Avaya Configuring ATM and MPLS Services Manual de usuario Pagina 65

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM
117374-C Rev 00
1-35
Broadcast and Unknown Server
To emulate a traditional LAN, the emulated LAN must provide the connectionless
data delivery of a shared network to its LE clients and be able to handle broadcast
and multicast data. The broadcast and unknown server (BUS) fulfills this
requirement by distributing all broadcast, multicast, and unknown traffic to and
from all LE clients on an emulated LAN.
For example, when an LE client sets up its initial configuration, it obtains the
MAC address of the BUS from the LES. Using this MAC address, the LE client
sets up a multicast send virtual channel connection (VCC) to the BUS. In turn, the
BUS registers the LE client as part of its emulated LAN.
To broadcast data, an LE client uses the multicast send VCC to transmit
information to the BUS. The BUS then retransmits the data, through multiple
point-to-point connections or one point-to-multipoint connection, to each LE
client on the emulated LAN.
Redundant LES/BUS
Bay Networks ATM routers support LAN emulation server (LES) and broadcast
and unknown server (BUS) redundancy. This redundancy reduces the risk of
network failure by overcoming a single point of failure in accessing the LES.
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