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266 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring STP related features
8
FIGURE 49 802.1W Draft 3 RSTP ready for failover
If the root port on a Switch becomes unavailable, 802.1W Draft 3 immediately fails over to the
alternate port, as shown in Figure 50.
Switch 1
Switch 2
Switch 4
Switch 3
Root Bridge
Bridge priority = 2
Bridge priority = 4
Root port = 2/2
Alternate = 2/3, 2/4
Bridge priority = 8
Root port = 4/4
Alternate = 4/3
Bridge priority = 6
Root port = 3/3
Alternate = 3/4
Port1/2
FWD
Port1/4
FWD
Port1/3
FWD
Port3/3
FWD
Port3/4
BLK
Port4/4
FWD
Port4/3
BLK
Port2/3
FWD
Port2/4
FWD
Port2/2
FWD
The arrow shows the path
to the root bridge