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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.
Configuration Procedure
You can perform the mCheck operation in the following two ways.
Perform the mCheck operation in system view
Follow these steps to perform the mCheck operation in system view:
To do... Use the command... Remarks
Enter system view
system-view
—
Perform the mCheck operation
stp [ interface interface-list ]
mcheck
Required
Perform the mCheck operation in Ethernet port view
Follow these steps to perform the mCheck operation in Ethernet port view:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Perform the mCheck operation
stp mcheck
Required
Configuration Example
# Perform the mCheck operation on Ethernet 1/0/1.
1) Perform this configuration in system view
<Sysname> system-view
[Sysname] stp interface Ethernet 1/0/1 mcheck
2) Perform this configuration in Ethernet port view
<Sysname> system-view
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