3Com 5000 ATM manual LAN Emulation Connections, Control VCCs

LAN Emulation Connections 2-7

LAN Emulation Connections

Control VCCs

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 consist of the 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.

Control Direct VCC

LAN Emulation Server (LES)

Control Distribute VCC

LAN Emulation

Configuration Server

ATM Backbone

SwitchModule

Bridgeport-

LEC

(LECS)

Configuration Direct VCC

Figure 2-7Control VCCs in ATM Backbone SwitchModule LAN Emulation