Dell S4820T Configuration Manual page 586

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FEFD enabled systems (comprised of one or more interfaces) automatically switchs between four

different states: Idle, Unknown, Bi-directional, and Err-disabled.

An interface on which FEFD is not configured is in Normal mode by default.

After you enable FEFD on an interface, it transitions to the Unknown state and sends an FEFD packet

to the remote end of the link.

When the local interface receives the echoed packet from the remote end, the local interface

transitions to the Bi-directional state.

If the FEFD enabled system is configured to use FEFD in Normal mode and neighboring echoes are

not received after three intervals, (you can set each interval can be set between 3 and 300 seconds)

the state changes to unknown.

If the FEFD system has been set to Aggressive mode and neighboring echoes are not received after

three intervals, the state changes to Err-disabled. You must manually reset all interfaces in the Err-

disabled state using the fefd reset [interface] command in EXEC privilege mode (it can be

done globally or one interface at a time) before the FEFD enabled system can become operational

Table 41. State Change When Configuring FEFD

Link Failure Normal

Link Failure Aggressive

Important Points to Remember

FEFD enabled ports are subject to an 8 to 10 second delay during an RPM failover before becoming

operational.

You can enable FEFD globally or on a per-interface basis. Interface FEFD configurations override

global FEFD configurations.

Dell Networking OS supports FEFD on physical Ethernet interfaces only, excluding the management

Local State Remote

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