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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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#### STP Cost Overview

When a loop occurs in the network topology, you can use the STP path cost to determine the spanning-tree states of the ports. Path cost is obtained from the speed of the interface. You can configure a lower path cost for an interface if the port needs to be selected first. Alternatively, you can configure a higher path cost if the port needs to be selected last to place it in forwarding state.

Path cost is used to determine the topology only if the loop in the network cannot be resolved using only the bridge IDs. If all ports have the same path cost values, the lowest numbered port is put into forwarding state by the spanning tree first.

Valid interfaces include physical interfaces and port-channel logical interfaces (`port-channel` port-channel-number). Acceptable cost values range from 1 to 200000000. The default value is derived from the media speed of the interface.

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