Fefd State Changes - Dell Z9500 Configuration Manual

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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.

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

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 again.

Table 43. State Change When Configuring FEFD

Link Failure

Link Failure

Important Points to Remember

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 interface.

FEFD is not supported on Fibre Channel and copper Ethernet ports.

Remote State Local Admin

Err-disabled

Bi-directional

Err-disabled

Admin Status