HP V1910 User Manual page 216

If the device is not enabled with BPDU guard, when a boundary port receives a BPDU from another

port, it converts into a non-boundary port. To restore its port role as a boundary port, you need to
restart the port.
Configure ports that are directly connected to terminals as boundary ports and enable BPDU guard for

them. These ports can rapidly transit to the forwarding state, and the network security can be ensured.
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