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Basic ATM Concepts
US7070447-001, Rev 01
11-3
Draft Level—Hitachi Confidential
The components of an Emulated LAN (ELAN) consists of the following:
❒ LAN Emulation Client (LEC)
❒ LAN Emulation Configuration Server (LECS)
❒ LAN Emulation Server (LES)
❒ Broadcast and Unknown Server (BUS)
LAN Emulation Client (LEC)
The LAN Emulation Client (LEC) resides on the HiSpeed switch and acts as a
proxy for devices connected to the Ethernet ports. In addition, the LEC responds
to any LAN Emulation Address Resolution Protocol (LE_ARP) requests from
host machines on the network.
LAN Emulation Confi
g
uration Server
The LAN Emulation Configuration Server (LECS) provides the LEC with the
ATM address of the LAN Emulation Server (LES) to join an ELAN. It also
provides the LEC with configuration information. The LEC can connect to the
LECS in one of three ways:
❒ Use ILMI
❒ Use the LECS well-known address:
47007900000000000000000000:00A03E000001:00
❒ Use a Config Direct VCC of 0.17 (one for each ELAN)
LAN Emulation Server (LES)
The LES registers and resolves MAC addresses to ATM addresses within the
ELAN. The LES forwards the LEC response and helps the LEC locate the BUS,
by responding to the LE_ARP request from the LEC.
Broadcast and Unknown Server (BUS)
The BUS forwards all broadcasts, multicast and unknown unicast traffic to all
attached LAN Emulation Clients (LECs).