AC206-DS02-R View Datasheet(PDF) - Broadcom Corporation
Part Name
Description
MFG CO.
'AC206-DS02-R' PDF : 70 Pages View PDF
AC206
Preliminary Data Sheet
07/08/02
LEARNING PROCESS
The address learning process is composed of the SA packets and the addressing algorithm described above. The bridge
checks each incoming packets integrity and buffers availability. If a packet is error-free and the buffer is available, the SA/port
number pair of the packet is written into the address lookup table. The following figure describes the general operations of
address learning and recognition.
DA or SA
Xor Hashing Function
[9:0]
Address
Entry Point
AAA-1
AAA
AAA+1
Address Lookup Table
Figure 3: Address Learning and Recognition
AGING TIME
The switch automatically examines the status of address lookup table. The round robin speed and checking timer are
dependent on the aging time. The switch aging time is set at 300s. When the aging timer is started after power on, the switch
guaranties that free spaces can be released from occupied address entries.
FORWARDING SCHEME
The store-and-forward algorithm is used. The incoming packet has to be completely stored in the buffer and verified error-
free before forwarding operations take place.
Broadcom
Page 10 Addressing Algorithm, Routing, Learning and Aging
Document AC206-DS05-405-R
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