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SYSTEM OVERVIEW

Modular Architecture

The Cisco Catalyst 6500 Series is a modular system that can grow as customer requirements expand and technology

evolves, allowing customers to upgrade and reconﬁgure systems by adding new modules, replacing existing modules,

and adding and redeploying systems. Throughout the Cisco Catalyst 6500 Series, modules are:

• Conﬁgurable—Separately, simplifying the addition of new services

• Interoperable—In the same chassis, providing ﬂexible design options

• Interchangeable—Among Cisco Catalyst 6500 Series systems, simplifying sparing and network expansion

• Hot-swappable—Without requiring a chassis to be powered off, providing fast upgrade and repair

• Upgradable—As newer modules come along, providing investment protection

Cisco Catalyst 6500 Series Hardware-Forwarding Architectures

Cisco Catalyst 6500 Series modules use one of three forwarding technologies, each having a different architecture

with different characteristics and capabilities:

• Cisco Express Forwarding (CEF)—Scaling to 30 Mpps, this technology uses a central CEF Cisco Express

Forwarding engine located on the supervisor engine's policy feature card (PFC) daughter and CEF forwarding

tables located on the supervisor engine. The supervisor engine makes all forwarding decisions for all interface

modules centrally. For more information see

• Accelerated Cisco Express Forwarding (aCEF)—Suited for high-performance enterprise environments, this

technology uses the aCEF engine and aCEF tables located on the interface module, along with the central CEF

engine located on the supervisor engine's PFC daughter card and central CEF forwarding tables located on the

supervisor engine. The interface module makes high-volume forwarding decisions locally, and the supervisor

engine makes the rest of the forwarding decisions centrally. For more information see

Express Forwarding (aCEF)

• Distributed Cisco Express Forwarding (dCEF)—Suited for the most demanding environments, this technology

uses the dCEF engine located on the interface module's distributed forwarding card (DFC) daughter card and the

dCEF table, a local copy of the supervisor engine's central CEF table located on the interface module's DFC. The

interface module makes all the forwarding decisions locally, and provides maximum performance and scalability.

For more information see

Cisco Catalyst 6500 Series Switching Architectures

Cisco developed the following switching architectures for Cisco Catalyst 6500 modules to allow platforms to scale

in any deployment:

• 32-Gbps bus—Allowing access to a central shared bus

• 256-Gbps switch fabric—Located on the switch fabric module (SFM)

• 720 Gbps switch fabric—Located on Cisco Catalyst 6500 Series Supervisor Engine 720

How Cisco Express Forwarding

Works.

How Distributed Cisco Express Forwarding (dCEF)

Cisco Systems, Inc.

Page 9 of 29

Works.

How Accelerated Cisco

Works.