40APPENDIX B: ADMINISTERING ATM

LAN Emulation

LAN Emulation (LANE) provides unicast, multicast, and broadcast network

 

behavior over connection-oriented ATM. An emulated LAN (ELAN) can

 

consist of many LAN emulation clients (LECs). An ELAN consists of the

 

following components:

 

A Broadcast and Unknown Server (BUS) — Responsible for

 

handling broadcast, multicast, and initial unicast frames sent from a

 

LAN Emulation Client. Each ELAN contains only one BUS.

 

A LAN Emulation Server (LES) — Responsible for registering and

 

resolving MAC addresses to ATM addresses for LECs. Each ELAN

 

contains only one LES.

 

LAN Emulation Clients (LECs) — The end node from the perspective

 

of the ATM network. It performs data forwarding, address resolution,

 

and other control functions. Additionally, it maintains the LAN

 

emulation software.

 

A LAN Emulation Configuration Server (LECS) — The LECS

 

provides configuration information about the ATM and LAN networks.

 

It also provides the address of the LES to the LEC.

Important considerations:

You must define a LES and a BUS as part of an ELAN before you can define a LEC.

You can configure the LES and the BUS on the same LEC or on different LECs.

Creating an You can create an 802.3 emulated LAN on ATM by defining the LAN’s Emulated LAN servers (the BUS and the LES) and then configuring each LAN Emulation

Client (LEC).

To create an emulated LAN, follow these steps:

1Determine the location of the BUS and LES.

You can define the BUS and LES in any LEC on the network, or on an ATM switch, such as the 3Com CoreBuilder 7000 system.

2Define the Broadcast and Unknown Server (BUS).

3Define the LAN Emulation Server (LES).

4Define the LAN Emulation Clients (LEC).

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3Com Version 8.1.2 manual LAN Emulation, Broadcast and Unknown Server BUS Responsible for

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