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Far-End Failure Detection
Far-end failure detection (FEFD) is a protocol that senses remote data link errors in a network. FEFD responds
by sending a unidirectional report that triggers an echoed response after a specified time interval.
You can enable FEFD globally or locally on an interface basis. Disabling the global FEFD configuration does
not disable the interface configuration.
Figure 72. Configuring Far-End Failure Detection
The report consists of several packets in SNAP format that are sent to the nearest known MAC address.
In the event of a far-end failure, the device stops receiving frames and, after the specified time interval,
assumes that the far-end is not available. The connecting line protocol is brought down so that upper layer
protocols can detect the neighbor unavailability faster.
Layer 2
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Troubleshooting
