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Configuring Bridging Services
1-2
114060 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. Refer to The
Translation Process later in this chapter 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 endstation addresses by reading the source address
of the endstation 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.
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 Addr LAN
Bridge
BRG0001A
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