H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 187)

20-29
Configuring Path Costs of Ports
Path cost is a parameter related to the rate of port-connected links. On an MSTP-compliant device,
ports can have different priorities in different MST instances. Setting an appropriate path cost allows
VLAN traffic flows to be forwarded along different physical links, thus to enable per-VLAN 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 cost of
the link connected with the device
stp pathcost-standard { dot1d-1998 |
dot1t | legacy }
Optional
legacy by default
Table 20-7 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
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated 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
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports 19
19
19
19 200,000
100,000
66,666
50,000 200
180
160
140
1000 Mbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports 4
4
4
4 20,000
10,000
6,666
5,000 20
18
16
14
10 Gbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports 2
2
2
2 2,000
1,000
666
500 2
1
1
1