Users Guide

enable FEFD globally or locally on an interface basis. Disabling the global FEFD configuration does not disable
the interface configuration.
Figure 66. 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.
FEFD State Changes
FEFD has two operational modes, Normal and Aggressive.
When you enable Normal mode on an interface and a far-end failure is detected, no intervention is required
to reset the interface to bring it back to an FEFD operational state. When you enable Aggressive mode on an
interface in the same state, manual intervention is required to reset the interface.
FEFD enabled systems (comprised of one or more interfaces) automatically switches between four different
states: Idle, Unknown, Bi-directional, and Err-disabled.
1 An interface on which FEFD is not configured is in Normal mode by default.
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