Allied Telesis AT-9000/52, AT-9000/28SP manual Auto

Chapter 7: Setting the Port Spanning Tree Protocol

Path Cost (1-200000000)— Use this field to specify the cost of a port to the root bridge. This cost is combined with the costs of the other ports in the path to the root bridge, to determine the total path cost. The lower the numeric value, the higher the priority of the path. The range is 6 to 40.

Priority (0-15) (Actual value is multiple of 16)— Indicates a bridge priority number for the switch. The device with the lowest priority number in the spanning tree domain becomes the root bridge. If two or more devices have the same priority value, the device with the numerically lowest MAC address becomes the root bridge.

Edge Port— Designates the edge ports on the switch. Choose “Yes” to active an edge type or “No” to make an edge port inactive. 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— Choose from the following settings:

AUTO	If a port is set to full-duplex mode,
	AUTO indicates the Link Type is point-
	to-point. If a port is set to half-duplex
	mode, AUTO indicates the Link Type is
	shared.
PTP (point-to-point)	Allows for rapid transition of a port to
	the forwarding state during the
	convergence process of the spanning
	tree domain.
Shared	Disables rapid transition of a port. You
	may want to set thelink type to shared
	if a port is connected to a hub with
	multiple switches connected to it.

Loop Guard— Indicates the BPDU loop-guard feature on the ports is enabled (ON) or disabled (OFF). If a port with the loop guard activated stops receiving BPDU packets, the switch automatically disables the port. 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.

6.Click Apply.

7.Click SAVE.

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