Operation Manual – MSTPH3C S5500-EI Series Ethernet Switches Chapter 1 MSTP Configuration1-401.5 Performing mCheckPorts 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 adevice 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 migrateautomatically to the MSTP (or RSTP) mode, but will remain working in theSTP-compatible mode. In this case, you can perform an mCheck operation to force theport to migrate to the MSTP (or RSTP) mode.You can perform mCheck on a port through two approaches, which lead to the sameresult.1.5.1 Configuration PrerequisitesMSTP has been correctly configured on the device.1.5.2 Configuration ProcedureI. Performing mCheckgloballyFollow these steps to perform global mCheck:To do... Use the command... RemarksEnter system view system-view —Perform mCheck stp mcheck RequiredII. Performing mCheck in Ethernet interface viewFollow these steps to perform mCheck in Ethernet interface view:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet interfaceviewinterface interface-typeinterface-number —Perform mCheck stp mcheck Required
