Brocade TurboIron 24X Series Configuration Guide - Manual (Page 571)

Brocade TurboIron 24X Series Configuration Guide 537
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Configuring STP related features
• 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 (
Figure 72 ). 802.1W algorithm determines
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.
FIGURE 72 New root bridge sending a proposal flag
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