Allied Telesis AT-9000 Series - Manual (Page 92)

Chapter 7: Setting the Port Spanning Tree Protocol
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 Version— Spanning Tree Protocol version. (STP or RSTP). The
default setting is RSTP.
 Edge Port— Indicates whether there are edge ports on the switch
(Yes) or not (No). Edge ports are not connected to spanning tree
devices or to LANs that have spanning tree devices. As a
consequence, edge ports do not receive BPDUs. If an edge port
starts to receive BPDUs, it is no longer considered an edge port by
the switch.
 Link Type— Indicates whether ports are Auto, point-to-point, or
shared.
 Loop Guard— Indicates the BPDU loop-guard feature on the
ports is enabled (Yes) or disabled (No). If a port that has this
feature activated stops receiving BPDU packets, the switch
automatically disables it. A port that has been disabled by the
feature remains in that state until it begins to receive BPDU
packets again or the switch is reset. The default setting for BPDU
loop-guard on the ports is disabled.