Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 650

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. 1 An interface on which FEFD is not configured is in Normal mode by default. 2 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. 3 When the local interface receives the echoed packet from the remote end, the local interface transitions to the Bi-directional state. 4 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 seconds. 5 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 Local State Remote State Local Admin Status Shutdown Normal Admin Unknown Shutdown Down Shutdown Aggressive Admin Unknown Up Shutdown FEFD enable Normal Bi- Bi- Up directional directional FEFD enable Aggressive Bi- Bi- Up directional directional FEFD + FEFD disable Normal Locally disabled Unknown Up FEFD + FEFD disable Aggressive Locally disabled Err-disabled Up Link Failure Normal Unknown Unknown Up Local Protocol Status Down Remote Admin Status Up Down Up Up Up Up Up Down Up Remote Protocol Status Down Down Up Up Down Up Up Down Down Up Down Layer 2 650