Operation Manual – MSTP
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 MSTP Configuration
1-35
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.
I. 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 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
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
