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Configuring Bridging Services
1-2
117351-A Rev. A
A transparent bridge also provides some translation services, converting frames
for bridging between Ethernet/802.3 LANs and Fiber Distributed Data Interface
(FDDI) LANs. See T
he Translation Process on page 1-3 for details on translation
services.
How the Bridge Works
The bridge receives and examines every frame transmitted on the networks to
which it is attached. It learns end station addresses by reading the source address
of the end station that transmitted the frame and noting which LAN interface
received the frame. The bridge enters this information into a data structure called
the
forwarding table
, which the bridge constantly updates.
For example, in Figure 1-1, if node 2 transmits a frame onto the network for the
first time, the bridge receives the frame and makes an update to its forwarding
table. The bridge notes that node 2 is in the direction of LAN A.
The bridge then forwards (relays to another network) or drops (discards) the frame
based on the forwarding table entries.
Figure 1-1. Forwarding Table Update
Node 1
MAC address=
00:00:A2:00:00:01
Node 4
MAC address=
00:00:A2:00:00:04
LAN B
LAN A
Node 2
MAC address=
Node 3
MAC address=
A
B
B
A
Update
00:00:A2:00:00:02 00:00:A2:00:00:03
00:00:A2:00:00:02
00:00:A2:00:00:03
00:00:A2:00:00:04
00:00:A2:00:00:01
Forwarding table
Node MAC address LAN
Bridge
BRG0001A
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