Configuring Port Priority - 3Com 4500 PWR 26-Port Configuration Manual

1) Perform this configuration in system view
<Sysname> system-view
[Sysname] stp interface Ethernet 1/0/1 instance 1 cost 2000
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp instance 1 cost 2000
Configuration example (B)
# Configure the path cost of Ethernet 1/0/1 in MSTI 1 to be calculated by the MSTP-enabled switch
according to the IEEE 802.1D-1998 standard.
1) Perform this configuration in system view
<Sysname> system-view
[Sysname] undo stp interface Ethernet 1/0/1 instance 1 cost
[Sysname] stp pathcost-standard dot1d-1998
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] undo stp instance 1 cost
[Sysname-Ethernet1/0/1] quit
[Sysname] stp pathcost-standard dot1d-1998

Configuring Port Priority

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 switch can have different port priorities and play different roles in different
MSTIs. 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.
Configure port priority in system view
Follow these steps to configure port priority in system view:
To do...
Enter system view
Configure port priority for
specified ports
Configure port priority in Ethernet port view
Follow these steps to configure port priority in Ethernet port view:
To do...
Enter system view
Use the command...
system-view
stp interface interface-list
instance instance-id port
priority priority
Use the command...
system-view
20-32
Remarks
—
Required
The default port priority is 128.
Remarks
—