Configuring Interface Settings for MSTP
11-21
11
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. When the short path cost
method is selected and the default path cost recommended by the IEEE 8021w
standard exceeds 65,535, the default is set to 65,535.
The recommended range is listed in Table 11-1 on page 11-14.
The recommended path cost islisted in Table 11-2 on page 11-14.
The default path costs are listed in Table 11-3 on page 11-14.
Web – Click Spanning Tree, MSTP, Port Configuration or Trunk Configuration. Enter
the priority and path cost for an interface, and click Apply.
Figure 11-7 MSTP Port Configuration
CLI – This example sets the MSTP attributes for port 4.
Console(config)#interface ethernet 1/4 24-1
Console(config-if)#spanning-tree mst port-priority 0 29-17
Console(config-if)#spanning-tree mst cost 50 29-16
Console(config-if)
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