Dell S3048-ON

Figure 119. 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 result, downstream devices can execute the protection or recovery
procedures they have in place to establish alternate connectivity paths, as shown in the following illustration.
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Uplink Failure Detection (UFD)