Dell S6000 FTOS 9.0(2.0) Configuration Guide for the System - Page 532

www.dell.com | support.dell.com FEFD state changes FEFD has two operational modes, Normal and Aggressive. When Normal mode is enabled on an interface an a far-end failure is detected, no intervention is required to reset the interface to bring it back to an FEFD operational state.When Aggressive mode is enabled on an interface in the same state, manual intervention is required to reset the interface. FEFD enabled systems (comprised of one or more interfaces) will automatically switch 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. 2. Once FEFD is enabled 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, (each interval can be set between 3 and 300 seconds by the user) the state changes to unknown. 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. All interfaces in the Err-disabled state must be manually reset 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 26-1. State Changes When Configuring FEFD Local Event Shutdown Shutdown FEFD enable FEFD enable FEFD + FEFD disable FEFD + FEFD disable Link Failure Link Failure Mode Local State Local Local Remote Remote Admin Protocol Admin Protocol Remote State Status Status Status Status Normal Admin Shutdown Unknown Down Down Up Aggressive Admin Shutdown Err-disabled Up Down Up Normal Bi-directional Bi-directional Up Up Up Aggressive Bi-directional Bi-directional Up Up Up Normal Locally disabled Unknown Up Down Up Aggressive Locally disabled Err-disabled Up Down Up Normal Unknown Unknown Up Down Up Aggressive Err-disabled Err-disabled Up Down Up Down Down Up Up Down Down Down Down Important Points to Remember • FEFD enabled ports are subject to an 8 to 10 second delay during an RPM failover before becoming operational. • FEFD can be enabled globally or on a per interface basis; interface FEFD configurations override global FEFD configurations. • FTOS supports FEFD on physical Ethernet interfaces only, excluding the management interface. 510 | Layer 2