Configuration Guide User guide

604 FastIron Configuration Guide
53-1002494-02
Link Fault Signaling for 10Gbps Ethernet devices
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.
Brocade(config)#interface e 0/1/1
Brocade(config-if-e1000-0/1/1)#gig-default neg-off
To re-enable RFN, use the following command.
Brocade(config)#interface e 0/1/1
Brocade(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 59.
Link Fault Signaling for 10Gbps Ethernet devices
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 Brocade 10 Gbps Ethernet port, the
port can detect and report fault conditions on transmit and receive ports. Brocade recommends
enabling LFS on both ends of a link.
LFS is disabled by default on all Brocade FastIron devices.
NOTE
Enable LFS on any device prior to connecting that device with FastIron platforms. FastIron platforms
have LFS enabled by default and it cannot be disabled; any connecting device must have LFS
currently enabled to ensure interoperability.
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.