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240 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring STP related features
8
FIGURE 34 New root bridge sending a proposal flag
• 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 35).
Switch 100
Port2
Designated
port
Switch 60
Port1
Port2
Root port
Handshake
Completed
Port4
Designated port
Proposing
Proposing
Port1
Root port
Forwarding
RST BPDU
sent with
a Proposing
flag
Port4
Designated port
Proposed
Switch 200
Port2
Port3
Port2
Port3
Switch 300
Switch 400