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by Cisco
Product Line: Cisco Catalyst 6900 Series
Product Type: Fiber Ethernet Module
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Title: Surplus

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Product Description

The WS-X6908-10G-2TXL is equipped with 8 10 GbE ports, supporting X2 optics, and connects to the switch fabric at 80 Gbps full duplex, ensuring a 1:1 oversubscription rate. This module features a DFC4XL forwarding engine, capable of supporting over 1 million forwarding entries, and offers advanced queuing mechanisms, including CoS and DSCP based queue mapping, with a scheduler that incorporates DWRR, WRED, and SRR algorithms at egress. It is designed for high-density networking environments, supporting up to 64 ports in a 6509-E chassis and 88 ports in a 6513-E chassis, with a port buffer of 256MB per port and jumbo frame support up to 9216 bytes.

FAQs for the WS-X6908-10G-2TXL

  • What are the optics used in this device?
    The device utilizes X2 optics.
  • How many ports does the part support?
    It supports eight 10 GbE ports.
  • What is the switch fabric connection capacity?
    The switch fabric connection has an 80 Gbps full duplex capacity.
  • Describe the oversubscription ratio for this hardware.
    The oversubscription ratio is 1:1.
  • What forwarding engine is equipped?
    It is equipped with a DFC4XL for distributed forwarding.
  • How many forwarding entries does it support?
    It supports over 1 million forwarding entries.
  • Can you detail the queuing mechanism utilized?
    The queuing mechanism includes Class of Service (CoS) based queue mapping and Differentiated Services Code Point (DSCP) based queue mapping.
  • What types of schedulers are implemented?
    Schedulers implemented are Deficit Weighted Round Robin (DWRR), Weighted Random Early Detection (WRED), and Smoothed Round Robin (SRR) at Egress.
  • How much buffer is allocated per port?
    Each port is allocated 256MB of buffer.
  • What is the maximum jumbo frame size supported?
    The maximum jumbo frame size supported is up to 9216 Bytes.

Product Review

The Cisco WS-X6908-10G-2TXL module offers eight 10GbE ports with X2 optics, providing high bandwidth connectivity and compatibility with various network infrastructures. It features an 80 Gbps full duplex switch fabric connection and 1:1 oversubscription, ensuring efficient data forwarding and minimal traffic bottlenecks. However, its substantial power requirement of 603 W and the necessity for a Cisco Catalyst 6500 E-Series Chassis for operation may limit its deployment flexibility in environments with existing hardware or energy constraints.


The Cisco WS-X6908-10G-2TXL is a high-performance module designed for the Cisco Catalyst 6500 E-Series chassis, delivering advanced networking capabilities and high-speed connectivity to meet the demands of diverse network environments. This module features eight 10 Gigabit Ethernet ports, which provide the bandwidth needed for data-intensive applications and high-speed data transfer. The use of X2 optics supports a range of optical networking standards, allowing for flexible deployment options. With an 80 Gbps full duplex switch fabric connection, the Cisco WS-X6908-10G-2TXL ensures efficient data flow across the network, minimizing bottlenecks and maximizing throughput. The module maintains a 1:1 oversubscription rate, indicating that it provides full bandwidth to all ports without reduction. This capability is essential for applications requiring consistent high-speed connectivity. The forwarding engine of this module is equipped with the DFC4XL, enabling distributed forwarding that supports over 1 million forwarding entries. This feature enhances the efficiency of data routing and switching, reducing latency and improving overall network performance. - The module supports a comprehensive queuing mechanism, including Class of Service (CoS) and Differentiated Services Code Point (DSCP) based queue mapping. This allows for sophisticated traffic prioritization and management, ensuring that critical data packets receive the attention they need. - It employs advanced scheduling algorithms such as Deficit Weighted Round Robin (DWRR), Weighted Random Early Detection (WRED), and Smoothed Round Robin (SRR) at the egress. These mechanisms enhance the module's ability to manage congestion and optimize traffic flow. - The Cisco WS-X6908-10G-2TXL is equipped with 256MB of port buffers and supports jumbo frames up to 9216 bytes, enhancing its ability to handle large data packets and reducing the need for packet fragmentation. This module can achieve a maximum port density of 64 ports in a 6509-E chassis and 88 ports in a 6513-E chassis, with the potential to double these figures in a Virtual Switching System (VSS) configuration. It is compatible with any Cisco Catalyst 6500 E-Series chassis and supports Supervisor Engine 2T and 2TXL. The Cisco WS-X6908-10G-2TXL comes with 2 GB of onboard memory, and its physical dimensions are 1.2 x 14.4 x 16 inches, with a weight of 12.6 lbs. It operates within a temperature range of 0 °C to 55 °C and can be stored in temperatures from -40 °C to 75 °C. The module's humidity tolerance ranges from 10% to 90% non-condensing, ensuring reliable performance in various environmental conditions. Requiring 603 W of power, the module includes status, link, and blue beacon indicators for easy monitoring of its operational status. It meets several ETSI standards, including ETS 300 019-2-1 for storage, ETS 300 019-2-2 and 2.3 for transportation, and ETS 300 019-2-3 for stationary use, affirming its durability and reliability for critical network infrastructure. Designed specifically for use with Cisco Catalyst 6500 Series switches, this module is an essential component for enterprises seeking to enhance their network's speed, reliability, and scalability.


Item Number WS-X6908-10G-2TXL
Manufacturer Cisco
Port Count 8 Ports of 10 Gigabit Ethernet
Optical Interface X2
Bandwidth to Switch Fabric 80 Gigabits per Second, Bidirectional
Subscription Ratio 1:1
Forwarding Processor Integrated with DFC4XL for Enhanced Packet Processing
Routing Table Capacity Over 1 Million Entries
Queue Management Supports CoS and DSCP for Mapping to Queues
Scheduling Algorithms DWRR, WRED, and SRR for Egress Traffic Management
Memory per Port 256 MB
Support for Large Frames Supports Frames up to 9216 Bytes
Max Ports in a Single Chassis 64 in 6509-E, 88 in 6513-E
Compatible Chassis Types All Catalyst 6500 E-Series Models
Supported Supervisor Engines Engine 2T and 2TXL Models
Dimensions 1.2 x 14.4 x 16 inches
Mass 12.6 pounds
Operating Temp Range 32°F to 131°F
Storage Temp Range -40°F to 167°F
Humidity Tolerance 10% to 90%, Non-Condensing
Power Draw 603 Watts
Diagnostic LEDs Indicators for Status, Link Activity, and Diagnostics
Compliance Standards ETSI ETS 300 019-2-1, 2-2, 2-3 for Storage, Transport, and Operational Conditions
Application Designed for Cisco Catalyst 6500 Series
Port Expansion in VSS Mode 128 Ports in 6509-E, 176 Ports in 6513-E

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