stp pathcost-standard
Function
The stp pathcost-standard command sets the standard used to calculate the path cost.
The undo stp pathcost-standard command restores the default standard used to calculate the path cost.
By default, the IEEE 802.1T is used to calculate the path cost.
Parameters
| Parameter | Description | Value |
|---|---|---|
| dot1d-1998 | Indicates IEEE 802.1D standard that used to calculate the path cost. | - |
| dot1t | Indicates IEEE 802.1T standard that used to calculate the path cost. | - |
| legacy | Indicates Huawei legacy standard that used to calculate the path cost. | - |
Usage Guidelines
Usage Scenario
A path cost is a port parameter, and is used by a spanning tree protocol to select a link. By calculating path costs, a spanning tree protocol selects stable links, blocks redundant paths, and trims a network into a loop-free network. The path cost range is determined by the path cost calculation standard.
Interface Rate |
Interface Mode |
Recommended STP Path Cost |
||
|---|---|---|---|---|
IEEE 802.1D-1998 Standard |
IEEE 802.1T Standard |
Huawei Legacy Standard |
||
0 |
- |
65535 |
200,000,000 |
200,000 |
10 Mbps |
Half-Duplex |
100 |
2,000,000 |
2000 |
Full-Duplex |
99 |
1,999,999 |
1999 |
|
Aggregated Link 2 Ports |
95 |
1,000,000 |
1800 |
|
Aggregated Link 3 Ports |
95 |
666,666 |
1600 |
|
Aggregated Link 4 Ports |
95 |
500,000 |
1400 |
|
100 Mbps |
Half-Duplex |
19 |
200,000 |
200 |
Full-Duplex |
18 |
199,999 |
199 |
|
Aggregated Link 2 Ports |
15 |
100,000 |
180 |
|
Aggregated Link 3 Ports |
15 |
66,666 |
160 |
|
Aggregated Link 4 Ports |
15 |
50,000 |
140 |
|
1000 Mbps |
Full-Duplex |
4 |
20,000 |
20 |
Aggregated Link 2 Ports |
3 |
10,000 |
18 |
|
Aggregated Link 3 Ports |
3 |
6666 |
16 |
|
Aggregated Link 4 Ports |
3 |
5000 |
14 |
|
10 Gbps |
Full-Duplex |
2 |
2000 |
2 |
Aggregated Link 2 Ports |
1 |
1000 |
1 |
|
Aggregated Link 3 Ports |
1 |
666 |
1 |
|
Aggregated Link 4 Ports |
1 |
500 |
1 |
|
Precautions
If the path cost calculation standard is changed on a port, the path cost of the port is restored to the default value. The stp cost command can be used to set a path cost for a port.
Usually, all switching devices on the same network use the same path cost calculation standard.
