Specifications

Operations Manual
115
LAN Emulation
Client (LEC)
LEC performs address resolution, data forwarding and other control
functions. It does this by providing a MAC level emulated 802.3 or 802.5
interface to higher level software such as bridging functions. LEC
implements the LANE User-Network Interface (LUNI) with other entities
within the Emulated LAN.
In short, LEC software runs on ATM End Stations and makes them appear to
be Ethernet stations on the network.
Note that each ATM end-system can simultaneously be members of several
Emulated LANs. In these situations the End System would contain several
LECs, one for each Emulated LAN using a unique MAC address to join
different ELANs.
LEC software bridges data frames between Ethernet ports on the same
ELAN. In addition, bridge software will work with the LEC software to
allow a LEC to respond to LANE Address Resolution Protocol (ARP)
requests for end-stations behind the Ethernet interfaces and to detect
changes in the topology of any bridged network that the LEC is a member.
Packets destined to cross VLANs are filtered or discarded by the bridge. A
router should, therefore, be used to communicate between VLANs.
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