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To do... Use the command... Remarks
Enter Ethernet port view
interface interface-type
interface-number
—
Configure port priority for the
port
stp [ instance instance-id ]
port priority 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 switch 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.
Configuration example
# Configure the port priority of Ethernet 1/0/1 in MSTI 1 to be 16.
1) Perform this configuration in system view
<Sysname> system-view
[Sysname] stp interface Ethernet 1/0/1 instance 1 port priority 16
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp instance 1 port priority 16
Setting the Link Type of a Port to P2P
Refer to Setting the Link Type of a Port to P2P.
Enabling MSTP
Refer to Enabling MSTP.
Performing mCheck Operation
Ports on an MSTP-enabled switch can operate in three modes: STP-compatible, RSTP-compatible,
and MSTP.
If a port on a device running MSTP (or RSTP) connects to a device running STP, this port will
automatically migrate to the STP-compatible mode. However, it will not be able to migrate automatically
back to the MSTP (or RSTP) mode, but will remain working in the STP-compatible mode under the
following circumstances:
z The device running STP is shut down or removed.
z The device running STP migrates to the MSTP (or RSTP) mode.
By then, you can perform an mCheck operation to force the port to migrate to the MSTP (or RSTP)
mode.
Configuration Prerequisites
MSTP runs normally on the switch.
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