Configuration Guide User guide

FastIron Configuration Guide 1117
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STP feature configuration
• Sync – Once the Root port is elected, it sets a sync signal on all the ports on the bridge. The
signal tells the ports to synchronize their roles and states (Figure 130). Ports that are non-edge
ports with a role of Designated port change into a discarding state. These ports have to
negotiate with their peer ports to establish their new roles and states.
FIGURE 130 Sync stage
BigIron
Switch 100
Root Bridge
Port1
Designated port
Port1
Root port
Sync
Switch 200
Switch 300 Switch 400
Port2
Sync
Discarding
Port3
Sync
Discarding
Port2
Port3
Indicates a signal