107Configuration procedure1. Configure VLANs and VLAN member ports (details not shown):{ Create VLAN 10, VLAN 20, and VLAN 30 on Device A and Device B.{ Create VLAN 10, VLAN 20, and VLAN 40 on Device C.{ Create VLAN 20, VLAN 30, and VLAN 40 on Device D.{ Configure the ports on these devices as trunk ports and assign them to related VLANs.2. Configure Device A:# Set the spanning tree mode to PVST. system-view[DeviceA] stp mode pvst# Specify the device as the root bridge of VLAN 10 and VLAN 20.[DeviceA] stp vlan 10 20 root primary# Enable the spanning tree feature globally and for VLANs 10, 20, and 30.[DeviceA] stp enable[DeviceA] stp vlan 10 20 30 enable3. Configure Device B:# Set the spanning tree mode to PVST. system-view[DeviceB] stp mode pvst# Specify the device as the root bridge of VLAN 30.[DeviceB] stp vlan 30 root primary# Enable the spanning tree feature globally and for VLANs 10, 20, and 30.[DeviceB] stp enable[DeviceB] stp vlan 10 20 30 enable4. Configure Device C:# Set the spanning tree mode to PVST. system-view[DeviceC] stp mode pvst# Specify the current device as the root bridge of VLAN 40.[DeviceC] stp vlan 40 root primary# Enable the spanning tree feature globally and for VLANs 10, 20, and 40.[DeviceC] stp enable[DeviceC] stp vlan 10 20 40 enable5. Configure Device D:# Set the spanning tree mode to PVST. system-view[DeviceD] stp mode pvst# Enable the spanning tree feature globally and for VLANs 20, 30, and 40.[DeviceD] stp enable[DeviceD] stp vlan 20 30 40 enable6. Verify the configurations:You can use the display stp brief command to display brief spanning tree information on eachdevice after the network is stable.
