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• 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 3-161), 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.
•Range –
- Ethernet: 200,000-20,000,000
- Fast Ethernet: 20,000-2,000,000
- Gigabit Ethernet: 2,000-200,000
- 10 Gigabit Ethernet: 200-20,000
•Default –
- Ethernet – Half duplex: 2,000,000; full duplex: 1,000,000;
trunk: 500,000
- Fast Ethernet – Half duplex: 200,000; full duplex: 100,000;
trunk: 50,000
- Gigabit Ethernet – Full duplex: 10,000; trunk: 5,000
- 10 Gigabit Ethernet – Full duplex: 1000; trunk: 500
Web – Click Spanning Tree, MSTP, Port or Trunk Configuration. Enter
the priority and path cost for an interface, and click Apply.
Figure 3-74 MSTP Port Configuration