Signamax Managed Hardened PoE Industrial DIN-rail Mount Switch - Manual (Page 62)

11 Spanning Tree
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switch or network segment. Rapid transition to the forwarding state is applied to edge ports,
because no loop can be incurred by network topology change on edge ports. The spanning
tree protocol allows a port to enter the forwarding state rapidly by setting it to be an edge port,
and it is recommended to configure the Ethernet ports connected directly to user terminals as
edge ports, so that they may enter the forwarding state immediately.
Normally, configuration BPDUs cannot reach an edge port because the port is not connected
to another switch. But, in case that BPDU protection function is disabled on an edge port,
configuration BPDUs sent deliberately by a malicious user may reach the port. If an edge port
receives a BPDU, it changes itself to be a non-edge port.
Caution : RecoverRing II™ and STP cannot be configured at the same time.