H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration
1-36
Link speed Duplex state 802.1d-1998 802.1t
Private
standard
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
10 Gbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
2
2
2
2
2,000
1,000
666
500
2
1
1
1
 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:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter
Ethernet
interface
view
interface
interface-type
interface-number
Enter
Ethernet
interface
view or port
group view
Enter port
group view
port-group { manual
port-group-name |
aggregation agg-id }
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.
Configure the path cost
of the port(s)
stp [ instance
instance-id ] cost cost
Required
By default, MSTP
automatically calculates the
path cost of each port.