Dell PowerConnect B-RX Configuration Manual page 430

13
State machines
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
FIGURE 47
Switch 300
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, RSTP uses the Proposing
-> Proposed -> Sync and Reroot -> Sync and Rerooted -> Rerooted and Synced -> Agreed
handshake:
358
47, a new root bridge is added to the topology.
Addition of a new root bridge
Switch 100
Port1
Designated port
Port1
Root port
Switch 200
Port2 Port3
Port2
("Handshake when no root port is elected"
Port2
Designated
port
Port2
Port4
Port3
Switch 400
on page 353). The former root bridge
(Figure 48).
BigIron RX Series Configuration Guide
Switch 60
Port4
Designated port
53-1001810-01