Fefd State Changes - Dell C9000 Series Networking Configuration Manual

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FEFD State Changes

FEFD has two operational modes: Normal and Aggressive.

When a far-end failure is detected on an FEFD-enabled interface:

If the interface is in normal FEFD mode, no user intervention is required to reset the interface; it

automatically resets to an FEFD operational state.

If the interface is in aggressive FEFD mode, manual intervention is required to reset the interface.

FEFD-enabled systems consist of one or more interfaces, which automatically switch between four 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, the state changes to unknown. You can set each interval from 3 to 255

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 45. State Change When Configuring FEFD

Local Event Mode

Link Failure

Err-disabled Up