
Using Transparent Bridge Services
114060 Rev. A 1-7
Figure 1-6. Ethernet/802.3 to FDDI Translation
The translation process from the FDDI LAN to Ethernet/802.3 LAN (the process
Bridge B performs in Figures 1-
5 and 1-6) is a mirror image of the translation
process occurring on Bridge A, with one exception: the bridge translates an
AppleTalk ARP frame that originates on the FDDI LAN and is destined for an
Ethernet/802.3 LAN as shown in Figure
1-7.
DA SA LEN DSAP SSAP CTL DATA FCS
DA SA DSAP SSAP CTL DATA FCS
From 802.3 LAN
Through Bridge A to FDDI LAN
802.3 to FDDI Translation
Bridge A
• Extracts addressing information from the 802.3 header
• Incorporates address information into newly generated FDDI MAC header with no length (LEN) field.
• Encapsulates 802.3 data within FDDI frame.
• Recalculates FCS.
Bridge B
Ethernet LAN1 Ethernet LAN2
FDDI LAN
Bridge A
BRG0004A
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