How Uplink Failure Detection Works - Dell S4048–ON Configuration Manual

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Figure 131. 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.

Uplink Failure Detection (UFD)