LAN Emulation Connections 2-7
LAN Emulation Connections
LAN emulation uses VCCs (virtual channel connections) to provide
communications between a LEC and the LANE service.
There are two types of VCCs:
■Control VCCs
■Data VCCs
Control VCCs Control VCCs consist of t he following three types:
■Configuration Direct VCC — A bidirectional point-to-point VCC
from the LEC to the LECS
■Control Direct VCC — A bidirectional VCC from the LEC to the LES
■Control Distribute VCC — A unidirectional VCC from the LES to
the LEC; typically, a point-to-multipoint connection from the LES to
multiple LECs
Figure 2-7 illustrates the function of the three types of Control VCCs in
ATM Backbone SwitchModule LAN emulation.
Figure2- 7 Control VCCs in ATM Backbone SwitchModule LAN Emulation
ATM Backbone
SwitchModule
LAN Emulation Server
(LES)
LAN Emulation
Configuration Server
(LECS) Configuration Direct VCC
Control Distribute VCC
Control Direct VCC
Bridgeport-
LEC