Using the BayStack 450 10/100/1000 Series Switch
D-4 309978-D Rev 01
LAN Emulation Configuration Server (LECS)
A LAN emulation configuration server (LECS) assigns individual LECs to
different ELANs based upon the LECS’ policies, configuration database, and the
information that is provided by the LEC.
The LECS assigns the LEC to an ELAN by giving the LEC the ATM address of
the LAN emulation server (LES) that is providing services for that specific ELAN
(see
“LAN Emulation Server (LES)” on page D-4).
In Figure D-1 on page D-2, the LECS assigns LEC1 to the ELAN (shaded blocks)
by providing LEC1 with the ATM address of the LES that is providing the service
for that ELAN.
For more information about LECS, refer to the ATM Forum Technical Committee
LAN Emulation Over ATM Version 1.0 specification.
LAN Emulation Server (LES)
A LAN emulation server (LES) implements the control coordination function for
the ELAN. The LES registers and resolves MAC addresses and route descriptors
to ATM addresses, and may register its LAN destinations with the LECS.
A LEC also queries the LES when it wants to resolve a MAC address or route
descriptor to an ATM address. The LES either responds directly to the LEC or
forwards the query to other LECs so that they may respond.
For more information about LES, refer to the ATM Forum Technical Committee
LAN Emulation Over ATM Version 1.0 specification.
Broadcast and Unknown Server (BUS)
The broadcast and unknown server (BUS) handles data sent by a LEC to the
broadcast MAC address, all multicast traffic, and initial unicast frames that are
sent by a LEC before the data direct target ATM address has been resolved (before
a data direct VCC has been established).
This BUS must always exist in the ELAN and all LECs must join its distribution
group.
For more information about BUS, refer to the ATM Forum Technical Committee
LAN Emulation Over ATM Version 1.0 specification.
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