3Com CoreBuilder 7000, Operation Manual

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28 C
HAPTER
1: ATM N
ETWORK
B
ASICS
Building LAN Emulation ATM Networks
A LAN Emulation network provides the ability to run network applications
over ATM and maintain the legacy LANs’ well-established environment.
The following network devices support LAN Emulation:
A CoreBuilder 7000 ATM family switch provides the LAN Emulation
services LES and LECS.
An ATM edge device:
SuperStack II Switch 2700 unit — for Ethernet
SuperStack II Switch 2000 — for Token Ring
SuperStack II Switch 2500 — for FDDI converts ATM to LAN and
supports multiple LAN Emulation Clients.
An ATM adapter (for example, a ATMLink S-Bus 155) supports a LAN
Emulation Client for servers or end stations. To support more than one
Emulated LAN a client can have multiple adapters or multiple LECs.
Router with ATM downlink — the ATM connection supports multiple
LAN Emulation clients (NETBuilder II).
A CoreBuilder 2500 — supports FDDI rings
Enterprise Network This section describes the power, modularity, and
flexibility of the CoreBuilder 7000 family ATM switches in a large-scale
enterprise network consisting of headquarters offices, regional offices
and branch offices. The following features of the CoreBuilder 7000 are
shown:
Form redundant network core to fit required bandwidth
Serve as edge device
Support Ethernet and Token Ring LANs simultaneously
Serve as Fast Ethernet switch
Provide high-density switched Ethernet
Consolidate voice, video and data into single low-cost transmission
Establish LANE services between networks over WAN VP switch.
Headquarters Network Core Figure 6 shows a CoreBuilder 7000
family ATM switch network that is deployed in an enterprise
headquarters network core consisting of four CoreBuilder 7000HD ATM
switches redundantly connected via OC-12 connections. The core is
located in the basement Data Center. Figure 6 illustrates the use of