Dell PowerConnect B-FCXs Configuration Manual page 281

FIGURE 33
The handshake that occurs between Switch 60 and Switch 100 follows the one described in the
previous section
becomes a non-root bridge and establishes a Root port
However, since Switch 200 already had a Root port in a forwarding state, 802.1W uses the
Proposing -> Proposed -> Sync and Reroot -> Sync and Rerooted -> Rerooted and Synced ->
Agreed handshake:
•
PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Addition of a new root bridge
Switch 100
Port1
Designated port
Port1
Root port
Switch 200
Port2
Port2
Switch 300
("Handshake when no root port is elected"
Proposing and Proposed – The Designated port on the new root bridge (Port4/Switch 60)
sends an RST BPDU that contains a proposing signal to Port4/Switch 200 to inform the port
that it is ready to put itself in a forwarding state
that the RST BPDU that Port4/Switch 200 received is superior to what it can generate, so
Port4/Switch 200 assumes a Root port role.
Configuring STP related features
Port2
Port4
Port3
Port3
Switch 400
(Figure
Port2
Designated
port
Switch 60
on page 234). The former root bridge
(Figure 34).
34). 802.1W algorithm determines
8
Port4
Designated port
239