Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 561
FEFD state changes, Important Points to Remember, Table 28-1., State Changes When Configuring FEFD
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FEFD state changes FEFD enabled systems (comprised of one or more interfaces) will automatically switch between four different modes: Idle, Unknown, Bi-directional, and Err-disabled. 1. An interface on which FEFD is not configured is in Idle state. 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 28-1. State Changes When Configuring FEFD Local Event Mode Local State Local Local Remote Remote Admin Protocol Admin Protocol Remote State Status Status Status Status Shutdown Normal Admin Shutdown Unknown Down Down Up Down Shutdown Aggressive Admin Shutdown Err-disabled Up Down Up Down FEFD enable Normal Bi-directional Bi-directional Up Up Up Up FEFD enable Aggressive Bi-directional Bi-directional Up Up Up Up FEFD + FEFD disable Normal Locally disabled Unknown Up Down Up Down FEFD + FEFD disable Aggressive Locally disabled Err-disabled Up Down Up Down Link Failure Normal Unknown Unknown Up Down Up Down Link Failure Aggressive Err-disabled Err-disabled Up Down Up 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. Layer 2 | 561
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