Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-13Caution:z Once you specify a switch as the root bridge or a secondary root bridge by using thestp root primary or stp root secondary command, the bridge priority of the switchis not configurable.z During the selection of the root bridge, if multiple switches have the same bridgepriority, the one with the least MAC address becomes the root bridge.II. Configuration example# Set the bridge priority of the current switch to 4,096 in MSTI 1. system-view[H3C] stp instance 1 priority 40961.2.5 MSTP Operation Mode ConfigurationAn MSTP-enabled switch can operate in one of the following operation modes:z STP-compatible mode: In this mode, the protocol packets sent out of the ports ofthe switch are STP packets. If the switched network contains STP-enabledswitches, you can configure the current MSTP-enabled switch to operate in thismode by using the stp mode stp command.z RSTP-compatible mode: In this mode, the protocol packets sent out of the ports ofthe switch are RSTP packets. If the switched network contains RSTP-enabledswitches, you can configure the current MSTP-enabled switch to operate in thismode by using the stp mode rstp command.z MSTP mode: In this mode, the protocol packets sent out of the ports of the switchare MSTP packets, or STP packets if the ports have STP-enabled switchesconnected. But the multiple spanning tree function is only enabled for MSTPpackets.I. Configuration procedureFollow these steps to configure MSTP operation mode:To do ... Use the command ... RemarksEnter system view system-view —Configure theMSTP operationmode for the switchstp mode { stp | rstp |mstp }RequiredAn MSTP-enabled switchoperates in the MSTP modeby default.