Dell FCX624-S Laptop User Manual


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330 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Link Fault Signaling (LFS) for 10G
9
For fiber-optic connections, you can optionally configure a transmit port to notify the receive port on
the remote device whenever the transmit port becomes disabled.
When you enable this feature, the transmit port notifies the remote port whenever the fiber cable is
either physically disconnected or has failed. When this occurs and the feature is enabled, the
device disables the link and turns OFF both LEDs associated with the ports.
By default, RFN is enabled.
You can configure RFN as follows:
Globally, on the entire device
On a trunk group
On an individual interface
Enabling and disabling remote fault notification
RFN is ON by default. To disable RFN, use the following command.
PowerConnect(config)#interface e 0/1/1
PowerConnect(config-if-e1000-0/1/1)#gig-default neg-off
To re-enable RFN, use the following command.
PowerConnect(config)#interface e 0/1/1
PowerConnect(config-if-e1000-0/1/1)#gig-default auto-gig
Syntax: gig-default neg-off | auto-gig
For more information about the parameters supported with the gig-default command, see
“Changing the Gbps fiber negotiation mode” on page 46.
Link Fault Signaling (LFS) for 10G
Link Fault Signaling (LFS) is a physical layer protocol that enables communication on a link
between two 10 Gbps Ethernet devices. When configured on a Dell PowerConnect 10 Gbps
Ethernet port, the port can detect and report fault conditions on transmit and receive ports. Dell
recommends enabling LFS on both ends of a link.
When LFS is enabled on an interface, the following Syslog messages are generated when the link
goes up or down, or when the TX or RX fiber is removed from one or both sides of the link that has
LFS enabled.
Interface ethernet1/1, state down - link down
Interface ethernet1/1, state up
When a link fault occurs, the Link and Activity LEDs turn OFF.
The Link and Activity LEDs turn ON when there is traffic traversing the link after the fiber is
installed.
Enabling LFS
To enable LFS between two 10 Gbps Ethernet devices, enter commands such as the following on
both ends of the link.