Questions

What is Cisco ISR4351-SEC/K9?

The ISR4351-SEC/K9 is a Cisco 4000 Series Integrated Services Router that includes the Security (SEC) bundle license. It combines enterprise WAN routing with advanced security capabilities such as VPN and encrypted connectivity, making it ideal for secure branch office deployments.

What does “SEC/K9” mean in ISR4351-SEC/K9?

“SEC/K9” indicates the router includes Cisco’s Security Bundle license, which enables enterprise security features like encrypted VPN connectivity and advanced security services. This version is often chosen over the base ISR4351/K9 when businesses need built-in network security.

What is ISR4351-SEC/K9 mainly used for?

This router is commonly deployed for: Secure enterprise branch WAN routing Site-to-site VPN connectivity MPLS and Internet WAN access Hybrid cloud connectivity Secure remote office networking It is widely used as a secure WAN edge router in enterprise networks.

What is the throughput of Cisco ISR4351-SEC/K9?

The ISR4351-SEC/K9 supports aggregate throughput between 200 Mbps and 400 Mbps, depending on licensing and configuration. This makes it suitable for medium enterprise branches running secure business traffic.

What ports and expansion options are available on ISR4351-SEC/K9?

Typical hardware includes: 3 × Gigabit Ethernet RJ-45 ports 3 × SFP ports 3 × NIM expansion slots 2 × Enhanced Service Module slots Its modular architecture allows future expansion for voice, WAN, and additional services.

Does ISR4351-SEC/K9 support VPN and secure WAN connectivity?

Yes. The Security bundle enables enterprise-grade encrypted connectivity, including VPN support, making it suitable for secure branch-to-HQ communication and protected remote access scenarios.

Is ISR4351-SEC/K9 SD-WAN ready?

Yes. The ISR4351 platform runs Cisco IOS XE and can support SD-WAN deployments, allowing centralized policy control, intelligent traffic steering, and secure multi-site connectivity — one reason this model remains highly searched by enterprise teams.

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