7-24
z
If you change the standard that the AP uses in calculating the default path cost, the port path cost
value set through the
stp cost
command will become invalid.
z
After 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.
Configuration example
# Specify that the AP use 802.1d-1998 when calculating the default path costs of its ports.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
# Set the path cost of Ethernet 1/3 on MSTI 2 to 200.
<Sysname> system-view
[Sysname] interface ethernet 1/3
[Sysname-Ethernet1/3] stp instance 2 cost 200
Configuring Port Priority
The priority of a port is an important factor in determining whether the port can be elected as the root
port of a bridge. If all other conditions are the same, the port with the highest priority will be elected as
the root port.
On an MSTP-enabled bridge, a port can have different priorities in different MSTIs, and the same port
can play different roles in different MSTIs, 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.
Make this configuration on the leaf nodes only.
Follow these steps to configure the priority of a port or a group of ports:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter Ethernet interface
view or WLAN Mesh
interface view
interface interface-type
interface-number
Enter interface
view or port
group view
Enter port group view
port-group manual
port-group-name
Required
Use either command.
Configure the port priority
stp
[
instance instance-id
]
port priority priority
Optional
128 for all ports by default.
