Avaya Configuring Bridging Services Manual de usuario Pagina 30

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Configuring Bridging Services
1-6
117351-B Rev. 00
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 F CS
=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 F CS
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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