H3C S5120-SI Series

1-29
Configuring Ports as Edge Ports
Refer to Configuring Ports as Edge Ports in the section about root bridge configuration.
Configuring Path Costs of Ports
Path cost is a parameter related to the rate of a port. On an MSTP-enabled device, a port can have
different path costs in different MSTIs. Setting appropriate path costs allows VLAN traffic flows to be
forwarded along different physical links, thus to achieve VLAN-based load balancing.
The device can automatically calculate the default path cost; alternatively, you can also configure the
path cost for ports.
Specifying a standard that the device uses when calculating the default path cost
You can specify a standard for the device to use in automatic calculation for the default path cost. The
device supports the following standards:
z dot1d-1998: The device calculates the default path cost for ports based on IEEE 802.1d-1998.
z dot1t: The device calculates the default path cost for ports based on IEEE 802.1t.
z legacy: The device calculates the default path cost for ports based on a private standard.
Follow these steps to specify a standard for the device to use when calculating the default path cost:
To do... Use the command... Remarks
Enter system view
system-view
—
Specify a standard for the device to
use when calculating the default path
costs for ports of the device
stp pathcost-standard
{ dot1d-1998 | dot1t | legacy }
Optional
legacy by default.
Table 1-7 Link speed vs. path cost
Link speed
Duplex state
802.1d-1998 802.1t Private standard
0 — 65535 200,000,000 200,000
10 Mbps
Single Port
Aggregate Link 2 Ports
Aggregate Link 3 Ports
Aggregate Link 4 Ports
100
100
100
100
2,000,000
1,000,000
666,666
500,000
2,000
1,800
1,600
1,400
100 Mbps
Single Port
Aggregate Link 2 Ports
Aggregate Link 3 Ports
Aggregate Link 4 Ports
19
19
19
19
200,000
100,000
66,666
50,000
200
180
160
140
1000 Mbps
Single Port
Aggregate Link 2 Ports
Aggregate Link 3 Ports
Aggregate Link 4 Ports
4
4
4
4
20,000
10,000
6,666
5,000
20
18
16
14
10 Gbps
Single Port
Aggregate Link 2 Ports
Aggregate Link 3 Ports
Aggregate Link 4 Ports
2
2
2
2
2,000
1,000
666
500
2
1
1
1