3com WX1200 3CRWX120695A Manuel D’Utilisation

Port cost is a numeric value that STP adds to the total cost of a path to 
the root bridge. When a designated bridge has multiple equal-cost paths 
to the root bridge, the designated bridge uses the path with the lowest 
total cost. You can set this parameter on an individual port basis, for all 
VLANs the port is in, or for specific VLANs.

You can specify a value from 1 through 65,535 for the port cost. The 
default depends on the port speed and link type. Table 29 lists the 
defaults for STP port path cost.

Port priority is the eligibility of the port to be the designated port to the 
root bridge, and thus part of the path to the root bridge. When the WX 
switch has more than one link to the root bridge, STP uses the link with 
the lowest priority value. You can set this parameter on an individual port 
basis, for all VLANs the port is in, or for specific VLANs.

Specify a priority from 0 (highest priority) through 255 (lowest priority). 
The default is 128.

To change the bridge priority, use the following command:

set spantree priority value {all | vlan vlan-id}

Specify a bridge priority from 0 through 65,535. The default is 32,768. 
The all option applies the change globally to all VLANs. Alternatively, 
specify an individual VLAN.

Table 29   SNMP Port Path Cost Defaults

1000 Mbps

Full Duplex Aggregate 
Link (Port Group)

19

1000 Mbps

Full Duplex

4

100 Mbps

Full Duplex Aggregate 
Link (Port Group)

19

100 Mbps

Full Duplex

18

100 Mbps

Half Duplex

19

10 Mbps

Full Duplex Aggregate 
Link (Port Group)

19

10 Mbps

Full Duplex

95

10 Mbps

Half Duplex

100