ISR4451-X/K9 – router – rack-mountable

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ISR4451-X/K9

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List Price: $7489 $2454.03
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Condition New Factory Sealed Related Quantity
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Shipping Express Shipping 2-6 Days, via DHL, FedEx, UPS, etc. Packaging weight and dimensions included:
Weight 19.1 kg
Dimensions 25 × 56 × 68 cm
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ISR4451-X/K9 Description

Cisco ISR4451-X/K9, also known as ISR 4451-X or Cisco 4451 router, is a high-performance branch router in the Cisco 4000 Series. It integrates 4 Gigabit Ethernet ports and 2 × 10 Gigabit SFP+ interfaces, along with 3 NIM slots and up to 2 SM-X slots for advanced service modules. With throughput scalable from 1 Gbps to 2 Gbps under performance licensing, the ISR4451-X supports demanding enterprise branch networks requiring WAN aggregation, SD-WAN, voice, and security services. It supports up to 32 GB DRAM, 32 GB flash, dual power supply redundancy, and advanced PVDM4 DSP options, making it an ideal solution for large branches or regional hubs.

Product Highlights

Aggregate Throughput (Default)
RJ-45-based ports
SFP-based ports

Quick Specs

Parameter

Specification

GE Ports

4 × 10/100/1000 (RJ-45/SFP mix)

10GE Ports

2 × 10GE (SFP+)

NIM Slots

3

SM-X Slots

2 (1 double-wide or 2 single-wide)

On-board PVDM/ISC

1

Aggregate Throughput

1 Gbps base, up to 2 Gbps (licensed)

Default / Max DRAM

8 GB / 32 GB

Default / Max Flash

8 GB / 32 GB

Max Power with PoE

1000 W (with PoE PSU boost)

Rack Units

2 RU

Weight

~13 kg

Key Features

High-Performance Branch Routing

Supports 1–2 Gbps aggregate throughput, making it suitable for large branch offices and regional hubs that need fast and reliable WAN performance.

Flexible Modular Expansion

Offers 3 NIM slots and 2 SM-X slots, allowing integration of WAN, voice, LTE, storage, or UCS-E compute modules for tailored branch services.

Integrated Voice and Collaboration

Onboard ISC for PVDM4 DSP modules provides SRST, conferencing, and transcoding, ensuring voice continuity even during WAN outages.

Advanced WAN Security

Hardware-accelerated VPN and SD-WAN features deliver encrypted tunnels, segmentation, and application visibility for secure and optimized traffic.

High PoE Capacity

With PoE-capable PSU, the router delivers up to 1000 W of power to IP phones, cameras, and wireless access points, enabling converged branch access.

Enterprise-Grade Reliability

Redundant power supply support, robust cooling, and Cisco IOS XE software provide long-term stability and simplified lifecycle management.

Front View

ISR4451-X/K9

1

Router fan tray (hidden) behind removable bezel

2

LEDs

3

Router power On/Off switch

4

AC power supply unit (PSU0)

5

AC power supply unit (PSU1)

 

 

ISR4451-X/K9

1

PSU0: Power supply unit 1

2

PSU1: Power supply unit 2

3

GE POE: Internal PoE daughter card status

4

FLASH: Compact flash status

5

TEMP: Temperature status

6

PWR: Power

7

STAT: System status

8

FAN: Fan status

9

ISC: Integrated Services Card status

10

POE BOOST: Power over Ethernet boost mode

11

POE 1: Power over Ethernet 1status

12

POE 0: Power over Ethernet 0 status

Rear View

1

GE 0 management port

2

Auxiliary port

3

RJ-45 Gigabit Ethernet port (GE 0/0/0)

4

LEDs for the GE 0/0/0 interface (See Table 1-1 for detailed LED information)

5

SFP/Gigabit Ethernet port (GE 0/0/0)

6

SFP/Gigabit Ethernet port (GE 0/0/2)

7

LEDs for the GE 0/0/2 interface

8

RJ-45 Gigabit Ethernet port (GE 0/0/2)

9

NIM slot 1 (shown with slot divider removed).

10

NIM slot 2 (shown with slot divider removed).

11

NIM slot 3

12

Ground connection

13

Enhanced Service Module (SM-X) 2

14

Enhanced Service Module (SM-X) 1

15

RJ-45 Gigabit Ethernet port GE 0/0/3

16

LEDs for the GE 0/0/3 interface

17

SFP/Gigabit Ethernet GE 0/0/3

18

SFP Gigabit Ethernet GE 0/0/1

19

LEDs for the GE 0/0/1 interface

20

RJ-45 Gigabit Ethernet port GE 0/0/1

21

Serial console port

22

USB Type B mini port

23

USB 0 and USB 1

 

 

ISR4451-X/K9

Applications Scenarios

Enterprise Branches and Regional Hubs

Suited for medium and large offices that require resilient WAN connectivity, application-aware routing, and secure VPN to connect to HQ or cloud services.

Financial, Retail, and Healthcare Networks

Supports secure VPN for sensitive data, compliance-driven connectivity, and integrated voice services for environments where uptime is critical.

Government, Education, and Public Sector

Provides modular WAN connectivity, high PoE budgets, and voice survivability, making it suitable for multi-service deployments at mission-critical sites.

Product Comparison

Feature

ISR4431/K9

ISR4451-X/K9

ISR4461/K9

GE Ports

4 × 1GE

4 × 1GE

4 × 1GE

10GE Ports

None

2 × 10GE (SFP+)

2 × 10GE (SFP+)

NIM Slots

3

3

3

SM-X Slots

None

2 (1 double-wide)

3

On-board PVDM/ISC

1

1

1

DRAM Default / Max

4 / 16 GB

8 / 32 GB

8 / 32 GB

Flash Default / Max

8 / 32 GB

8 / 32 GB

8 / 32 GB

Aggregate Throughput

500 Mbps – 1 Gbps

1 – 2 Gbps

1.5 – 3 Gbps

Max PoE with PSU

250 W

1000 W

1450 W

Rack Units

1 RU

2 RU

3 RU

Weight

~6.2 kg

~13 kg

~13 kg

ISR4451-X/K9 Supported Modules

Module Type / Part Numbers

Supported on ISR4451-X/K9

Network Interface Modules (NIMs)

Yes – 3 slots

NIM-1GE-CU-SFP / NIM-2GE-CU-SFP

Yes

NIM-1MFT-T1/E1 / NIM-2MFT-T1/E1

Yes

NIM-4MFT-T1/E1 / NIM-8MFT-T1/E1

Yes

NIM-1CE1T1-PRI / NIM-2CE1T1-PRI

Yes

NIM-ES2-8 / NIM-ES2-8-P

Yes (PoE requires PoE PSU)

NIM-SSD / NIM-HDD

Yes

LTE / xDSL NIM variants

Yes

Service Modules (SM-X)

Yes – 2 slots (1 double-wide supported)

UCS-E Compute/Virtualization Modules

Yes

On-board PVDM4 / ISC

Supported

SFP/SFP+ Modules

Supported (1G and 10G optics)

Legacy WIC/EHWIC

Not supported

Specifications

Parameter Specification Parameter Specification
Model ISR4451-X (Cisco 4000 Series ISR) Form Factor 2RU rack-mount
GE Ports 4 × 10/100/1000 (RJ-45/SFP mix) 10GE Ports 2 × 10GE SFP+
NIM Slots 3 SM-X Slots 2 (1 double-wide)
On-board ISC 1 slot for PVDM4 DSPs USB Ports 2 × USB 2.0 Type-A, 1 × mini-USB console
Console / AUX RJ-45 console and RJ-45 auxiliary Operating System Cisco IOS XE
DRAM Default / Max 8 GB / 32 GB Flash Default / Max 8 GB / 32 GB
Aggregate Throughput 1 Gbps base, 2 Gbps licensed Encryption Hardware-assisted VPN and SD-WAN
WAN/LAN via Modules NIMs for Serial, T1/E1 PRI, xDSL, LTE, EtherSwitch SFP Support 1000 Mbps and 10G optics supported
Power Supply AC/DC options, redundant PSU supported Max PoE Budget Up to 1000 W with PoE PSU boost
Cooling Integrated fan system Operating Temp 0–40 °C
Humidity 5%–85% non-condensing Altitude 0–10,000 ft
Dimensions (H×W×D) 3.5 × 17.25 × 18.5 in (88.9 × 438 × 470 mm) Weight ~13 kg
Compliance IEC/EN/UL 60950-1/62368-1, CISPR 22/24 Class A Licensing Performance, Security, UC, AppX

Get More Information

Discover unbeatable prices and fast shipping for the ISR4451-X/K9 Access the detailed ISR4451-X/K9 datasheet and ensure you’re getting the best deal with our reliable delivery service. Need assistance? Our free live chat support is here to help. For more information about the product and pricing, contact us via Live chat or email us at [email protected]

Quality Certifications

Customer Reviews

Write A Review
5.0
(4 reviews)
5 Stars
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4 Stars
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2 Stars
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1 Stars
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    Darth Vader
    Posted on 10/09/2024
    Verified Buyer
    5.0

    Impressive. Most impressive. The power of this router is undeniable.

    Core Network Arch
    Posted on 02/05/2024
    Verified Buyer
    5.0

    The 4451-X is a beast. 2Gbps throughput verified. Using it for CUBE/Voice gateway.

    Procurement
    Posted on 18/01/2024
    Verified Buyer
    5.0

    Big box, arrived on a pallet. Everything secure.

    Yoda
    Posted on 05/12/2023
    Verified Buyer
    5.0

    Good router it is. Fast shipping, hmm?

Questions & Answers

  • Where does ISR4451-X/K9 fit?

    A powerful ISR 4000 for larger branches needing modular WAN, high crypto performance, and services like CUBE and SD-WAN with room to grow.

  • ISR4451-X vs ISR4431—key difference?

    4451-X provides higher throughput and expansion capacity. Choose 4431 for mid-size branches, 4451-X for heavier traffic or more service modules.

  • Is SD-WAN supported?

    Yes. Operates in classic IOS XE or SD-WAN mode with controller-based templates and centralized policies.

  • What about voice services?

    Supports CUBE, SRST, and voice NIMs. It’s widely used for SIP trunking with QoS, policing, and high-availability designs.

  • How to ensure uptime?

    Dual WAN links, cellular backup, and redundant power (model dependent). Validate failover timing for critical applications like voice or POS.

  • Management/automation options?

    Day-0 GUI, then APIs, Ansible, and model-driven telemetry for scale. Maintain golden images and standardized templates.

  • Common use cases?

    Enterprise branches, healthcare sites, and finance offices consolidating WAN, security, and voice on one platform.

  • Licensing considerations?

    Align DNA/SD-WAN, security, and CUBE licenses with expected sessions and bandwidth to control costs.

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Resources Downloads

  • ISR4451-X-K9 Datasheet

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