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3com S7906E Manuel De Montage

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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 
Aggregate Link 2 Ports 
Aggregate Link 3 Ports 
Aggregate 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 
100 Mbps 
Single Port 
Aggregate Link 2 Ports 
Aggregate Link 3 Ports 
Aggregate Link 4 Ports 
19 
19 
19 
19 
200,000 
100,000 
66,666 
50,000 
200 
180 
160 
140 
1000 Mbps 
Single Port 
Aggregate Link 2 Ports 
Aggregate Link 3 Ports 
Aggregate Link 4 Ports 
4 
4 
4 
4 
20,000 
10,000 
6,666 
5,000 
20 
18 
16 
14 
10 Gbps 
Single Port 
Aggregate Link 2 Ports 
Aggregate Link 3 Ports 
Aggregate Link 4 Ports 
2 
2 
2 
2 
2,000 
1,000 
666 
500 
2 
1 
1 
1 
 
 
When calculating path cost for an aggregate interface, 802.1d-1998 does not take into account the 
number of member ports in its aggregation group as 802.1t does. The calculation formula of 802.1t 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 aggregation group. 
 
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, or Layer 2 
aggregate interface 
view 
interface interface-type 
interface-number 
Enter 
interface view 
or port group 
view 
Enter port group view 
port-group manual 
port-group-name 
Required 
Use either command. 
Configure the path cost of the ports 
stp 
[ instance 
instance-id 
] cost cost 
Required 
By default, MSTP 
automatically calculates 
the path cost of each port.