Operation Manual - STP
Quidway S3500 Series Ethernet Switches Chapter 1 MSTP Region-configuration
Huawei Technologies Proprietary
1-20
1.2.10 Configure the Path Cost of a Port
Path Cost is related to the speed of the link connected to the port. On the MSTP switch,
a port can be configured with different path costs for different STIs. Thus the traffic from
different VLANs can run over different physical links, thereby implementing the
VLAN-based load-balancing.
You can configure the path cost of a port in the following ways.
I. Configure in system view
Perform the following configuration in system view.
Table 1-14 Configure the Path Cost of a port
Operation Command
Configure the Path Cost of a
port.
stp interface interface-list [ instance instance-id ]
cost cost
Restore the default path cost
of a port.
undo stp interface interface-list [ instance
instance-id ] cost
II. Configure in Ethernet port view
Perform the following configuration in Ethernet port view.
Table 1-15 Configure the Path Cost of a port
Operation Command
Configure the Path Cost of a port stp [ instance instance-id ] cost cost
Restore the default path cost of a port. undo stp [ instance instance-id ] cost
You can configure the path cost of a port with either of the above-mentioned measures.
For more about the commands, refer to the Command Manual.
Upon the change of path cost of a port, MSTP will recalculate the port role and transit
the state. When instance-id takes 0, it indicates to set the path cost on the CIST.
By default, MSTP is responsible for calculating the port path cost.
1.2.11 Configure the Priority of a Port
For spanning tree calculation, the port priority is an importance factor to determine if a
port can be elected as the root port. With other things being equal, the port with the
highest priority will be elected as the root port. On the MSTP switch, a port can have
different priorities in different STIs and plays different roles respectively. Thus the traffic
from different VLANs can run over different physical links, thereby implementing the
VLAN-based load-balancing.
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