Configuring Interface Settings for MSTP
10-21
10
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.
Web – Click Spanning Tree, MSTP, Port Configuration or Trunk Configuration. Enter
the priority and path cost for an interface, and click Apply.
Figure 10-11 MSTP Port Configuration
Table 10-9 Recommended STA Path Cost Range
Port Type
Short Path Cost
*
(IEEE 802.1D-1998)
* Use the STA Configuration screen (page 10-6) to set the path cost method.
Long Path Cost
*
(802.1D-2004)
Gigabit Ethernet 2,000-65,535 2,000-200,000
10G Ethernet 200-20,000 200-20,000
Table 10-10 Default STA Path Costs
Port Type
Short Path Cost
*
(IEEE 802.1D-1998)
* Use the STA Configuration screen (page 10-6) to set the path cost method.
Long Path Cost
*
(802.1D-2004)
Gigabit Ethernet 10,000 10,000
10G Ethernet 1,000 1,000
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