H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration
1-35
1.4.5 Configuring Ports as Edge Ports
Refer to Configuring Ports as Edge Ports in the section about root bridge configuration.
1.4.6 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.
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