Dell S4048T User Manual

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, (you can set each interval can be set between 3 and 300 seconds) 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. 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 50. 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 Down 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 Up 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 Unknown Unknown 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.
• Dell Networking OS supports FEFD on physical Ethernet interfaces only, excluding the management
interface.
• FEFD is not supported on Fibre Channel and copper Ethernet ports.
Layer 2 609

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)