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by Cisco
Product Line: Cisco ASR 9000 Series
Product Type: Route Switch Processor
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Title: Surplus

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Product Description

The A9K-RSP-4G is equipped with 4 GB DRAM internal memory and a 40 GB SAS HDD, running on Cisco IOS-XR Software Release 3.7.2 or later. It features a high-performance dual-core processor, 4 GB eUSB internal flash memory, and an additional 1 GB Compact Flash for external storage. Designed for high reliability, it includes fabric, power supply, RSP, and software redundancy, occupying 1 slot with dimensions of 1.65 x 16 x 26.53 inches and a weight of 18 lbs.

FAQs for the A9K-RSP-4G

  • What is the internal memory capacity of the device?
    The internal memory capacity is 4 GB DRAM.
  • How is the device's fabric designed?
    The device features a bidirectional nonblocking fabric.
  • What type of hard drive does the device use?
    It uses a 40 GB SAS HDD.
  • Can you describe the CPU specifications?
    The device is equipped with high-performance dual-core processors.
  • What version of software is required for optimal performance?
    Cisco IOS-XR Software Release 3.7.2 or later is required.
  • What options are available for external memory?
    The device supports 1 GB Compact Flash for external memory.
  • How does the device handle management connectivity?
    It includes two 10/100/1000 BASE-T (RJ-45) LAN management ports, one console port, and one auxiliary port.
  • What types of alarms does the device support?
    The device supports critical, major, and minor alarms.
  • What redundancy features are included?
    The device incorporates fabric redundancy, power supply redundancy, RSP redundancy, and software redundancy, ensuring no single point of failure.
  • What are the operating temperature limits?
    The operating temperature ranges from 0 °C to 40 °C.

Product Review

The CISCO A9K-RSP-4G excels in reliability, featuring no single point of failure and multiple forms of redundancy (fabric, power supply, RSP, and software), ensuring high availability for critical network operations. However, its internal memory capacity of 4 GB DRAM and a 40 GB SAS HDD may limit performance in highly demanding environments that require extensive data processing and storage. Additionally, the router supports Cisco IOS-XR Software Release 3.7.2 or later and includes a comprehensive set of management ports, offering flexibility and ease of management in diverse network configurations.


The CISCO A9K-RSP-4G is a key component of modern network infrastructure, designed to meet the demands of high-performance networking with a focus on reliability and scalability. This product overview delves into the hardware specifications that make it suitable for a wide range of networking applications. At the core of the A9K-RSP-4G are high-performance dual-core processors, facilitating efficient data processing and management capabilities. This is complemented by 4 GB of DRAM internal memory, ensuring smooth operation and multitasking capabilities. The device runs on Cisco IOS-XR Software Release 3.7.2 or later, providing a stable and feature-rich operating environment. Storage is handled by a 40 GB SAS hard drive, offering ample space for operating system files, logs, and other data. Additionally, the unit includes 4 GB of embedded USB (eUSB) flash memory for essential software and firmware, alongside 1 GB of Compact Flash external memory, allowing for easy software upgrades and backups. Connectivity and management are facilitated through various ports, including two 10/100/1000 BASE-T (RJ-45) LAN management ports, a console port, and an auxiliary port. This array of options ensures versatile connectivity for different network management scenarios. The device is designed with redundancy in mind, eliminating single points of failure. This includes fabric redundancy, power supply redundancy, Route Switch Processor (RSP) redundancy, and software redundancy, ensuring continuous operation even in the event of component failure. - Bidirectional nonblocking fabric supports efficient data flow through the device, preventing bottlenecks. - LED indicators provide at-a-glance status information on critical system components, including alarms, system synchronization, Compact Flash activity, hard disk drive status, and fan tray operation. - The device supports a range of environmental conditions, operating reliably between 0 °C and 40 °C and capable of being stored in temperatures ranging from -40 °C to 75 °C. Physically, the A9K-RSP-4G occupies a single slot, with dimensions of 1.65 x 16 x 26.53 inches and a weight of 18 lbs, making it a compact yet powerful addition to any network rack. Its power consumption is rated at 170 W, optimizing performance while keeping energy use in check. Designed for durability and long-term operation, it can function at altitudes from -60m to 4000m and in humidity levels ranging from 10% to 90% (non-condensing), accommodating a wide range of installation environments. In summary, the CISCO A9K-RSP-4G combines high-performance hardware with advanced networking software, offering a resilient and efficient solution for managing modern networks. Its comprehensive feature set and robust design make it an ideal choice for organizations looking to enhance their network infrastructure with a reliable, scalable, and efficient networking component.


Part Number and Manufacturer CISCO A9K-RSP-4G
Operating System Compatibility Supports Cisco IOS-XR Version 3.7.2 or newer
Switching Capacity Full-duplex, non-blocking
Storage Type 40 GB Serial Attached SCSI (SAS) Hard Disk Drive
Processor Specification Dual-Core Processors for high efficiency
Embedded Storage 4 GB embedded USB (eUSB)
Removable Storage 1 GB CompactFlash
Network Management Interfaces Dual Gigabit Ethernet (RJ-45) LAN ports, Single Console Port, Single Auxiliary Port
Notification Systems Three-tier Alarm System: Critical, Major, Minor
Indicator Lights Alarm Mute and Test Function, System Sync, CompactFlash Use, Hard Drive Status, Fan Operation Indicator
System Resilience Designed without a single failure point, supports component and path redundancy including power and routing switch processors
Slot Utilization Requires 1 slot
Physical Dimensions 1.65 x 16 x 26.53 inches
Unit Weight 18 lbs
Operational Temperature Range 0 to 40 °C
Storage Temperature Range -40 to 75 °C
Humidity Tolerance (Operating) 10% to 90% non-condensing
Energy Consumption 170 Watts
Operational Elevation Range -60m to 4000m above sea level

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