System information

FDDI Technology Basics
Book Title
5-68
figure, when Station 3 fails, the dual ring is automatically wrapped in Stations 2 and 4, forming a
single ring. Although Station 3 is no longer on the ring, network operation continues for the
remaining stations.
Figure 5-4 Station Failure, Ring Recovery Configuration
Figure 5-5 shows how FDDI compensates for a wiring failure. Stations 3 and 4 wrap the ring within
themselves when wiring between them fails.
Figure 5-5 Failed Wiring, Ring Recovery Configuration
Station 1
Station 3
Failed station
Station 2Station 4
Ring wrap Ring wrap
B
B
A
A
B
A
AB
MAC
MACMAC
Station 1
Station 3
Station 2Station 4
Ring wrap
Ring wrap
B
B
A
A
B
A
AB
MAC
MAC
MACMAC
Failed wiring