264 CHAPTER 30: MSTP C ONFIGURATIONMSTP-enabled switch, the port cannot automatically transit to the MSTP operationmode. It remains in the STP-compatible mode. In this case, you can force the portto transit to the MSTP mode by performing the mCheck operation on the port.Prerequisites MSTP runs normally on the switch.Configuration Procedure You can perform the mCheck operation in the following two ways.Performing the mCheck operation in system viewPerforming the mCheck operation in Ethernet port viewConfiguration Example # Perform the mCheck operation on Ethernet1/0/1 port■ Configure in system view. system-view[SW7750] stp interface ethernet1/0/1 mcheck■ Configure in Ethernet port view. system-view[SW7750] interface ethernet1/0/1[SW7750-Ethernet1/0/1] stp mcheckProtection FunctionConfigurationIntroduction The following protection functions are available on an MSTP-enabled switch:BPDU protection, root protection, loop guard, and topology change BPDU(TC-BPDU) attack guard.BPDU protectionNormally, the access ports of the devices operating on the access layer directlyconnect to terminals (such as PCs) or file servers. These ports are usuallyconfigured as edge ports to achieve rapid transition. But they resume non-edgeports automatically upon receiving configuration BPDUs, which causes spanningtree regeneration and network topology jitter.Table 196 Perform the mCheck operation in system viewOperation Command DescriptionEnter system view System-view -Perform the mCheckoperationstp [ interface interface-list ] mcheck RequiredTable 197 Perform the mCheck operation in Ethernet port viewOperation Command DescriptionEnter system view system-view -Enter Ethernet port view interface interface-typeinterface-number-Perform the mCheck operation stp mcheck Required
