Brocade TurboIron 24X Series Configuration Guide - Manual (Page 570)

536 Brocade TurboIron 24X Series Configuration Guide
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Configuring STP related features
Handshake when a root port has been elected
If a non-root bridge already has a Root port, 802.1W uses a different type of handshake. For
example, in
Figure 71 , a new root bridge is added to the topology.
FIGURE 71 Addition of a new root bridge
The handshake that occurs between Switch 60 and Switch 100 follows the one described in the
previous section (
“Handshake when no root port is elected” on page 531). The former root bridge
becomes a non-root bridge and establishes a Root port ( Figure 72 ).
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:
Switch 100
Port2
Designated
port
Switch 60
Port4
Designated port
Port2
Port1
Root port
Port4
Port3 Port2
Switch 200
Port2 Port3
Switch 300 Switch 400
Port1
Designated port