Configuring Fefd; Important Points To Remember - Dell Force10 Z9000 Configuration Manual

Ftos configuration guide for z9000 system

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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

globally or one interface at a time) before the FEFD enabled system can become operational again.

Table 24-1. State Changes When Configuring FEFD

FEFD + FEFD disable

Link Failure

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.