3com 5000 ATM Manual De Usuario
2-2
C
HAPTER
2: LAN E
MULATION
O
VERVIEW
Figure 2-1 LAN Emulation Function
The ATM Backbone SwitchModule provides a LAN emulation bridge between
an ATM network and a standard Ethernet-based SwitchModule (Figure 2-2).
an ATM network and a standard Ethernet-based SwitchModule (Figure 2-2).
Figure 2-2 ATM Backbone SwitchModule Function
The ATM Backbone SwitchModule accepts Ethernet and FDDI source
packets from the SwitchModule over the CoreBuilder 5000
PacketChannel backplane and converts the packets to ATM cells for
forwarding to the ATM backbone.
packets from the SwitchModule over the CoreBuilder 5000
PacketChannel backplane and converts the packets to ATM cells for
forwarding to the ATM backbone.
Conversely, ATM cells received by the ATM Backbone SwitchModule
from the ATM backbone are converted to Ethernet packets and sent
over the CoreBuilder 5000 PacketChannel backplane to the destination
SwitchModule.
from the ATM backbone are converted to Ethernet packets and sent
over the CoreBuilder 5000 PacketChannel backplane to the destination
SwitchModule.
ATM backbone
network
network
Legacy
LAN
LAN
Legacy
LAN
LAN
LAN emulation (LANE)
bridges
bridges
ATM
Backbone
SwitchModule
ATM
network
SwitchModule
Emulated LAN
(ELAN)
Virtual Bridge
(vbridge)