# Modify TrCRF Spanning-Tree Protocol Configuration

You can change the path cost and priority of a TrCRF.

This dialog box displays the following information:

STP State (dot1dStpPortState)

Current status of this TrCRF within the spanning tree. Possible values are disabled, blocked, listening, learning, and forwarding.

Cost (dot1dStpPortPathCost)

Cost associated with the TrCRF. The Spanning-Tree Protocol uses path costs to determine which VLAN to select as a forwarding VLAN. Therefore, lower numbers should be assigned to VLANs that use faster media (such as full-duplex), and higher numbers should be assigned to VLANs that use slower media. The possible range is 1 to 65535. The default is 62. A rule of thumb for the path cost is 1000 / LAN speed, in megabits per second.

Priority (dot1dStpPortPriority)

Priority associated with the TrCRF. The VLAN with the lowest priority value has the highest priority and will forward the spanning-tree frames. The possible range is 0 through 255 (decimal). The default is 128. If all VLANs have the same priority value, the lowest VLAN ID forwards the spanning-tree frames.

Click Apply to make you changes take affect or Cancel to close the dialog box without making any changes.