ISR4461/K9 – router – rack-mountable

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ISR4461/K9

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5ISR4461/K9 Description

Cisco ISR4461/K9, also referred to as ISR 4461 or Cisco 4461 router, is the flagship model of the Cisco 4000 Series Integrated Services Routers. It integrates 4 Gigabit Ethernet ports and 2 × 10 Gigabit SFP+ uplinks, together with 3 NIM slots and 3 SM-X slots for advanced service modules. With throughput scalable from 1.5 Gbps to 3 Gbps, the ISR4461 is engineered for very large branches, regional hubs, or campus edge deployments that demand secure WAN aggregation, voice, collaboration, and SD-WAN capabilities. With up to 32 GB DRAM, 32 GB flash, high PoE capacity, and redundancy options, it provides enterprise-grade resiliency and scalability.

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

3

On-board PVDM/ISC

1

Aggregate Throughput

1.5 Gbps base, up to 3 Gbps (licensed)

Default / Max DRAM

8 GB / 32 GB

Default / Max Flash

8 GB / 32 GB

Max Power with PoE

~1450 W (with PoE PSU boost)

Rack Units

3 RU

Weight

~14 kg

Key Features

High-Capacity Branch and Hub Routing

Provides 1.5–3 Gbps aggregate throughput, enabling large branch offices, regional hubs, and campus edges to consolidate high-volume WAN traffic with ease.

Extensive Modularity for Service Integration

With 3 NIM slots and 3 SM-X slots, the ISR4461 supports WAN, security, UCS-E compute, and EtherSwitch modules, allowing enterprises to deploy tailored services on a single platform.

Advanced Collaboration and Voice Readiness

Integrated ISC slot for PVDM4 DSPs delivers SRST, conferencing, and secure transcoding, making the router a reliable UC gateway for distributed organizations.

Enhanced Security and SD-WAN Capabilities

Hardware-accelerated VPN, IPSec, and Cisco SD-WAN functions provide encrypted tunnels, application visibility, and policy-based traffic control.

High PoE Capacity for Converged Access

Supports up to 1450 W PoE with a PoE PSU boost, powering large numbers of IP phones, access points, or surveillance devices directly from the chassis.

Enterprise Reliability and Scale

Redundant PSU options, field-replaceable modules, advanced IOS XE software, and extensive memory (up to 32 GB DRAM) ensure long-term stability and scalability for mission-critical deployments.

Applications Scenarios

Large Enterprise Branches and Regional Hubs

Designed for organizations that require multi-gigabit WAN throughput, integrated UC services, and secure SD-WAN connectivity across hundreds of users.

Financial Services, Healthcare, and Retail Headquarters

Provides compliance-grade VPNs, resilient voice and video, and high-density PoE for critical environments where downtime or data breaches are unacceptable.

Public Sector, Government, and Higher Education

Suitable for mission-critical sites needing converged voice, video, and data services, high PoE budgets for connected devices, and flexible WAN options in campus networks.

Front View

ISR4461/K9

1

LED

2

Router power On/Off switch

3

Power supply unit (PSU1)

4

Router fan tray (hidden) behind removable bezel

5

Optional power supply unit (PSU0)

 

 

ISR4461/K9

1

PSU0: Power supply unit 0

2

PSU1: Power supply unit 1

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

M.2 SSD 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

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

5

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

6

SFP+/10 Gigabit Ethernet port (TE 0/0/4)

7

NIM slot 1 (shown with slot divider removed).

8

NIM slot 2 (shown with slot divider removed).

9

NIM slot 3 (shown with slot divider removed).

10

Ground Connection

11

Slot for label

12

Enhanced Service Module (SM-X) with double wide

13

Enhanced Service Module (SM-X) 3

14

SFP+/10 Gigabit Ethernet port (TE0/0/5)

15

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

16

SFP/Gigabit Ethernet port (GE 0/0/1)

17

RJ-45 Gigabit Ethernet GE 0/01

18

Console Port

19

USB Console Port

20

USB Port

ISR4461/K9

Product Comparison

Feature

ISR4451-X/K9

ISR4461/K9

ASR1001-X

GE Ports

4 × 1GE

4 × 1GE

6 × 1GE

10GE Ports

2 × 10GE (SFP+)

2 × 10GE (SFP+)

2 × 10GE

NIM Slots

3

3

–

SM-X Slots

2 (1 double-wide)

3

–

On-board PVDM/ISC

1

1

–

DRAM Default / Max

8 / 32 GB

8 / 32 GB

16 / 64 GB

Flash Default / Max

8 / 32 GB

8 / 32 GB

8 / 64 GB

Aggregate Throughput

1–2 Gbps

1.5–3 Gbps

2.5–20 Gbps

Max PoE with PSU

1000 W

1450 W

–

Rack Units

2 RU

3 RU

1 RU

Weight

~13 kg

~14 kg

~15 kg

ISR4000 Supported Modules

Module Type / Part Numbers

Supported on ISR4461/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 – 3 slots

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 ISR4461 (Cisco 4000 Series ISR) Form Factor 3RU rack-mount
GE Ports 4 × 10/100/1000 (RJ-45/SFP mix) 10GE Ports 2 × 10GE SFP+
NIM Slots 3 SM-X Slots 3
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
Default / Max DRAM 8 GB / 32 GB Default / Max Flash 8 GB / 32 GB
Aggregate Throughput 1.5 Gbps base, 3 Gbps licensed Encryption Hardware-accelerated VPN, SD-WAN
WAN/LAN via Modules NIMs for Serial, T1/E1 PRI, xDSL, LTE, EtherSwitch SFP Support 1G and 10G optics supported
Power Supply AC/DC redundant PSU options Max PoE Budget Up to 1450 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) 5.25 × 17.25 × 18.5 in (133 × 438 × 470 mm) Weight ~14 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 ISR4461/K9 Access the detailed ISR4461/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
(5 reviews)
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4 Stars
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2 Stars
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1 Stars
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    Boba Fett
    Posted on 22/07/2024
    Verified Buyer
    5.0

    Heavy duty. Gets the job done. No questions asked.

    Mon Mothma
    Posted on 05/05/2024
    Verified Buyer
    5.0

    Coordination is key. This router connects our fleets. Excellent service.

    Network Architect
    Posted on 10/03/2024
    Verified Buyer
    5.0

    Highest performance in the ISR line. We use these for our regional hubs. Arrived safely on a pallet.

    IT Ops
    Posted on 18/01/2024
    Verified Buyer
    5.0

    Redundant power and control plane. Solid reliability.

    Procurement
    Posted on 15/11/2023
    Verified Buyer
    5.0

    Expensive hardware, but your pricing was competitive. Serial numbers verified with Cisco.

Questions & Answers

  • What is Cisco ISR4461/K9 designed for?

    A high-end ISR 4000 router for large branches and small campuses, delivering high encrypted throughput, modular WAN/LAN, and rich services like CUBE, SD-WAN, and advanced security.

  • How does ISR4461 compare to ISR4451-X?

    ISR4461 offers more performance headroom and slots for services. Choose 4461 when you need higher scale, dense voice, or heavier SD-WAN encryption at the edge.

  • Is SD-WAN supported?

    Yes. It runs IOS XE in traditional mode or Cisco SD-WAN mode with appropriate licensing, enabling centralized policies and app-aware routing.

  • What voice features are typical?

    CUBE for SIP trunks, SRST for survivability, and voice NIMs for analog/digital integration. QoS and DSP resources ensure call quality during congestion.

  • How to design for resilience?

    Use dual WAN transports, first-hop redundancy to LAN, and power redundancy where available. Test failover under traffic before go-live.

  • What about management and automation?

    Use web UI for day-0 setup, then NETCONF/RESTCONF/Ansible for templates. Telemetry and NetFlow support deep observability.

  • Any common deployment scenarios?

    Regional HQ, contact-center branches, or retail hubs consolidating WAN, voice, and security into one platform.

  • Licensing tips?

    Size security, CUBE sessions, and SD-WAN bandwidth licenses to real traffic; avoid over- or under-provisioning.

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Resources Downloads

  • ISR4461-K9 Datasheet

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