3com 5000 ATM Manual De Usuario
LAN Emulation Data Exchange
2-5
Virtual Bridge (vbridge)
You create virtual bridges on CoreBuilder 5000 SwitchModules. You
assign each bridgeport-LEC to a vbridge on a SwitchModule in the
CoreBuilder 5000 hub.
assign each bridgeport-LEC to a vbridge on a SwitchModule in the
CoreBuilder 5000 hub.
Emulated LAN (ELAN)
You assign each bridgeport-LEC to an ELAN in the ATM network. An
ELAN is a logical LAN grouping of LECs within an ATM network.
ELAN is a logical LAN grouping of LECs within an ATM network.
LAN Emulation
Data Exchange
Data Exchange
This section identifies important characteristics of data exchange
between a SwitchModule and an ATM network.
between a SwitchModule and an ATM network.
Protocol Stacks
The LAN emulation protocol stacks used in the exchange of data
between a SwitchModule-based LAN and ATM host are shown in
Figure 2-5.
between a SwitchModule-based LAN and ATM host are shown in
Figure 2-5.
Figure 2-5 LAN Emulation Protocol Stacks
Physical layer
Physical
Physical layer
Physical
ATM
AAL5
LAN
emulation
emulation
Bridging
MAC
MAC
Network interface
driver
driver
Existing applications
Physical
Physical
ATM
Existing applications
ATM
AAL5
LAN emulation
Ethernet/FDDI host
ATM Backbone SwitchModule
and Ethernet SwitchModule
and Ethernet SwitchModule
ATM switch
ATM host
Network interface
driver
driver