Device-level packet loss measurement includes the following scenarios:
In Figure 1, the link between directly connected devices conforms to the packet conservation rule. For example, after packet loss measurement is enabled for the direct link between Switch_1 and Switch_2, you can obtain the loss ratio of packets sent from Switch_1 to Switch_2, or from Switch_2 to Switch_1.
In Figure 2, the device conforms to the packet conservation rule. For example, after the packet loss measurement is enabled for Switch, you can obtain the loss ratio of packets sent and received by Switch.