Table 10-9 Recommended Sta Path Cost Range; Table 10-10 Default Sta Path Costs; Figure 10-11 Mstp Port Configuration - SMC Networks TigerStack II SMC8926EM Management Manual

Protocol is detecting network loops. Where more than one port is assigned the
highest priority, the port with lowest numeric identifier will be enabled.
• Default: 128
• Range: 0-240, in steps of 16
• 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 10-9 Recommended STA Path Cost Range

Port Type
Gigabit Ethernet
10G Ethernet
* Use the STA Configuration screen (page 10-6) to set the path cost method.
Port Type
Gigabit Ethernet
10G Ethernet
* Use the STA Configuration screen (page 10-6) to set the path cost method.
Web – Click Spanning Tree, MSTP, Port Configuration or Trunk Configuration. Enter
the priority and path cost for an interface, and click Apply.
Configuring Interface Settings for MSTP
*
Short Path Cost
(IEEE 802.1D-1998)
2,000-65,535
200-20,000

Table 10-10 Default STA Path Costs

*
Short Path Cost
(IEEE 802.1D-1998)
10,000
1,000

Figure 10-11 MSTP Port Configuration

*
Long Path Cost
(802.1D-2004)
2,000-200,000
200-20,000
*
Long Path Cost
(802.1D-2004)
10,000
1,000
10
10-21