Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 452)

422 Multi-Service IronWare Switching Configuration Guide
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State machines
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The old Root port on Switch 200 becomes an Alternate Port ( Figure 84 ). Other ports on that bridge
are elected to appropriate roles.
The Designated port on Switch 60 goes into a forwarding state once it receives the RST BPDU with
the agreed flag.
FIGURE 84 Handshake completed after election of new root port
Recall that Switch 200 sent the agreed flag to Port4/Switch 60 and not to Port1/Switch 100 (the
port that connects Switch 100 to Switch 200). Therefore, Port1/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 Switch 60 and Switch 200 is complete.
The remaining bridges (Switch 300 and Switch 400) may have to go through the reroot handshake
if a new Root port needs to be assigned.