Operation Manual – MSTPH3C S3100 Series Ethernet Switches Chapter 1 MSTP Configuration1-421.4.10 Enabling MSTPRefer to section 1.3.14 “Enabling MSTP”.1.5 Performing mCheck OperationPorts on an MSTP-enabled switch can operate in three modes: STP-compatible,RSTP-compatible, and MSTP.A port on an MSTP-enabled switch operating as an upstream switch transits to theSTP-compatible mode when it has an STP-enabled switch connected to it. When theSTP-enabled downstream switch is then replaced by an MSTP-enabled switch, theport cannot automatically transit to the MSTP mode. It remains in the STP-compatiblemode. In this case, you can force the port to transit to the MSTP mode by performingthe mCheck operation on the port.Similarly, a port on an RSTP-enabled switch operating as an upstream switch turns tothe STP-compatible mode when it has an STP-enabled switch connected to it. Whenthe STP enabled downstream switch is then replaced by an MSTP-enabled switch, theport cannot automatically transit to the RSTP mode. It remains in the STP-compatiblemode. In this case, you can force the port to transit to the RSTP mode by performingthe mCheck operation on the port.1.5.1 Configuration PrerequisitesMSTP runs normally on the switch.1.5.2 Configuration ProcedureYou can perform the mCheck operation in the following two ways.I. Perform the mCheck operation in system viewTable 1-34 Perform the mCheck operation in system viewOperation Command DescriptionEnter system view system-view —Perform the mCheckoperationstp [ interface interface-list ]mcheck RequiredII. Perform the mCheck operation in Ethernet port viewTable 1-35 Perform the mCheck operation in Ethernet port viewOperation Command DescriptionEnter system view system-view —
