H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 190)

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Performing mCheck
Ports on an MSTP-compliant device have three working modes: STP compatible mode, RSTP mode,
and MSTP mode.
In a switched network, if a port on the device running MSTP (or RSTP) connects to a device running
STP, this port will automatically migrate to the STP-compatible mode. However, if the device running
STP is removed, this will not be able to migrate automatically to the MSTP (or RSTP) mode, but will
remain working in the STP-compatible mode. In this case, you can perform an mCheck operation to
force the port to migrate to the MSTP (or RSTP) mode.
You can perform mCheck on a port through two approaches, which lead to the same result.
Configuration Prerequisites
MSTP has been correctly configured on the device.
Configuration Procedure
Performing mCheckglobally
Follow these steps to perform global mCheck:
To do... Use the command... Remarks
Enter system view system-view —
Perform mCheck stp mcheck Required
Performing mCheck in Ethernet interface view
Follow these steps to perform mCheck in Ethernet interface view:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Perform mCheck stp mcheck Required
The stp mcheck command is meaningful only when the device works in the MSTP (or RSTP) mode,
not in the STP-compatible mode.
Configuration Example
# Perform mCheck on port GigabitEthernet 0/0/1.
1) Method 1: Perform mCheck globally.
system-view
[Sysname] stp mcheck