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LAN Emulation (LANE)
11-15
LAN Emulation Client (LEC) — A set of functions implemented in an ATM
endpoint which serves as an interface between it and the ATM network in
support of LAN Emulation.
LAN Emulation Server (LES) — The set of functions implemented in the
ATM network support of LAN Emulation. The LES provides address
resolution for the LECs within an Emulated LAN.
Broadcast and Unknown Server (BUS) — The set of functions
implemented in an ATM network that provides LAN-to-LAN transmission
support while a LAN connection is being established. The BUS also supports
Ethernet Broadcasts Mode by sending broadcast data to all LECs.
LAN Emulation Configuration Server (LECS) — Assigns individual LAN
Emulation clients to different emulated LANs. When a LEC initializes, it
establishes a connection to the LECS. Based on its own programming,
configuration database, and information provided by clients, the LECS
assigns any client requesting configuration information to a specific
Emulated LAN service by giving the client the LES's ATM address. This
arrangement allows a client to be assigned to an emulation LAN based on
either the physical location (ATM address) or the identity of a LAN
destination which it is representing (ELAN name).
Virtual Channel
Communication among LECs and between LECs and the LES is performed
Connections (VCC)
over ATM virtual channel connections (VCCs). Each LEC must communicate
with the LES over control and data VCCs. Emulated LANs operate in one of
three environments: switched virtual circuit (SVC), permanent virtual circuit
(PVC), or mixed SVC/PVC.
Emulated LANs
Using LAN emulation, ATM allows related users in separate physical
(ELANs)
segments to be effectively grouped into a common broadcast domain
called an emulated LAN. Each emulated LAN is independent of the others
and there is no direct communication across emulated LAN boundaries.
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