H3C S3610-28P Operation Manual page 242

Operation Manual – MSTP
H3C S3610&S5510 Series Ethernet Switches
Link speed
10 Gbps
Note:
In the calculation of the path cost value of an aggregated link, 802.1D-1998 does not
take into account the number of ports in the aggregated link. Whereas, 802.1T takes
the number of ports in the aggregated link into account. The calculation formula is: Path
Cost = 200,000,000/link speed (in 100 kbps), where link speed is the sum of the link
speed values of the non-blocked ports in the aggregated link.
II. Configuring Path Costs of Ports
Follow these steps to configure the path cost of ports:
Enter system view
Enter
Ethernet
interface
view or port
group view
Configure the path cost of
the port(s)
Duplex state
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
To do...
system-view
Enter
Ethernet interface interface-type
interface interface-number
view
port-group { manual
Enter port
port-group-name |
group view
aggregation agg-id }
stp [ instance instance-id ]
cost cost
802.1D-1998
2
2
2
2
Use the command...
1-36
Chapter 1 MSTP Configuration
Private
802.1t
standard
2,000 2
1,000 1
666 1
500 1
Remarks
—
Required
Use either command.
Configurations made in
Ethernet interface view
will take effect on the
current port only;
configurations made in
port group view will take
effect on all ports in the
port group.
Required
By default, MSTP
automatically calculates
the path cost of each
port.