Reference Guide

Figure 120. 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)