Dell S4820T - How Uplink Failure Detection Works

Figure 126. Uplink Failure Detection
How Uplink Failure Detection Works
UFD creates an association between upstream and downstream interfaces. The association of uplink and
downlink interfaces is called an uplink-state group.
An interface in an uplink-state group can be a physical interface or a port-channel (LAG) aggregation of
physical interfaces.
An enabled uplink-state group tracks the state of all assigned upstream interfaces. Failure on an upstream
interface results in the automatic disabling of downstream interfaces in the uplink-state group. As a
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Uplink Failure Detection (UFD)