3com S7906E 참조 가이드

 

1-25 

Table 1-10 Link speed vs. path cost 

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 port, 802.1D-1998 does not take into account the number 

of member ports in its aggregation group as 802.1T does. 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 aggregation group. 

# Configure the device to calculate the default path cost for ports based on IEEE 802.1D-1998.  

<Sysname> system-view 

[Sysname] stp pathcost-standard dot1d-1998 

# Configure the device to calculate the default path cost for ports based on IEEE 802.1t.  

<Sysname> system-view 

[Sysname] stp pathcost-standard dot1t 

stp point-to-point { auto | force-false | force-true } 

undo stp point-to-point 

Ethernet port view, port group view, Layer-2 aggregate port view