182 CHAPTER 14: MSTP CONFIGURATIONâ– Network topology changes are detected.Configuration procedureConfiguration example# Enable a switch to send trap messages conforming to 802.1d standard to thenetwork management device when the switch becomes the root bridge ofinstance 1.<4210> system-view[4210] stp instance 1 dot1d-trap newroot enableDisplaying andMaintaining MSTPYou can verify the above configurations by executing the display commands inany view.Execute the reset command in user view to clear statistics about MSTP.MSTP ConfigurationExampleNetwork requirementsImplement MSTP in the network shown in Figure 54 to enable packets of differentVLANs to be forwarded along different spanning tree instances. The detailedconfigurations are as follows:â– All switches in the network belong to the same MST region.â– Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded alongspanning tree instance 1, instance 3, instance 4, and instance 0 respectively.In this network, Switch A and Switch B operate on the convergence layer; SwitchC and Switch D operate on the access layer. VLAN 10 and VLAN 30 are limited inthe convergence layer and VLAN 40 is limited in the access layer. Switch A andTable 139 Enable trap messages conforming to 802.1d standardOperation Command DescriptionEnter system view system-view -Enable trap messagesconforming to 802.1dstandard in an instancestp [ instance instance-id ]dot1d-trap [ newroot |topologychange ] enableRequiredTable 140 Display and maintain MSTPOperation CommandDisplay the state and statistics informationabout spanning trees of the current devicedisplay stp [ instance instance-id ] [interface interface-list | slot slot-number ] [brief ]Display region configuration display stp region-configurationDisplay information about the ports that areshut down by STP protectiondisplay stp portdownDisplay information about the ports that areblocked by STP protectiondisplay stp abnormalportDisplay information about the root port of theinstance where the switch residedisplay stp rootClear statistics about MSTP reset stp [ interface interface-list ]
