[DeviceA-Ethernet1/0/3] undo ndp enable
[DeviceA-Ethernet1/0/3] port service-loopback group 1
[DeviceA-Ethernet1/0/3] quit
# Create logical interface Tunnel 1 and reference service loopback group 1 on Tunnel 1.
[DeviceA] interface tunnel 1
[DeviceA-Tunnel1] service-loopback-group 1
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