Configuring Port Priority - H3C S7500E Series Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches
Caution:
If you change the standard that the device uses in calculating the default path cost,
the port path cost value set through the stp cost command will be out of effect.
When the path cost of a port is changed, MSTP will re-calculate the role of the port
and initiate a state transition. If you use 0 as instance-id, you are setting the path
cost of the CIST.

1.4.7 Configuring Port Priority

The priority of a port is an import basis that determines whether the port can be elected
as the root port of device. If all other conditions are the same, the port with the highest
priority will be elected as the root port.
On an MSTP-compliant device, a port can have different priorities in different MST
instances, and the same port can play different roles in different MST instances, so that
data of different VLANs can be propagated along different physical paths, thus
implementing per-VLAN load balancing. You can set port priority values based on the
actual networking requirements.
I. Configuration procedure
Follow these steps to configure the priority of a port or a group of ports:
Enter system view
Enter
Ethernet
interface
view or port
group view
Configure the port priority
To do...
system-view
Enter
Ethernet interface interface-type
interface interface-number
view
port-group { manual
Enter port
port-group-name |
group view
aggregation agg-id }
stp [ instance
instance-id ] port priority
priority
Use the command...
1-37
Chapter 1 MSTP Configuration
Remarks
—
Required
Use either command.
Configurations made in
Ethernet interface view
will take effect on the
current port only;
configurations made in
port group view will take
effect on all ports in the
port group.
Optional
128 for all Ethernet ports
by default.