BCM5670_ データシートの表示（PDF） - Broadcom Corporation

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BCM5670_

A Scalable Approach to Gigabit Ethernet

Broadcom Corporation 

White Paper

06/27/02

■ BCM567x/BCM569x

WHAT TO BUILD AND HOW TO BUILD IT

There are many types of Gigabit Ethernet switches that a designer might elect to build, depending on the enterprise

applications the switch vendor wishes to support. A switch vendor might focus on building a particular type of system that

addresses the needs of a specific customer environment or application. A vendor might design and manufacture a family of

switches to satisfy a range of business customer applications, such as a large enterprise’s wiring closet, campus backbone,

and small branch office.

TYPES OF SYSTEMS

List below, are some of the types of switches that a switch vendor can design with the XGS Product Family

Stackable Switches. These connect user desktops to the high-speed campus backbone. These highly scalable

switches contain some number of Gigabit Ethernet or Fast Ethernet “user” ports. Traffic from these ports is aggregated over

a HiGig uplink for connectivity to corporate data resources in servers and, increasingly, to call servers or IP PBXs for VoIP

applications. Stackables are often found in the wiring closet network segment to accommodate a growing user base. As

additional users join the network, more ports can be added by “stacking” additional switches on top of one another with a

common external interconnect; in effect, creating one big integrated switch.

Chassis-based Switches. This form factor is generally deployed in highly resilient backbone applications. These

systems contain slots that can be used for redundant line cards, including system buses, power supplies, and security. They

can be configured with redundant components to the degree deemed appropriate for the redundancy and manageability

required for the installation.

Integrated Switch/Servers. This configuration combines application and data servers with network switches, thus

allowing very high-speed server interconnections. In this configuration, server blades are generally interconnected across a

GE switch backplane. SerDes support in StrataXGS chips plays a large role in this application, enabling high-speed

connections across the backplane. The integrated switch/server form factor generally appeals to end customers looking for

very high-speed server connectivity while wishing to collapse functions into a single device to reduce capital costs and

management complexity.

Standalone or “Fixed” Switches. These are most often used in small/medium-sized enterprise applications, where

high growth is not expected. These systems arrive with a fixed number of ports. In order for the customer to accommodate

additional users beyond the number of ports in that switch, additional systems must be purchased.

Unmanaged Switches. This form factor represents the simplest of the devices and operates only at Layer 2, which

reduces software development and makes use of low-cost CPU interfaces. These switches are generally installed in small

environments with no IT support and where packet classification/prioritization for VoIP or high-priority data applications is

not required.

Document 567x_569x-WP100-R

Broadcom Corporation

What to Build and How to Build It Page 7

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