How Uplink Failure Detection Works - Dell S3048-ON Configuration Manual

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.
862 Uplink Failure Detection (UFD)