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by Cisco
Product Line: Cisco WS-X6816-10G-2TXL
Product Type: Switch
Original price $0.00 - Original price $3,942.00
Original price
$0.00 - $3,942.00
Current price $3,942.00
Title: Used

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Product Description

The WS-X6816-10G-2TXL Cisco module features 16 GbE ports with X2 optics, designed for high-density networking environments, supporting a switch fabric connection of 40 Gbps and an oversubscription ratio of 4:1. It incorporates a DFC4XL forwarding engine, enabling up to 1 million forwarding entries, and offers advanced queue mapping and scheduling capabilities, including CoS and DSCP-based queue mapping, and DWRR, WRED (in Oversubscription Mode), with additional SRR at Egress in Performance Mode. This module supports jumbo frames up to 9216 bytes, is compatible with Catalyst 6500 Supervisor Engine 2T and 2TXL, and is intended for use in any Cisco Catalyst 6500 E-Series Chassis, ensuring extensive scalability with a maximum port density of 128 ports per chassis and 352 ports per VSS.

Key Feature for the WS-X6816-10G-2TXL

  • What is the number of Gigabit Ethernet ports available on this network switch?
    The switch has 16 GbE ports.
  • How does the switch handle forwarding?
    The switch is equipped with a DFC4XL for distributed forwarding.
  • What type of optics does the device support?
    The device supports X2 optics.
  • Can you detail the switch's oversubscription rate?
    The oversubscription rate of the switch is 4:1.
  • What is the total switch fabric connection capacity?
    The total switch fabric connection capacity is 40 Gbps.
  • How many forwarding entries does the switch support?
    The switch supports 1 million forwarding entries.
  • What queuing mechanisms are used by this switch?
    The switch uses Class of Service (CoS) and Differentiated Services Code Point (DSCP) based queue mapping.
  • What are the port buffer sizes in different modes?
    In Oversubscription Mode, port buffers are 90 MB per port group, and in Performance Mode, they are 256 MB per port.
  • Does the switch support jumbo frames?
    Yes, the switch supports jumbo frames up to 9216 bytes.
  • What are the power requirements for this switch?
    The switch requires 503.5 W of power.

Product Review

The Cisco WS-X6816-10G-2TXL module delivers high-density 10GbE connectivity with 16 ports, optimized for scalable data center environments, supported by a 40 Gbps switch fabric connection and a forwarding engine equipped with DFC4XL for enhanced distributed forwarding, capable of supporting up to 1 million forwarding entries. However, its 4:1 oversubscription ratio may limit bandwidth availability under peak loads, potentially impacting performance in high-demand scenarios. Additionally, the module's comprehensive queuing mechanisms, including CoS and DSCP based queue mapping along with advanced scheduling options, ensure efficient traffic management, though its high power requirement of 503.5 W and operational temperature range necessitate a well-planned infrastructure for cooling and power supply.


The Cisco WS-X6816-10G-2TXL is a high-performance module designed for the Cisco Catalyst 6500 E-Series chassis, supporting up to 16 10-Gigabit Ethernet ports. This module offers a blend of speed, flexibility, and scalability, suitable for a wide range of applications including data centers, enterprise networks, and service provider environments. The hardware specifications of the WS-X6816-10G-2TXL position it as a key component for networks requiring high bandwidth and throughput. This module features X2 optics, providing a reliable interface for high-speed networking. The connection to the switch fabric is capable of 40 Gbps, ensuring efficient data transfer across the network. With an oversubscription rate of 4:1, the module balances performance with cost efficiency, making it an optimal choice for various deployment scenarios. At its core, the WS-X6816-10G-2TXL is equipped with a DFC4XL forwarding engine, enhancing its capability to process data at high speeds. It supports up to 1 million forwarding entries, facilitating efficient network routing and switching. The module incorporates advanced queuing mechanisms, including Class of Service (CoS) and Differentiated Services Code Point (DSCP) based queue mapping, ensuring prioritization and management of traffic flows. The scheduler on the module supports DWRR, WRED in Oversubscription Mode, and DWRR, WRED, SRR at Egress in Performance Mode, offering flexible traffic management options to optimize performance based on network demands. Port buffers are allocated with 90 MB per port group in Oversubscription Mode and increase to 256 MB per port in Performance Mode, providing ample buffer space for handling peak traffic loads. Key hardware specifications include: - Jumbo frame support up to 9216 bytes, allowing the transmission of large data packets and improving network efficiency. - Maximum port density per chassis is 128 ports, and for Virtual Switching System (VSS) configurations, it extends to 352 ports. - Compatibility with Catalyst 6500 Supervisor Engine 2T and 2TXL, ensuring seamless integration into existing network infrastructures. The module is designed for use in any Cisco Catalyst 6500 E-Series chassis, offering flexibility in deployment. It comes with 1 GB of onboard memory, enhancing its processing capabilities. The physical dimensions are 1.2 x 14.4 x 16 inches, with a weight of 13.6 lbs, making it a compact yet powerful solution for network expansion or upgrade. Operating conditions are designed to suit a variety of environments, with an operating temperature range of 0 °C to 55 °C and storage temperature from -40 °C to 75 °C. The module can function in relative humidity from 10% to 90% (non-condensing) and at altitudes from –500 to 10000 ft., ensuring reliability across different climatic conditions. Power requirements for the WS-X6816-10G-2TXL are 503.5 W, reflecting its high-performance capabilities. Indicators for status and link are provided, offering visual cues for network monitoring and troubleshooting. In summary, the Cisco WS-X6816-10G-2TXL is a versatile, high-capacity module designed for critical networking tasks. It combines speed, capacity, and flexibility, making it an essential component for modern, data-driven networks.


Part Number and ManufacturerCisco WS-X6816-10G-2TXL
Port Count16 GbE
Interface TypeX2
Switch Fabric Bandwidth40 Gigabits per second
Ratio of Oversubscription4 to 1
Forwarding ProcessorIncludes DFC4XL for decentralized packet processing
Routing Table EntriesSupports up to 1 Million entries
Queueing StrategyMapping based on Class of Service (CoS) and Differentiated Services Code Point (DSCP)
Packet SchedulingUses DWRR, WRED in Oversubscription Mode and DWRR, WRED, SRR in Performance Mode
Memory per Port Group90 MB in Oversubscription Mode, 256 MB in Performance Mode
Support for Jumbo FramesSupports frames up to 9216 Bytes
Max Ports per Chassis128 Ports
Max Ports per VSS352 Ports
Compatible Supervisor EnginesCatalyst 6500 Supervisor Engine 2T and 2TXL
Compatible ChassisAny Catalyst 6500 E-Series Chassis
Internal Memory1GB
Dimensions (H x W x D)1.2 x 14.4 x 16 inches
Unit Weight13.6 pounds
Operational Temperature Range0 °C to 55 °C
Temperature Range for Storage-40 °C to 75 °C
Humidity Tolerance10% to 90% non-condensing
Max Operating Altitude-500 to 10,000 feet
Power Consumption503.5 Watts
Diagnostic LEDsStatus and Link activity

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