HP ProCurve 9304M Installation And Configuration Manual page 243

Routing switches
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Synced and Agree – When all the ports on the bridge assert their synced signals, the new Root port asserts
its own synced signal and sends an RST BPDU to Port4/Routing Switch 60 that contains an agreed flag
(Figure 8.11). The Root port also moves into a forwarding state.
Figure 8.12
Rerooted, Synced, and Agreed
Routing Switch 200
Port2
Rerooted
Synced
Discarding
Port2
Routing Switch 300
The old Root port on Routing Switch 200 becomes an Alternate Port (Figure 8.13). Other ports on that bridge are
elected to appropriate roles.
The Designated port on Routing Switch 60 goes into a forwarding state once it receives the RST BPDU with the
agreed flag.
Configuring Spanning Tree Protocol (STP) and Advanced STP Features
Routing Switch 100
Port2
Root port
Port1
Proposing
Port1
Rerooted
Synced
Discarding
Port4
Root port
Rerooted
Synced
Forwarding
Port3
Rerooted
Synced
Discarding
Port3
Indicates a signal
Port2
Designated
port
Port4
Designated port
Forwarding
RST BPDU
sent with
an Agreed
flag
Routing Switch 400
Routing Switch 60
8 - 37

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