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by Cisco
Product Line: Cisco WSX690440G2T
Product Type: Switch
Original price $1,663.00 - Original price $7,882.00
Original price
$1,663.00 - $7,882.00
Current price $7,882.00
Title: Surplus

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Product Description

The WS-X6904-40G-2T module features 4 40 GbE ports with support for CFP-40G-LR4 and 40G-CFP-SR4 optics, enabling high-capacity networking. It offers a switch fabric connection of 80 Gbps Full Duplex, with an oversubscription ratio of 2:1 in Oversubscription Mode and 1:1 in Performance Mode, equipped with a DFC4-E forwarding engine supporting up to 256K forwarding entries. Designed for the Cisco Catalyst 6500 Series, it supports a maximum port density of 32 x 40 Gigabit Ethernet ports or 128 (+2 Supervisor Uplink) 10 Gigabit Ethernet Ports in a 6509-E Chassis, and is compatible with Cisco IOS Supervisor Engine 2T and 2TXL.

Key Feature for the WSX690440G2T

  • What is the maximum number of 40 GbE ports supported on a single chassis?
    The maximum port density per chassis is 32 x 40 Gigabit Ethernet Ports.
  • How are queues managed in this device?
    Queues are managed through Class of Service (CoS) based queue mapping and Differentiated Services Code Point (DSCP) based queue mapping.
  • What types of optics are compatible with this device?
    Optics compatible include CFP-40G-LR4 and 40G-CFP-SR4.
  • What is the switch fabric connection speed?
    The switch fabric connection speed is 80 Gbps Full Duplex.
  • Can you describe the oversubscription ratios available?
    There are two oversubscription modes: 2:1 (Oversubscription Mode) and 1:1 (Performance Mode).
  • What forwarding engine is equipped?
    The device is equipped with DFC4-E for Distributed Forwarding.
  • How many forwarding entries are supported?
    It supports 256K forwarding entries.
  • What are the scheduler mechanisms used?
    The scheduler mechanisms used are Deficit Weighted Round Robin (DWRR) and Weighted Random Early Detection (WRED).
  • What is the total buffer size for port buffers?
    The total buffer size is 10 MB for Ingress and 176 MB for Egress.
  • What chassis is this device for use with?
    This device is for use with the Cisco Catalyst 6509-E Chassis.

Product Review

The Cisco WS-X6904-40G-2T offers four 40 GbE ports with support for both CFP-40G-LR4 and 40G-CFP-SR4 optics, providing flexibility in connectivity. Its ability to switch between 2:1 oversubscription and 1:1 performance modes, along with the DFC4-E for distributed forwarding, enhances network efficiency and performance scalability. However, the module's power requirement of 468 W and its operational temperature range of 0 °C to 40 °C might limit its deployment in environments with stringent energy or cooling constraints.


The Cisco WS-X6904-40G-2T is a high-capacity module designed for the Catalyst 6500 Series switches, offering exceptional scalability and performance for demanding network environments. This module is equipped with four 40 Gigabit Ethernet (GbE) ports and supports a variety of optics such as CFP-40G-LR4 and 40G-CFP-SR4, accommodating diverse network requirements. It is engineered to provide an 80 Gbps full duplex switch fabric connection, ensuring efficient data transfer and communication across the network. This module offers flexible oversubscription capabilities, with a 2:1 oversubscription mode for optimized bandwidth allocation and a 1:1 performance mode for applications requiring maximum throughput. The onboard forwarding engine, DFC4-E, enhances the module's processing capabilities, supporting up to 256K forwarding entries for efficient data routing and management. In terms of data handling, the WS-X6904-40G-2T implements advanced queuing mechanisms, including Class of Service (CoS) and Differentiated Services Code Point (DSCP) based queue mapping. These mechanisms, along with the Deficit Weighted Round Robin (DWRR) and Weighted Random Early Detection (WRED) schedulers, ensure prioritized data delivery and effective congestion management. The module is also equipped with significant port buffers, featuring 10 MB for ingress and 176 MB for egress, facilitating smooth data flow and reducing packet drops. Supporting jumbo frames up to 9216 bytes, this module is capable of handling large data packets, improving network efficiency and reducing processing overhead. It is designed to maximize port density within a chassis, allowing up to 32 x 40 Gigabit Ethernet ports or 128 (+2 Supervisor Uplink) 10 Gigabit Ethernet ports in a 6509-E chassis, further extendable in a Virtual Switching System (VSS) configuration. Compatibility is a key aspect of the WS-X6904-40G-2T, supporting both the Cisco IOS Supervisor Engine 2T and 2TXL. It comes with 2 GB of onboard memory and meets rigorous environmental standards, including various ETSI ETS 300 019 classes for storage, transportation, and stationary use. The module's physical dimensions are 1.2 x 14.4 x 16 inches, and it weighs 12 lbs, making it a compact yet powerful addition to the Catalyst 6500 Series switches. Operating within a temperature range of 0 °C to 40 °C and a storage temperature range of -40 °C to 75 °C, the module is designed for reliability in various environmental conditions. Its power requirement stands at 468 W, and it features intuitive indicators for status, link, and blue beacon signals, simplifying maintenance and monitoring.
  • Supports up to 64 x 40 Gigabit Ethernet ports per VSS in a 6509-E chassis.
  • Equipped with advanced queuing and scheduling mechanisms for efficient data handling.
  • Designed for compatibility with Cisco Catalyst 6500 Series switches and IOS Supervisor Engine 2T and 2TXL.
Overall, the Cisco WS-X6904-40G-2T module is a versatile and powerful solution for enhancing network capacity, offering extensive features and capabilities to meet the requirements of modern data centers and enterprise networks.


Part Number and ManufacturerCisco WS-X6904-40G-2T
Port Count4 x 40 GbE
Compatible OpticsCFP-40G-LR4, 40G-CFP-SR4
Connection to Switch Fabric80 Gbps Bi-directional
Oversubscription Ratios2:1 in Oversubscription Mode, 1:1 in Performance Mode
Forwarding ProcessorIncludes DFC4-E for Enhanced Distribution of Forwarding
Routing Table SizeSupports 256,000 Entries
Queue ManagementMapping based on Class of Service (CoS) and Differentiated Services Code Point (DSCP)
Scheduling AlgorithmsDeficit Weighted Round Robin (DWRR) and Weighted Random Early Detection (WRED)
Buffer Size10 MB Ingress, 176 MB Egress
Support for Large FramesSupports Frames up to 9216 Bytes
Max Port Capacity per ChassisUp to 32 x 40GbE or 128 (+2 Supervisor Uplink) x 10GbE on 6509-E Chassis
Compatible Chassis6509-E
Compatible Supervisor EnginesSupports Cisco IOS Supervisor Engine 2T and 2TXL
Dimensions (H x W x D)1.2 x 14.4 x 16 inches
Unit Weight12 pounds
Operational Temperature Range0 °C to 40 °C
Storage Temperature Range-40 °C to 75 °C
Humidity Tolerance10% to 90% non-condensing
Power Consumption468 W
Diagnostic LEDsStatus, Link Activity, and Beacon Signal
ComplianceETSI ETS 300 019-2-1 Class 1.2 Storage, ETS 300 019-2-2, 2.3 Transportation, ETS 300 019-2-3 Class 3.2 Stationary Use
Intended UseDesigned for Cisco Catalyst 6500 Series Switches
Max Port Capacity in VSS64 x 40GbE or 256 x 10GbE Ports on 6509-E Chassis

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