3Com MSR 50 Series Configuration Manual page 471

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:
dot1d-1998: The device calculates the default path cost for ports based on
■
IEEE 802.1D-1998.
dot1t: The device calculates the default path cost for ports based on IEEE
■
802.1t.
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...
Enter system view
Specify a standard for the device
to use when calculating the
default path cost of the link
connected with the device
Table 16 Link speed vs. path cost
Link speed Duplex state
0 -
10 Mbps Single Port
Aggregated
Link 2 Ports
Aggregated
Link 3 Ports
Aggregated
Link 4 Ports
100 Mbps Single Port
Aggregated
Link 2 Ports
Aggregated
Link 3 Ports
Aggregated
Link 4 Ports
Use the command...
system-view
stp pathcost-standard
{ dot1d-1998 | dot1t | legacy }
802.1D-1998 802.1t
65535 200,000,000
100 2,000,000
100 1,000,000
100 666,666
100 500,000
19 200,000
19 100,000
19 66,666
19 50,000
Configuring Leaf Nodes
Remarks
-
Optional
legacy by default
Private standard
200,000
2,000
1,800
1,600
1,400
200
180
160
140
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