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2-4
C
HAPTER
2: LAN E
MULATION
O
VERVIEW
Broadcast and Unknown Server (BUS)
The Broadcast and Unknown Server is a multicast server that forwards
multicast and broadcast traffic to LECs within a specific ELAN. The BUS
also floods unknown unicast traffic to all LECs in the ELAN.
ATM Backbone
SwitchModule LANE
Components
Implementation of the LAN emulation components in the ATM
Backbone SwitchModule is illustrated in Figure 2-4.
Figure 2-4
ATM Backbone SwitchModule LANE Components
In addition to the standard LANE service components (see Figure 2-3),
the ATM Backbone SwitchModule includes the following components:
Bridgeport-LEC
You define up to 64 bridgeport-LECs for each ATM Backbone
SwitchModule. A bridgeport-LEC is both a standard ATM LEC that you
assign to an emulated LAN and a bridgeport that you assign to a virtual
bridge.
ATM
network
Emulated LAN
(ELAN)
Virtual bridge
(Vbridge)
Bridgeport-LEC
(up to 64)
LANE
service
ATM Backbone SwitchModule
Ethernet or FDDI
SwitchModule
ATM OC-3 card