WS-F6700-DFC3CXL Cisco Catalyst 6500 Distributed Forward Card Control Board

Cisco WS-F6700-DFC3CXL Catalyst Forward Card

The Cisco WS-F6700-DFC3CXL Distributed Forward Card is engineered to enhance the performance of compatible Cisco Catalyst 6500 Series line cards by enabling high-speed distributed forwarding. Designed for enterprise networks, large data centers, and service provider infrastructures, this module minimizes traffic bottlenecks by processing packets locally on the line card instead of relying solely on the supervisor engine. The result is lower latency, increased scalability, and superior overall network efficiency.

General Information

• Manufacturer: Cisco
• Part Number: WS-F6700-DFC3CXL
• Product Type: Distributed Forwarding Card

Optimized Hardware-Based Packet Processing

• Up to 450 Million Packets Per Second (Mpps) for IPv4 forwarding
• Up to 225 Million Packets Per Second (Mpps) for IPv6 forwarding
• Dedicated hardware forwarding for improved switching efficiency
• Reduced latency through distributed packet processing
• Enhanced throughput for mission-critical network applications

Large On-Board RAM Capacity

• 1024 MB (1 GB) onboard RAM
• Efficient storage for routing and forwarding databases
• Supports large enterprise network deployments
• Reliable operation during high-volume traffic conditions

MAC Address Support

• Supports up to 96,000 MAC address entries
• Ideal for large Layer 2 switching environments
• Improves scalability across extensive campus networks

IPv4 Routing Capacity

• Supports as many as 256,000 IPv4 routes
• Handles extensive routing tables efficiently
• Suitable for enterprise, campus, and service provider deployments

Layer 2 and Layer 3 Switching

• Hardware-based Layer 2 switching
• Hardware-accelerated Layer 3 routing
• Fast packet forwarding with minimal CPU utilization

Security and Traffic Control

• Comprehensive Access Control List (ACL) processing
• Hardware-based ingress policing
• Improved traffic filtering and policy enforcement

Quality of Service (QoS)

• Advanced QoS capabilities for traffic prioritization
• Supports latency-sensitive applications such as voice and video
• Maintains consistent application performance during peak utilization

Additional Network Technologies

• Multiprotocol Label Switching (MPLS) support
• Hardware-assisted multicast routing
• Enhanced forwarding efficiency for enterprise services

10 Gigabit Ethernet Modules

• WS-X6704-10GE – 4-Port 10 Gigabit Ethernet Module
• WS-X6708-10G-3CXL – 8-Port 10 Gigabit Ethernet Module
• WS-X6716-10GE – 16-Port 10 Gigabit Ethernet Module

Gigabit Ethernet Modules

• WS-X6724-SFP – 24-Port Gigabit Ethernet SFP Module
• WS-X6748-SFP – 48-Port Gigabit Ethernet SFP Module
• WS-X6748-GE-TX – 48-Port Gigabit Ethernet RJ-45 Module

Key Benefits

• Accelerates distributed Layer 2 and Layer 3 forwarding
• Minimizes network bottlenecks through local packet processing
• Supports large routing and MAC address tables
• Provides hardware-assisted ACL, QoS, MPLS, and multicast capabilities
• Improves scalability for enterprise and data center environments
• Optimized for compatible Cisco Catalyst 6500 Series line cards
• Delivers dependable performance for high-density networking deployments

Cisco WS-F6700-DFC3CXL Catalyst 6500 Forward Card

The Cisco WS-F6700-DFC3CXL Catalyst 6500 Distributed Forward Card is a high-performance switching enhancement module designed for the Catalyst 6500 Series modular switch architecture. It is engineered to extend the distributed forwarding capabilities of the chassis, enabling improved packet processing efficiency, reduced latency, and enhanced scalability in enterprise and service provider network environments. This hardware component plays a crucial role in offloading forwarding decisions from the central supervisor engine, allowing traffic to be processed locally on line cards for optimized throughput and network performance.

Architecture and Functional Role in Catalyst 6500 Series

The distributed forwarding architecture implemented by the WS-F6700-DFC3CXL is based on the principle of decentralizing packet switching decisions. Instead of relying solely on a central supervisor engine, each line card equipped with this distributed forwarding card is capable of independently performing Layer 2 and Layer 3 forwarding decisions. This architecture significantly reduces bottlenecks and ensures consistent performance even under heavy traffic loads.

Integration with Catalyst 6500 Line Cards

The WS-F6700-DFC3CXL is designed specifically for compatibility with select Catalyst 6500 line cards, particularly those in the WS-X67xx series. When installed, it enhances the line card’s local forwarding intelligence, enabling it to process routing tables, MAC address tables, and access control policies locally. This reduces dependency on centralized processing and increases the overall efficiency of the switching fabric.

Hardware Design and Performance Capabilities

At the core of the WS-F6700-DFC3CXL is a high-speed forwarding engine optimized for deterministic packet processing. It supports wire-speed forwarding across multiple interfaces simultaneously, ensuring that traffic flows remain uninterrupted even during peak utilization. The hardware is designed with specialized ASICs that accelerate lookup operations and reduce processing latency.

Memory and Table Handling

The card incorporates advanced memory architecture to handle large routing and switching tables. This includes optimized TCAM (Ternary Content Addressable Memory) utilization for rapid access control list processing and prefix matching. The ability to store and process extensive forwarding information base (FIB) entries locally enhances scalability for large enterprise networks.

Redundancy and High Availability

The WS-F6700-DFC3CXL supports high availability configurations within the Catalyst 6500 chassis. In redundant supervisor engine setups, distributed forwarding ensures that even in the event of a supervisor failure, traffic forwarding continues uninterrupted on capable line cards. This design is critical for mission-critical deployments such as data centers and financial networks.

Layer 2 Switching Capabilities

The distributed forward card accelerates Layer 2 switching operations by enabling local MAC address learning and forwarding. This reduces flooding and improves convergence times in large switched networks. VLAN segmentation and trunking operations are also handled efficiently at the line card level, improving inter-VLAN traffic performance.

Layer 3 Routing Acceleration

For Layer 3 operations, the WS-F6700-DFC3CXL supports hardware-based routing lookup and packet forwarding. It works in conjunction with routing protocols such as OSPF, EIGRP, and BGP by caching forwarding decisions locally. This reduces the need for repeated supervisor engine lookups and significantly increases packet throughput.

Quality of Service Implementation

Quality of Service policies are enforced at the hardware level through the distributed forwarding architecture. Traffic classification, prioritization, and queuing mechanisms are executed directly on the line card, ensuring consistent performance for latency-sensitive applications such as voice and video communication.

Enterprise Core and Distribution Layers

In enterprise networks, the WS-F6700-DFC3CXL is commonly deployed in core and distribution layer switches where high throughput and low latency are essential. It enables organizations to scale their network infrastructure without introducing performance degradation as traffic volume increases.

Data Center Switching Environments

Within data centers, this distributed forwarding card supports high-density server connectivity and east-west traffic optimization. Its ability to handle large volumes of internal data traffic makes it suitable for virtualization-heavy environments and cloud infrastructure deployments.

Service Provider Backbone Networks

Service providers utilize the Catalyst 6500 series with WS-F6700-DFC3CXL modules to support backbone routing and aggregation layers. The card’s ability to process large routing tables and enforce policy-based forwarding makes it suitable for carrier-grade deployments.

Enhanced Throughput Capabilities

By enabling local switching decisions, the WS-F6700-DFC3CXL significantly increases aggregate throughput across the Catalyst 6500 chassis. This architecture minimizes packet traversal across the backplane, reducing latency and improving overall system responsiveness.

Latency Reduction Mechanisms

Latency is reduced through hardware-based forwarding decisions and elimination of unnecessary control plane interactions. Packets are processed at line rate with minimal delay, which is particularly important for real-time applications and high-frequency trading systems.

Operational Efficiency and Network Management

Network administrators benefit from simplified traffic engineering due to the predictable behavior of distributed forwarding. Policies can be implemented centrally while execution occurs locally, reducing configuration complexity across large-scale deployments.

Monitoring and Diagnostics Support

The WS-F6700-DFC3CXL supports advanced diagnostics features integrated into the Catalyst 6500 platform. These include traffic monitoring, error detection, and performance analytics that assist in maintaining optimal network health and identifying bottlenecks before they impact service quality.

Compatibility with Cisco IOS Features

This distributed forwarding card is fully integrated with Cisco IOS software capabilities, ensuring compatibility with advanced routing protocols, security features, and management tools. It works seamlessly within existing Catalyst 6500 configurations without requiring major architectural changes.

Hardware Reliability and Engineering Design

The card is engineered with efficient thermal dissipation mechanisms to ensure stable operation under high workloads. Its compact design allows it to integrate seamlessly into the Catalyst chassis without affecting airflow or cooling efficiency.

Durability in Enterprise Environments

Built for long-term deployment, the WS-F6700-DFC3CXL is designed to withstand continuous operation in demanding environments. Its robust hardware construction ensures minimal failure rates and consistent performance over extended operational lifecycles.

Failover and Recovery Mechanisms

In the event of network disruptions, the distributed forwarding system supports rapid failover and recovery. Routing and forwarding tables are maintained in a way that allows quick restoration of services without significant downtime.

Advanced Switching Intelligence

Packet classification is handled at the hardware level, enabling rapid identification of traffic types and application flows. This supports advanced policy enforcement and improves network efficiency by reducing software processing overhead.

Flow Optimization Techniques

The WS-F6700-DFC3CXL implements flow optimization mechanisms that allow repeated traffic patterns to be processed more efficiently. This reduces redundant computations and enhances overall switching performance in high-traffic environments.

Integration with Security Policies

Security policies such as ACL enforcement and traffic filtering are executed directly within the distributed forwarding architecture. This enhances network security by ensuring that malicious or unauthorized traffic is filtered at the earliest possible processing stage.

Role in Modern Network Evolution

The WS-F6700-DFC3CXL represents a significant step in the evolution of network architecture from centralized switching to distributed intelligence. This shift allows for greater scalability and improved resilience in modern enterprise and carrier networks.