
Configuring ATM Services
B-2
LAN Emulation Components
Each emulated LAN comprises a group of LAN emulation clients and three
different servers. These servers include a LAN emulation configuration server, an
LE server and a broadcast and unknown server. Each of these servers provides a
specific LAN emulation service.
LAN Emulation Clients
The LAN emulation client (LE client or LEC) is the interface, or virtual portion of
an interface, through which an endstation forwards data, resolves addresses, and
provides other control functions. The LE client provides the MAC-level emulated
Ethernet or Token Ring service interface to the higher-level software. It also
controls the LAN emulation UNI (LUNI) interface when communicating with
other devices on the emulated LAN.
LAN Emulation Configuration Server
The LAN emulation configuration server (LECS) assigns individual LE clients to
different emulated LANs. The LECS does this by giving the client the ATM
address of the LAN emulation server (LES). This method allows you to assign a
client to an emulated LAN based on the client’s physical location (ATM address)
or the identity of a LAN destination it represents.
The LE client uses the configuration protocol to obtain information from the
LECS. This configuration protocol allows the LE client to locate the LES and set
up a bidirectional control direct virtual channel connection. The LE client
automatically obtains all of the necessary configuration data (including the LES
address) from the LECS.
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