Reference Guide

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 38. State Change When Configuring FEFD
Local Event Mode Local State Remote
State
Local Admin
Status
Local
Protocol
Status
Remote
Admin Status
Remote
Protocol
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.
• You can enable FEFD 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.
Configuring FEFD
You can configure FEFD for all interfaces from CONFIGURATION mode, or on individual interfaces from INTERFACE
mode.
To enable FEFD globally on all interfaces, use the following command.
• Enable FEFD globally on all interfaces.
CONFIGURATION mode
fefd-global
To report interval frequency and mode adjustments, use the following commands.
1. Setup two or more connected interfaces for Layer 2 or Layer 3.
INTERFACE mode
ip address ip address, switchport
2. Activate the necessary ports administratively.
INTEFACE mode
488