Operation Manual – MSTPH3C S9500 Series Routing Switches Chapter 1 MSTP Configuration1-43To do... Use the command...Enable debugging of the state machinefor port role transition debugging stp state-machine prtDisable debugging of the state machinefor port role transitionundo debugging stp state-machineprtEnable debugging of the state machinefor port state transition debugging stp state-machine pstEnable debugging of the state machinefor port state transitionundo debugging stp state-machinepstEnable debugging of the topologychange state machine debugging stp state-machine tcmDisable debugging of the topologychange state machineundo debugging stp state-machinetcmEnable debugging of the state machinefor port protocol transition debugging stp state-machine ppmDisable debugging of the state machinefor port protocol transitionundo debugging stp state-machineppmEnable debugging of the port transportstate machine debugging stp state-machine ptxDisable debugging of the port transportstate machineundo debugging stp state-machineptxEnable debugging of the state machinefor topology change protection debugging stp state-machine tcpmDisable debugging of the state machinefor topology change protectionundo debugging stp state-machinetcpm1.4 Typical MSTP Configuration Examples1.4.1 Typical MSTP Configuration ExampleI. Network requirementsMSTP provides different forwarding paths for packets of different VLANs. Theconfigurations are as follows: all the switches in the network belong to the same MSTregion, packets of VLAN 10 travels along instance 1, packets of VLAN 30 travels alonginstance 3, packets of VLAN 40 travels along instance 4, and that of VLAN 20 travelsalong instance 0.In the following network diagram, Switch A and Switch B are devices of theconvergence layer, Switch C and Switch D are devices of the access layer. VLAN 10and 30 function at the distribution and access layers, and VLAN 40 functions at the
