40APPENDIX B: ADMINISTERING ATM
LAN Emulation | LAN Emulation (LANE) provides unicast, multicast, and broadcast network |
| behavior over |
| 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).
