Table 98: Recommended Sta Path Cost Range; Table 99: Default Sta Path Costs; Spanning-Tree Cost - Edge-Core ECS4120-28F Reference Manual

spanning-tree cost

This command configures the spanning tree path cost for the specified interface.
Use the no form to restore the default auto-configuration mode.
Syntax
Default Setting
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.

Table 99: Default STA Path Costs

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
10G Ethernet
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆
spanning-tree cost cost
no spanning-tree cost
cost - The path cost for the port. (Range: 0 for auto-configuration, 1-65535
for short path cost method

Table 98: Recommended STA Path Cost Range

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet
10G Ethernet
Short Path Cost
(IEEE 802.1D-1998)
65,535
65,535
10,000
1,000
This command is used by the Spanning Tree Algorithm 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.
20. Use the spanning-tree pathcost method
displayed in the CLI prompt message shows the maximum value for path cost. However,
note that the switch still enforces the rules for path cost based on the specified path cost
method (long or short).
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Chapter 19
20
, 1-200,000,000 for long path cost method)
Short Path Cost
(IEEE 802.1D-1998)
50-600
10-60
3-10
1-5
Long Path Cost
(IEEE 802.1D-2004)
1,000,000
100,000
10,000
1,000
command to set the path cost method. The range
| Spanning Tree Commands
Long Path Cost
(802.1D-2004)
200,000-20,000,000
20,000-2,000,000
2,000-200,000
200-20,000