The SAP path cost is used by STP to calculate the path cost to the root bridge. The path cost in BPDUs received on the root port is incremental with the configured path cost for that SAP. When BPDUs are sent out other egress SAPs, the newly calculated root path cost is used.
STP suggests that the path cost is defined as a function of the link bandwidth. Since SAPs are controlled by complex queuing dynamics, the STP path cost is a static configuration on the 7210 SAS.
The default value for SAP path cost is 10. This parameter can be modified within a range of 1 to 65535, 1 being the lowest cost.
— config>service>vpls>sap>stp#
— path-cost sap-path-cost
Range: 1 to 200000000
Default: 10
Restore Default: no path-cost