ISR4331-AX/K9
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Cisco ISR4451-X/K9 Integrated Services Router

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ISR4451-X/K9 Overview

Cisco 4451 Integrated Services Router, named as ISR4451-X, which supports 2 Enhanced service-module (SM-X) slots, delivers 1 Gbps to 2Gbps aggregate throughput. This router also supports two kinds of DDRM, data plane and control/services plane, which make administrator easy to manage the router.

Quick Specs

Product Code Cisco

ISR4451-X/K9
Aggregate Throughput 1 Gbps to 2Gbps
Total onboard WAN or LAN 10/100/1000 ports 4
RJ-45-based ports 4
SFP-based ports 4
Enhanced service-module (SM-X) slot 2
NIM (Network Interface Modules) slots 3
Onboard ISC slot 1
DDRM (data plane) 2 GB (default) / 2 GB (maximum)
DDRM (control/services plane) 4 GB (default) / 16 GB (maximum)
Flash Memory 8 GB (default) / 32 GB (maximum)
Power-supply options Internal: AC, DC (roadmap) and PoE
Rack height 2 RU
Dimensions (H x W x D) 88.9 x 438.15 x 469.9 mm
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Aggregate Throughput 1 Gbps to 2Gbps
Total onboard WAN or LAN 10/100/1000 ports 4
RJ-45-based ports 4
SFP-based ports 4
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) NA
Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) NA
Default memory DDR3 ECC DRAM (data plane) 2 GB
Maximum memory DDR3 ECC DRAM (data plane) 2 GB
Default memory DDR3 ECC DRAM (control/services plane) 4 GB
Maximum memory DDR3 ECC DRAM (control/services plane) 16 GB
Default flash memory 8 GB
Maximum flash memory 32 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 Internal: AC, DC and PoE
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 <50 A
Typical power (no modules) (watts) 158
Maximum power with AC power supply (watts) 450 (no PoE)
Maximum power with PoE power supply (platform only) (watts) 1000 with PoE redundant 1450 with PoE boost no redundancy
Maximum endpoint PoE power available from PoE power supply (watts) 500 W with optional redundancy
Maximum endpoint PoE power capacity with PoE boost (watts) 950 W no redundancy

Frequently Asked Questions

What is Cisco ISR4451-X/K9?

The Cisco ISR4451-X/K9 is a high-performance enterprise branch router in the Cisco 4000 Series Integrated Services Routers. It is designed for large branch offices needing secure WAN routing, modular expansion, and advanced enterprise services on a single platform.

What is the performance or throughput of ISR4451-X/K9?

The ISR4451-X/K9 supports up to 1 Gbps throughput, upgradeable to 2 Gbps with licensing, making it one of the highest-performance routers in the ISR 4000 family for enterprise branch environments.

What interfaces and expansion slots are available?

Key hardware capabilities include: 4 × integrated Gigabit Ethernet ports 3 × NIM slots for WAN modules 2 × SM-X service module slots Integrated management interfaces Modular architecture for future scalability This flexibility is a major reason enterprise buyers still search for this model.

Does ISR4451-X/K9 support VPN and secure WAN connectivity?

Yes. As part of Cisco’s enterprise ISR platform, it supports secure WAN architecture and encrypted traffic capabilities when paired with appropriate licenses, making it widely used for secure branch-to-HQ communication.

What is the replacement for ISR4451-X/K9?

Cisco recommends moving to Cisco Catalyst C8300 Series routers, especially: C8300-2N2S-4T2X C8300-2N2S-6T These newer platforms provide modern SD-WAN architecture and longer lifecycle support.

What is the difference between ISR4451-X/K9 and ISR4431/K9?

Main difference: ISR4451-X/K9 → higher performance (up to 2 Gbps), larger chassis, more expansion capability ISR4431/K9 → mid-range performance for medium branches Enterprise environments needing higher bandwidth typically choose ISR4451-X.

Why is ISR4451-X/K9 highly searched in enterprise networking?

Because it offers: Enterprise-grade routing performance Flexible modular design Strong lifecycle support (until 2028) Popular migration path from older ISR 3900 routers This makes it a common choice for network refresh projects.

Is ISR4451-X/K9 suitable for enterprise branch offices?

Yes. The ISR4451-X/K9 was designed for large enterprise branch deployments, where higher WAN performance, modular upgrades, and service integration are required. It is commonly deployed in multi-site organizations with heavy data and application usage.

Is ISR4451-X/K9 end-of-sale or still supported?

Yes — it has entered lifecycle transition: End-of-Sale: 7 November 2023 End-of-Support: 30 November 2028 This lifecycle information is one of the most searched topics by enterprise buyers planning upgrades.

Does ISR4451-X/K9 support SD-WAN environments?

Yes. ISR 4000 Series routers can run Cisco IOS-XE and are commonly deployed in SD-WAN architectures, allowing centralized policy control and application-aware routing across branches.

Is ISR4451-X/K9 still worth buying today?

Many organizations still deploy this model because: High enterprise performance Modular expandability Proven reliability Compatibility with existing enterprise networks However, buyers often compare it with Catalyst 8300 models for future-proofing.


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