228 CHAPTER 23: MSTP CONFIGURATION
Enabling the MSTP
Feature
Refer to “Enabling the MSTP Feature” on page 224 in the section about root
bridge configuration.
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:
Performing mCheck in Ethernet interface view
Follow these steps to perform mCheck in Ethernet interface view:
c
CAUTION: 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 1/0/1.
1 Method 1: Perform mCheck globally.
<Sysname> system-view
[Sysname] stp mcheck
2 Method 2: Perform mCheck in Ethernet interface view.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp mcheck
To do… Use the command… Remarks
Enter system view system-view -
Perform mCheck stp mcheck Required
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
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