Configuration Guide User guide

1122 FastIron Configuration Guide
53-1002494-02
STP feature configuration
• Sync and Reroot – The Root port then asserts a sync and a reroot signal on all the ports on the
bridge. The signal tells the ports that a new Root port has been assigned and they are to
renegotiate their new roles and states. The other ports on the bridge assert their sync and
reroot signals. Information about the old Root port is discarded from all ports. Designated
ports change into discarding states (Figure 135).
FIGURE 135 Sync and reroot
BigIron
Switch 100
Port2
Root port
Port2
Designated
port
Port1
Switch 60
Port4
Designated port
Proposing
Proposing
Port1
Root port
Sync
Reroot
Forwarding
Port4
Root port
Sync
Reroot
Discarding
Port3
Sync
Reroot
Discarding
Port2
Sync
Reroot
Discarding
Switch 200
Switch 300
Switch 400
Port2
Port3
Indicates a signal