How Uplink Failure Detection Works - Dell S4820T Configuration Manual

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Figure 127. 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)