H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 200)

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where ‘link transmission speed” is the sum of the speeds of all the unblocked ports on the aggregated
link measured in 100 Kbps.
Configure the path cost for specific ports
Follow these steps to configure the path cost for specified ports in system view:
To do… Use the command… Remarks
Enter system view System-view —
Configure the path cost for
specified ports stp interface interface-list
[ instance instance-id ] cost cost
Required
An MSTP-enabled device can
calculate path costs for all its ports
automatically.
Follow these steps to configure the path cost for a port in Ethernet port view:
To do… Use the command… Remarks
Enter system view System-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the path cost for the port
stp [ instance instance-id ] cost
cost
Required
An MSTP-enabled device can
calculate path costs for all its ports
automatically.
Changing the path cost of a port may change the role of the port and put it in state transition. Executing
the stp cost command with the instance-id argument being 0 sets the path cost on the CIST for the port.
Configuration example (A)
# Configure the path cost of GigabitEthernet 1/0/1 in spanning tree instance 1 to be 2,000.
1) Perform this configuration in system view
system-view
[device] stp interface GigabitEthernet1/0/1 instance 1 cost 2000
2) Perform this configuration in Ethernet port view
system-view
[device] interface GigabitEthernet1/0/1
[device-GigabitEthernet1/0/1] stp instance 1 cost 2000
Configuration example (B)
# Configure the path cost of GigabitEthernet 1/0/1 in spanning tree instance 1 to be calculated by the
MSTP-enabled device according to the IEEE 802.1D-1998 standard.
1) Perform this configuration in system view
system-view
[device] undo stp interface GigabitEthernet1/0/1 instance 1 cost
[device] stp pathcost-standard dot1d-1998
2) Perform this configuration in Ethernet port view
system-view
[device] interface GigabitEthernet1/0/1
[device-GigabitEthernet1/0/1] undo stp instance 1 cost
[device-GigabitEthernet1/0/1] quit
[device] stp pathcost-standard dot1d-1998