Bay Networks 5000 Manual de usuario descargar pdf (Pagina 9)

FEATURES

Scalable Architecture

For Sustained Performance

Every Centillion LAN-ATM chassis is

based on the ultra high-performance

Centillion architecture (see Figure 5),

leveraging parallel switching intelli-

gence distributed between a 3.2 Gbps

ATM backplane and multiple 1.2 Gbps

switching modules. Whenever trafﬁc

ﬂows from one port to another

within the same switching module,

it is forwarded locally in native

mode by a ﬂexible, high-capacity

switching engine.

Contention between user information

and signaling/control trafﬁc is prevented

by the Centillion management bus.

The management bus operates

separately from the ATM backplane

at 400 Mbps. In direct contrast to

products based on centralized

architectures, Centillion distributed

processing reserves core ATM band-

width exclusively for inter-module

trafﬁc, sustaining performance as

port densities and trafﬁc increase.

The System 5000BH chassis houses

two 3.2 Gbps backplanes and

accommodates up to twelve switching

modules. Table 1 outlines the overall

switching capacities of each of the

Centillion LAN-ATM platforms.

Distributed processing also scales the

segmentation and reassembly (SAR)

performance of Centillion LAN-ATM

platforms. Each EtherSpeed and

TokenSpeed switching module features

an onboard ATM SAR engine to

convert cross-module trafﬁc into cell

streams for transport over the ATM

core fabric. Packet-to-cell conversion

occurs only once, delivering a low-

latency, high-performance solution.

Most importantly, overall segmentation

and reassembly capabilities increase

as switching modules are added to

ensure sustained performance as

network demands grow (see Table 1).

The distributed nature of Centillion

LAN-ATM technology also enables

the addition of powerful new soft-

ware features—such as MPOA

intranet application intelligence—

without expensive hardware upgrades.

Flexible, Modular Connectivity

The Centillion switching modules

provide comprehensive support for

integrated Ethernet, Fast Ethernet,

Token Ring, and ATM connectivity

across the enterprise. All modules

feature input/output ports, buffer

memory, and CellManager

™

ASICs,

as shown in Figure 5. EtherSpeed and

TokenSpeed modules provide local

frame switching via high performance

Data Sheet Centillion 50, Centillion 100 and System 5000BH Switches 9

PLATFORM CAPACITIES

Table 1: Centillion LAN-ATM Platform Capacities

Switching Backplane Total Switching Total Segmentation &

Platform Capacity Capacity Reassembly Capacity

Centillion 50 3.2 Gbps 6 Gbps 800 Mbps

Centillion 100 3.2 Gbps 10 Gbps 2 Gbps

System 5005BH 3.2 Gbps 10 Gbps 2 Gbps

System 5000BH/BHC 6.4 Gbps 20 Gbps 4 Gbps

Figure 5: Centillion LAN-ATM Integration.

3.2 Gbps ATM Bus

Control Bus

4/16/32

Token Ring Ports

Switch Engine

SAR

CellManager

10/100 Ethernet Ports

Switch Engine

SAR

CellManager

Cell Manager

SAR

Switch Engine

10/100 Ethernet Ports

Cell Manager

SAR

Switch Engine

4/16/32

Token Ring Ports

OC-3/OC-12

ATM Ports

CellManager

Cell Manager

OC-3/OC-12

ATM Ports

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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