• Model-Cisco ISR4451-X-AX/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


Predictable performance

Predictable performance

High-availability architecture designed for mission-critical branches that delivers predictable performance at maximum speeds, offering modularity to connect from any remote location.


Network services

Network services

Deploy key integrated network services for your branch in minutes, virtually or on-premises, without compromising performance.


Simplified management

Simplified management

Configure and monitor your network and enforce business policies through Cisco DNA Center and Cisco SD-WAN. Simplify network automation and turn hours of work into seconds.


Threat protection

Threat protection

Protect your branch site across the LAN and WAN and in the cloud with security integrated into the router. You no longer need a separate security appliance.

SKU: CISCO ISR 4451-X-AX/K9 Category:


Sub Brands



Description Cisco ISR 4451 AppX Advanced services router (2GE,2NIM,1SM,8G FLASH,4G DRAM,MPLS, OTV)
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)

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


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