
Using Transparent Bridge Services
117351-A Rev. A 1-5
Figure 1-4. Ethernet to FDDI Translation
FCSDATA
TYPE
Through bridge A to FDDI LANtranslation from ethernet LAN
DA DA SASA
TYPE
DATA FCS
SNAP LLC OUI
AA AA 03 00 00 00
• Extracts addressing information from the ethernet header.
• Encapsulates ethernet data according to RFC 1042.
• Recalculates frame check sequence (FCS).
Bridge A
• Incorporates address information into newly generated FDDI MAC header.
FCS
DATA
TYPE
=80F3
DA SA
SNAP LLC OUI
AA AA 03 00 00 F8
translation from ethernet LAN
DA SA
TYPE
=80F3
DATA FCS
Through bridge A to FDDI LAN
Ethernet (AppleTalk ARP) to FDDI
• Extracts addressing information from the Ethernet header.
• Incorporates address information into newly generated FDDI MAC header.
• Recalculates (FCS).
Bridge A
Bridge B
Ethernet LAN1 Ethernet LAN2
FDDI LAN
=80F3
=80F3
Bridge A
Ethernet to FDDI
BRG0003A
• Encapsulates Ethernet data within IEEE 802.2H-defined SNAP header that has an
organizationally unique identifier (OUI) of 0000F8.
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