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FDDINetworkArchitecture 55

FDDINetworkArchitecture

A typical FDDI network is based on a dual, counter-rotating ring, as illustrated

in Figure 6-3. Each FDDI station is connected in sequence to two rings

simultaneously—a primary ring and a secondary ring. Data flows in one

direction on the primary ring, and in the other direction on the secondary ring.

Figure 6-3 Basic FDDI Network Architecture

The secondary ring serves as a redundant path. It is used during station

initialization, and may be used as a backup to the primary ring in the event of

a station or cable failure. When a failure occurs, the dual-ring is “wrapped”

around to isolate the fault and to create a single, one-way ring. The

components of a typical FDDI network and the failure recovery mechanism are

described in more detail in the following sections.

FDDI station

FDDI station FDDI station

FDDI station

Primary ring

Secondary ring

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Sun-microsystems 1.0 Manual do Utilizador Página 81