Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 447)

Multi-Service IronWare Switching Configuration Guide 417
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State machines
13
Handshake when a root port has been elected
If a non-root bridge already has a Root port, RSTP uses a different type of handshake. For example,
in
Figure 79 , a new root bridge is added to the topology.
FIGURE 79 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” ). The former root bridge becomes a
non-root bridge and establishes a Root port ( Figure 80 ).
However, since Switch 200 already had a Root port in a forwarding state, RSTP uses the Proposing
-> Proposed -> Sync and Reroot -> Sync and Rerooted -> Rerooted and Synced -> Agreed
handshake: