1-38To do... Use the command... RemarksEnter portgroup viewport-group manualport-group-nameEnable BPDU dropping for theport(s) bpdu-drop any RequiredDisabled by defaultDisplaying and Maintaining MSTPTo do... Use the command... RemarksView information about abnormallyblocked ports display stp abnormal-port Available in any viewView information about ports blockedby STP protection functions display stp down-port Available in any viewView the historical information of portrole calculation for the specified MSTIor all MSTIsdisplay stp [ instanceinstance-id ] history [ slotslot-number ]Available in any viewView the statistics of TC/TCN BPDUssent and received by all ports in thespecified MSTI or all MSTIsdisplay stp [ instanceinstance-id ] tc [ slot slot-number ] Available in any viewView the status information andstatistics information of MSTPdisplay stp [ instanceinstance-id ] [ interfaceinterface-list | slot slot-number ][ brief ]Available in any viewView the MST region configurationinformation that has taken effect display stp region-configuration Available in any viewView the root bridge information of allMSTIs display stp root Available in any viewClear the statistics information ofMSTP reset stp [ interface interface-list ] Available in user viewMSTP Configuration ExampleNetwork requirementsz All devices on the network are in the same MST region. Device A and Device B work on thedistribution layer, while Device C and Device D work on the access layer.z Configure MSTP so that packets of different VLANs are forwarded along different spanning trees:Packets of VLAN 10 are forwarded along MSTI 1, those of VLAN 30 are forwarded along MSTI 3,those of VLAN 40 are forwarded along MSTI 4, and those of VLAN 20 are forwarded along MSTI 0.z VLAN 10 and VLAN 30 are terminated on the distribution layer devices, and VLAN 40 is terminatedon the access layer devices, so the root bridges of MSTI 1 and MSTI 3 are Device A and Device Brespectively, while the root bridge of MSTI 4 is Device C.
