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[DeviceA-GigabitEthernet1/0/3] port service-loopback group 1
# In tunnel interface view, configure the tunnel to reference service loopback group 1.
[DeviceA-GigabitEthernet1/0/3] quit
[DeviceA] interface tunnel 0
[DeviceA-Tunnel0] service-loopback-group 1
[DeviceA-Tunnel0] quit
# Enable the OSPF protocol.
[DeviceA] ospf 1
[DeviceA-ospf-1] area 0
[DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[DeviceA-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255
[DeviceA-ospf-1-area-0.0.0.0] network 50.1.1.0 0.0.0.255
[DeviceA-ospf-1-area-0.0.0.0] quit
[DeviceA-ospf-1] quit
# Create local mirroring group 1.
[DeviceA] mirroring-group 1 local
# Configure GigabitEthernet 1/0/1 as a mirroring port and Tunnel 0 as the monitor port of local
mirroring group 1.
[DeviceA] mirroring-group 1 mirroring-port gigabitethernet 1/0/1 both
[DeviceA] mirroring-group 1 monitor-port tunnel 0
3. Configure Device B (the intermediate device)
# Enable the OSPF protocol
<DeviceB> system-view
[DeviceB] ospf 1
[DeviceB-ospf-1] area 0
[DeviceB-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255
[DeviceB-ospf-1-area-0.0.0.0] network 30.1.1.0 0.0.0.255
[DeviceB-ospf-1-area-0.0.0.0] quit
[DeviceB-ospf-1] quit
4. Configure Device C (the destination device)
# Create tunnel interface Tunnel 0, and configure an IP address and subnet mask for it.
<DeviceC> system-view
[DeviceC] interface tunnel 0
[DeviceC-Tunnel0] ip address 50.1.1.2 24
# Configure Tunnel 0 to operate in GRE mode, and configure source and destination IP addresses for it.
[DeviceC-Tunnel0] tunnel-protocol gre
[DeviceC-Tunnel0] source 30.1.1.2
[DeviceC-Tunnel0] destination 20.1.1.1
[DeviceC-Tunnel0] quit
# Create and configure service loopback group 1 and specify its service type as tunnel.
[DeviceC] service-loopback group 1 type tunnel
# Assign a port (GigabitEthernet 1/0/3 for example) of the device to service loopback group 1.
[DeviceC] interface GigabitEthernet 1/0/3
[DeviceC-GigabitEthernet1/0/3] undo stp enable
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