3com WX3000 Manuel D’Utilisation

 

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[device] stp pathcost-standard dot1d-1998 

2)  Perform this configuration in Ethernet port view 

<device> system-view 

[device] interface GigabitEthernet1/0/1 

[device-GigabitEthernet1/0/1] undo stp instance 1 cost 

[device-GigabitEthernet1/0/1] quit 

[device] stp pathcost-standard dot1d-1998 

Port priority is an important criterion on determining the root port. In the same condition, the port with the 
smallest port priority value becomes the root port. 

A port on an MSTP-enabled device can have different port priorities and play different roles in different 
spanning tree instances. This enables packets of different VLANs to be forwarded along different 
physical paths, so that VLAN-based load balancing can be implemented. 

You can configure port priority in one of the following two ways. 

Follow these steps to configure port priority in system view: 

Enter system view 

— 

Configure port priority for 
specified ports 

 interface-list 

 instance-id port 

priority priority

 

Required 
The default port priority is 128. 

 

Follow these steps to configure port priority in Ethernet port view: 

Enter system view 

— 

Enter Ethernet port view 

 interface-type 

interface-number 

— 

Configure port priority for the 
port 

 [ instance instance-id ] 

 priority 

Required. 
The default port priority is 128. 

 

Changing port priority of a port may change the role of the port and put the port into state transition. 

A smaller port priority value indicates a higher possibility for the port to become the root port. If all the 
ports of a device have the same port priority value, the port priorities are determined by the port indexes. 
Changing the priority of a port will cause spanning tree recalculation. 

You can configure port priorities according to actual networking requirements. 

# Configure the port priority of GigabitEthernet 1/0/1 in spanning tree instance 1 to be 16. 

1)  Perform this configuration in system view 

<device> system-view