Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-12Note:z You can configure a switch as the root bridge of multiple MSTIs. But you cannotconfigure two or more root bridges for one MSTI. So, do not configure root bridge forthe same MSTI on two or more switches using the stp root primary command.z You can configure multiple secondary root bridges for one MSTI. That is, you canconfigure secondary root bridges for the same MSTI on two or more switches usingthe stp root secondary command.z You can also configure the current switch as the root bridge by setting the priority ofthe switch to 0. Note that once a switch is configured as the root bridge or asecondary root bridge, its priority cannot be modified.III. Configuration example# Configure the current switch as the root bridge of MSTI 1 and a secondary root bridgeof MSTI 2. system-view[H3C] stp instance 1 root primary[H3C] stp instance 2 root secondary1.2.4 Bridge Priority ConfigurationRoot bridges are selected by the bridge priorities of switches. You can make a specificswitch be selected as a root bridge by setting a higher bridge priority for the switch(Note that a smaller bridge priority value indicates a higher bridge priority.) AnMSTP-enabled switch can have different bridge priorities in different MSTIs.I. Configuration procedureFollow these steps to assign a bridge priority to a switch:To do ... Use the command ... RemarksEnter system view system-view —Set a bridge priorityfor the currentswitchstp [ instance instance-id ]priority priorityRequiredThe default bridge priority of aswitch is 32,768.
