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Using Transparent Bridge Services

117351-B Rev. 00

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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Avaya Configuring Bridging Services Manual do Utilizador Página 31