
Configuring Bridging Services
1-6 114060 Rev. A
Figure 1-5. FDDI to Ethernet Translation
Bridge B
Ethernet LAN1 Ethernet LAN2
FDDI LAN
Bridge A
BRG0028A
FCSDATA
TYPE
DA SA
SNAP LLC OUI
AA AA 03 00 00 00 =80F3
DA SA
TYPE
DATA FCS
=80F3
Through Bridge B to Ethernet LAN
From FDDI LAN
• Extracts addressing information from the FDDI header.
• Removes RFC 1042 from Ethernet data.
• Recalculates frame check sequence (FCS).
Bridge B
• Incorporates address information into newly generated Ethernet MAC header.
FCS
DATA
TYPE
=80F3
DA SA
SNAP LLC OUI
AA AA 03 00 00 F8
DA SA
TYPE
=80F3
DATA FCS
From FDDI LAN
Through Bridge B to Ethernet LAN
FDDI to Ethernet (AppleTalk ARP) Translation
• Extracts addressing information from the FDDI header.
• Incorporates address information into newly generated Ethernet MAC header.
• Removes Ethernet data from an IEEE 802.2H-defined SNAP header that has an
organizationally unique identifier (OUI) of 0000F8.
• Recalculates FCS.
Bridge B
FDDI to Ethernet Translation
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