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FDDINetworkArchitecture 61

This failure recovery mechanism is only supported by dual-attached stations

and concentrators; a single-attached station connected directly to the ring

cannot wrap around the fault because it is only connected to one ring at a time.

The effect of a cable or link failure on a basic FDDI network is very similar to a

station failure, as shown in Figure 6-9. The SMT entities on the stations on

either side of the failed connection reconfigure the network dynamically so

that the primary ring is wrapped onto the secondary ring.

Figure 6-9 Isolating a Single Cable Failure

Wrapping occurs within the MAC layer. Figure 6-10 on page 62 illustrates how

the dual-attached station is reconfigured to wrap the primary ring onto the

secondary ring. Dual-attached concentrators wrap in a similar way. In this

case, all of the single-attached stations connected to the concentrator are also

wrapped onto the secondary ring.

Secondary ring

Primary ring

FDDI DAS

Failed cable

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Sun-microsystems 1.0 Bedienungsanleitung Seite 87