SMC Networks TigerStack II SMC8848M

C ONFIGURING I NTERFACE S ETTINGS FOR MSTP
10-27
• Admin MST Path Cost – This parameter is used by the MSTP to
determine the best path between devices. Therefore, lower values should
be assigned to ports attached to faster media, and higher values assigned
to ports with slower media. (Path cost takes precedence over port
priority.) Note that when the Path Cost Method is set to short (page
3-63), the maximum path cost is 65,535.
By default, the system automatically detects the speed and duplex mode
used on each port, and configures the path cost according to the values
shown below. Path cost “0” is used to indicate auto-configuration mode.
Table 10-3 Recommended STA Path Cost Range
Port Type
IEEE 802.1D-1998
*
* Use the spanning-tree pathcost method command on page 29-9 to set the path cost
method.
IEEE 802.1w-2001
*
Gigabit Ethernet 3-10 2,000-200,000
10G Ethernet 1-5 200-20,000
Table 10-4 Default STA Path Costs
Port Type Link Type
IEEE 802.1D-1998
*
* Use the spanning-tree pathcost method command on page 29-9 to set the path cost
method.
IEEE 802.1w-2001
*
Gigabit Ethernet Full Duplex
Trunk
4
4
10,000
5,000
10G Ethernet Full Duplex
Trunk
2
2
1000
500