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by Cisco
Product Line: Cisco 4000 Series
Product Type: Integrated Services Router
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Original price $0.00 - Original price $0.00
Original price
$0.00 - $0.00
Current price $0.00
Title: Surplus

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Product Description

The ISR4431-AX/K9 is a Cisco router equipped with a License AX for advanced services, supporting firewall, VPN, and various routing protocols including BGP, EIGRP, and IPv4-to-IPv6 Multicast. It features 4 GB of DDR3 SDRAM (expandable to 16 GB), 8 GB of flash memory (expandable to 32 GB), and 4 WAN ports for comprehensive connectivity options. Designed for rack mount with a form factor of 1U, it offers 4 SFP ports, 2 USB 2.0 ports, and supports hot plug, ensuring versatile and reliable network infrastructure deployment.

FAQs for the ISR4431-AX/K9

  • What is the maximum RAM supported by License AX?
    The maximum RAM supported is 16 GB.
  • Does the device support VPN?
    Yes, VPN support is included.
  • How many WAN ports are available on this model?
    There are 4 WAN ports.
  • Can the flash memory be expanded on License AX?
    Yes, the flash memory can be expanded up to 32 GB.
  • What type of memory technology is used?
    DDR3 SDRAM is the memory technology used.
  • Is there a USB port available for connectivity?
    Yes, there are 2 Type A USB 2.0 ports available.
  • What routing protocols does License AX support?
    It supports BGP, BFD, DVMRP, EIGRP, GRE, IGMPv3, IPv4-to-IPv6 Multicast.
  • What are the dimensions of this device?
    The dimensions are 1.7 x 18.52 x 20 inches (H x W x D).
  • What is the form factor of License AX?
    It has a rack mount form factor, occupying 1 rack unit.
  • Does License AX offer remote management capabilities?
    Yes, it supports remote management via RMON and SNMP.

Product Review

The Cisco ISR4431-AX/K9 integrates multiple network services including advanced security with firewall and VPN support, making it suitable for managing diverse network requirements efficiently. However, it comes with 4 GB of RAM and 8 GB of flash memory, which might require upgrades to handle more demanding tasks, given that it supports up to 16 GB of RAM and 32 GB of flash memory. Its comprehensive connectivity options, including Ethernet, fast Ethernet, and Gigabit Ethernet, along with expansion capabilities through SFP ports and USB 2.0, offer flexible integration into various network architectures.


The Cisco ISR4431-AX/K9 integrates multiple network services into a single, compact form factor, designed to provide high performance for medium to large enterprise branch offices. This product is equipped with advanced features that cater to various networking needs, from advanced routing and security to voice and video processing. At its core, the Cisco ISR4431-AX/K9 is powered by DDR3 SDRAM memory technology, with 4 GB of RAM installed and an option to expand up to 16 GB. This allows for efficient multitasking and handling of memory-intensive applications. The device also comes with 8 GB of flash memory, ensuring ample storage for the operating system and applications, with the capability to expand this up to 32 GB. Connectivity is a strong suit of the ISR4431-AX/K9, offering wired connections with support for Ethernet, Fast Ethernet, and Gigabit Ethernet data link protocols. This ensures high-speed data transfer rates and compatibility with various network infrastructures. The router provides four WAN ports, allowing for multiple connections to the internet or other external networks, enhancing redundancy and network availability.
  • License AX with comprehensive VPN support, ensuring secure remote access and data encryption.
  • Integrated firewall to safeguard against external threats and unauthorized access.
  • Four SFP ports for fiber connectivity, enabling high-speed network connections and long-distance links.
For management and configuration, the device supports remote management protocols such as RMON and SNMP, facilitating easy monitoring and management of the network infrastructure. Routing protocols including BGP, EIGRP, and IPv4-to-IPv6 Multicast are supported, allowing for flexible network design and efficient routing of traffic across diverse network topologies. Expansion capabilities are provided through one expansion slot, offering the ability to add additional interfaces or capabilities in the future. The device also features two USB 2.0 ports for easy file transfers and backups, and management ports including one RJ-45 for console access and one auxiliary RJ-45, providing various options for device management and configuration. Designed for rack mounting, the ISR4431-AX/K9 occupies 1 rack unit, making it easy to integrate into existing server racks. Its dimensions are 1.7 x 18.52 x 20 inches, ensuring it doesn't require excessive space. The router supports hot plug for power supplies, minimizing downtime during maintenance or power supply replacement. The Cisco ISR4431-AX/K9 runs on Cisco IOS IP Base and Cisco IOS Security, offering a reliable and secure operating system environment. This software foundation provides advanced network services, security, and management features, enabling the router to handle a wide range of network tasks efficiently. In summary, the Cisco ISR4431-AX/K9 is a versatile and efficient router designed for enterprise environments requiring high-speed connectivity, advanced routing capabilities, and robust security features. Its expandable memory and storage, multiple connectivity options, and support for remote management make it a practical choice for businesses looking to optimize their network infrastructure.


Item NumberISR4431-AX/K9
License TypeAX
Integrated FirewallEnabled
USB Interface AvailableEnabled
Support for VPNEnabled
Type of ConnectivityCable
Type of MemoryDDR3 SDRAM
Initial RAM4 GB
Max RAM Capacity16 GB
Initial Flash Storage8 GB
Max Flash Storage Capacity32 GB
Supported Network ProtocolsEthernet, Fast Ethernet, Gigabit Ethernet
Installation TypeDesigned for Rack Mounting
Supported Remote Management ProtocolsRMON, SNMP
Supported Routing ProtocolsBGP, BFD, DVMRP, EIGRP, GRE, IGMPv3, IPv4/IPv6 Multicast
Number of WAN Interfaces4
Number of Expansion Bays1
Serial Interfaces1 Console RJ-45, 1 Auxiliary RJ-45
USB 2.0 Interfaces2 Type A
Management Interface1 RJ-45
SFP Ports Quantity4
Support for Hot SwappingEnabled
Preinstalled SoftwareCisco IOS IP Base, Cisco IOS Security
Compatibility with Power SuppliesSupported
Unit Size in Rack Units1U
Dimensions (H x W x D)1.7 x 18.52 x 20 inches

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