
Using Transparent Bridge Services
114060 Rev. A 1-9
Figure 1-8. Parallel Bridge Topology
When Endstation J initially sends a frame to Endstation K, both Bridge 1 and
Bridge 2 read the frame. Since this is the first frame sent between J and K, there is
no forwarding table entry for J or K on either of the bridges. Each bridge updates
its forwarding table to indicate that Endstation J is in the direction of LAN A.
Then, each bridge floods the frame: Bridge 1 forwards the frame over Interface 1
and Bridge 2 forwards the frame over Interface 2. Bridge 2 also forwards the
frame over Interface 3; however, to simplify the example, we do not trace this
frame.
LAN C
LAN B
LAN A
ES = Endstation
BR = Bridge
IF = Interface
Key
IF 1
IF 2
IF 3
BR 3
BR 2BR 1
BR 4
ES J
ES K
IF 4
IF 5
IF 6
IF 7
IF 8
IF 9
LAN D
BRG0006A
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