3com 5000 ATM Manuale Utente
LAN Emulation Connections
2-7
LAN Emulation
Connections
Connections
LAN emulation uses VCCs (virtual channel connections) to provide
communications between a LEC and the LANE service.
communications between a LEC and the LANE service.
There are two types of VCCs:
■
■
Control VCCs
Control VCCs consist of the following three types:
■
Configuration Direct VCC — A bidirectional point-to-point VCC
from the LEC to the LECS
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
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.
ATM Backbone SwitchModule LAN emulation.
Figure 2-7 Control VCCs in ATM Backbone SwitchModule LAN Emulation
ATM Backbone
SwitchModule
SwitchModule
LAN Emulation Server
(LES)
(LES)
LAN Emulation
Configuration Server
(LECS)
Configuration Server
(LECS)
Configuration Direct VCC
Control Distribute VCC
Control Direct VCC
Bridgeport-
LEC
LEC