BCM5691_ Просмотр технического описания (PDF) - Broadcom Corporation
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BCM5691_ Datasheet PDF : 28 Pages
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■ BCM567x/BCM569x
White Paper
06/27/02
Another prevalent system challenge is to minimize design, assembly, and manufacturing costs. Methods for lowering total
costs are by constructing a switch using a minimum number of components, reusing chip resources and development
expertise, and using a simple board assembly.
And what about system features? To satisfy end customer requirements, switch makers must consider including most, if not
all, of the following capabilities in their products:
• Layer 2 switching with associated 802.1Q Virtual LAN (VLAN) support and 802.1p traffic classification capabilities
• Layer 3 routing
• Quality of service (QoS) for prioritizing certain traffic, such as latency-sensitive voice over IP (VoIP) packets
• Layer 2 and 3 multicasting for bandwidth-efficient point-to-multipoint transmissions
• Very high levels of resiliency and switch uptime to ensure network reliability
• A high-throughput backplane that enables wire-speed performance
• Scalability—including high port density in a small amount of board space—so end customers can grow their networks
as needed at a reasonable cost per port
• Security, such as per-port MAC address filtering, firewall filtering, and intrusion detection capabilities
• The ability to integrate features such as QoS, trunking, and port mirroring (for diagnostics) across interconnected
modules to ensure consistent performance and resiliency, end to end
All of these capabilities are supported in the Broadcom StrataXGS™ Switch Architecture from Broadcom Corporation. The
sections that follow examine the components and attributes of this modular and highly integrated architecture. The following
sections will also discuss the form factors that can be designed with the StrataXGS family—often, in conjunction with
members of Broadcom’s StrataSwitch II™ Fast Ethernet (10/100 Mbps) family—and the important decisions and design
considerations that accompany building these devices.
STRATAXGS GIGABIT ETHERNET ARCHITECTURE
REDUCED COMPONENTS
The Broadcom StrataXGS architecture has been designed so that only a small number of components are required to build
a variety of Layer 2/3 systems in different form factors that support a range of port densities. StrataXGS components support
a high level of integration, with all memory, interfaces, packet forwarding and other capabilities supported on-chip. The
integrated nature of the architecture delivers approximately a 75% reduction in the number of chips required over competing
solutions, which results in lower manufacturing costs. The reduced component count also yields higher-quality products
because of the decreased complexity; Broadcom estimates that the StrataXGS solution reduces mean time between failures
(MTBF) by about 20%.
INTEROPERABILITY WITH BROADCOM STRATASWITCH
The StrataXGS architecture is an extension to the proven Broadcom StrataSwitch II (Fast Ethernet) architecture. There are
already 20 million StrataSwitch ports deployed in the marketplace today. StrataXGS is compatible with StrataSwitch in
several ways. First, the packet flows from ingress to egress is the same. Secondly, memory management is consistent
across the two architectures. Lastly, use of the fourth-generation Broadcom Switch Application Programming Interface (API)
for enabling custom features is portable across both families.
The integrated nature of the two architectures enables designers familiar with Broadcom StrataSwitch to re-use their
engineering and development expertise, which lowers costs and expedites time to market. Switch-makers can also use both
the StrataSwitch and StrataXGS chips as building blocks in a common design to mix Fast Ethernet, Gigabit Ethernet, and
10-Gigabit Ethernet ports in standalone/fixed, chassis, stackable, server, and unmanaged switch form factors.
Broadcom Corporation
Page 2 StrataXGS Gigabit Ethernet Architecture
Document 567x_569x-WP100-R
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