HP ProCurve 9304M Installation And Configuration Manual page 244

Installation and Basic Configuration Guide
Figure 8.13 Handshake Completed After Election of New Root Port
Routing Switch 200
Proposing
Routing Switch 300
Recall that Routing Switch 200 sent the agreed flag to Port4/Routing Switch 60 and not to Port1/Routing Switch
100 (the port that connects Routing Switch 100 to Routing Switch 200). Therefore, Port1/Routing Switch 100 does
not go into forwarding state instantly. It waits until two instances of the forward delay timer expires on the port
before it goes into forwarding state.
At this point the handshake between the Routing Switch 60 and Routing Switch 200 is complete.
The remaining bridges (Routing Switch 300 and Routing Switch 400) may have to go through the reroot
handshake if a new Root port needs to be assigned.
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Routing Switch 100
Port1
Proposing
Port1
Alternate port
Port2 Port2
Port2
Port2
Designated
port
Port2
Root port
Port4
Root port
Port3
Proposing
Port3
Routing Switch 400
Routing Switch 60
Port4
Designated port