20-33To do... Use the command... RemarksEnter Ethernet port view interface interface-typeinterface-number —Configure port priority for theportstp [ instance instance-id ]port priority priorityRequired.The default port priority is 128.Changing port priority of a port may change the role of the port and put the port into state transition.A smaller port priority value indicates a higher possibility for the port to become the root port. If all theports of a switch have the same port priority value, the port priorities are determined by the port indexes.Changing the priority of a port will cause spanning tree recalculation.You can configure port priorities according to actual networking requirements.Configuration example# Configure the port priority of Ethernet 1/0/1 in MSTI 1 to be 16.1) Perform this configuration in system view system-view[Sysname] stp interface Ethernet 1/0/1 instance 1 port priority 162) Perform this configuration in Ethernet port view system-view[Sysname] interface Ethernet 1/0/1[Sysname-Ethernet1/0/1] stp instance 1 port priority 16Setting the Link Type of a Port to P2PRefer to Setting the Link Type of a Port to P2P.Enabling MSTPRefer to Enabling MSTP.Performing mCheck OperationPorts on an MSTP-enabled switch can operate in three modes: STP-compatible, RSTP-compatible,and MSTP.If a port on a device running MSTP (or RSTP) connects to a device running STP, this port willautomatically migrate to the STP-compatible mode. However, it will not be able to migrate automaticallyback to the MSTP (or RSTP) mode, but will remain working in the STP-compatible mode under thefollowing circumstances:z The device running STP is shut down or removed.z The device running STP migrates to the MSTP (or RSTP) mode.By then, you can perform an mCheck operation to force the port to migrate to the MSTP (or RSTP)mode.Configuration PrerequisitesMSTP runs normally on the switch.
