3Com 3C13636 Configuration Manual page 366

3Com Router 3000 Ethernet Family
Configuration Guide
Table 3-17 Assign a priority to the bridge
Assign a priority to the bridge
Restore the default priority of the bridge
The default priority of the bridge is 32,768.
IV. Assigning a path cost to a bridge port (Optional)
Assign a path cost to a bridge port depending on its link speed. The higher the link
speed is, the lower the path cost should be configured.
When a bridge port uses the default path cost, STP can automatically identify the type
of the port and get the corresponding default path cost value.
Perform the following configuration in interface view.
Table 3-18 Assign a path cost to a bridge port
Assign a path cost to a bridge port
Restore the default path cost of the
bridge port
For an Ethernet port, the default path cost is 19; for a serial port, the default path cost
is 1000.
V. Assigning a priority to a bridge port (optional)
The ID of a bridge port comprises port priority and port number.
When the path costs of all ports on a bridge are the same, the one with the lowest port
ID is more likely to be elected as the designated port. The process is as follows:
Compare the priorities of the ports on the bridge. The one with the lowest port
priority is elected as the designated port.
In case multiple ports on the bridge have the same priority, compare their port
numbers and elect the port with the lowest number as the designated port.
Perform the following configuration in interface view.
Table 3-19 Assign a priority to the bridge port
Assign a priority to the bridge port
Operation
Operation
Operation
3Com Corporation
3-17
Chapter 3 Bridge Configuration
Command
bridge stp priority value
undo bridge stp priority
Command
bridge-set bridge-set stp port pathcost
cost
undo bridge-set bridge-set stp port
pathcost
Command
bridge-set bridge-set stp port priority
value