# Create VLANs 1 through 30.
<DeviceA> system-view
[DeviceA] vlan 1 to 30
# Configure GigabitEthernet 1/0/1 as a trunk port.
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] port link-type trunk
# Assign the interface to VLANs 1 through 30.
[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 1 to 30
# Enable flush message receiving on the interface.
[DeviceA-GigabitEthernet1/0/1] smart-link flush enable
[DeviceA-GigabitEthernet1/0/1] quit
# Configure GigabitEthernet 1/0/2 in the same way GigabitEthernet 1/0/1 is configured.
[DeviceA] interface gigabitethernet 1/0/2
[DeviceA-GigabitEthernet1/0/2] port link-type trunk
[DeviceA-GigabitEthernet1/0/2] port trunk permit vlan 1 to 30
[DeviceA-GigabitEthernet1/0/2] smart-link flush enable
[DeviceA-GigabitEthernet1/0/2] quit
3.
Configure Device B:
# Create VLANs 1 through 30.
<DeviceB> system-view
[DeviceB] vlan 1 to 30
# Configure GigabitEthernet 1/0/1 as a trunk port.
[DeviceB] interface gigabitethernet 1/0/1
[DeviceB-GigabitEthernet1/0/1] port link-type trunk
# Assign the interface to VLANs 1 through 30.
[DeviceB-GigabitEthernet1/0/1] port trunk permit vlan 1 to 30
# Enable flush message receiving on the interface.
[DeviceB-GigabitEthernet1/0/1] smart-link flush enable
[DeviceB-GigabitEthernet1/0/1] quit
# Disable the spanning tree feature on GigabitEthernet 1/0/2.
[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] undo stp enable
# Configure the interface as a trunk port.
[DeviceB-GigabitEthernet1/0/2] port link-type trunk
# Assign the interface to VLANs 1 through 30.
[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan 1 to 30
# Enable flush message receiving on the interface.
[DeviceB-GigabitEthernet1/0/2] smart-link flush enable
[DeviceB-GigabitEthernet1/0/2] quit
# Create monitor link group 1.
[DeviceB] monitor-link group 1
# Configure GigabitEthernet 1/0/1 as an uplink interface for monitor link group 1.
[DeviceB-mtlk-group1] port gigabitethernet 1/0/1 uplink
# Configure GigabitEthernet 1/0/2 as a downlink interface for monitor link group 1.
[DeviceB-mtlk-group1] port gigabitethernet 1/0/2 downlink
[DeviceB-mtlk-group1] quit
4.
Configure Device D:
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