Quick Reference Guide

190 PowerConnect B-Series TI24X Configuration Guide
53-1002269-02
Link Fault Signaling (LFS) for 10G
7
Setting the egress buffer threshold for a specific
QoS priority on a port or group of ports
NOTE
Be sure to disable the default settings before performing the tasks in this section. Refer to
“Disabling and re-enabling the default settings for egress buffer thresholds” .
To set the egress buffer threshold for a specific QoS priority on a port, enter commands such as the
following.
PowerConnect(config)#int e 3
PowerConnect(conf-if-e10000-3)#egress-buffer-threshold level-6 6
These commands set the egress buffer threshold for packets with QoS priority 6 to the level-6
threshold.
To set the egress buffer threshold for a specific QoS priority on multiple ports, enter commands
such as the following.
PowerConnect(config)#int e 4 to 5
PowerConnect(config-mif-4-5)#egress-buffer-threshold high 6
These commands set the egress buffer threshold for packets with QoS priority 6 to the high
threshold.
Syntax: [no] egress-buffer-threshold min|level-1|level-2|level-3|level-4|level-5|level-6|max
<QoS-priority>
For <QoS-priority>, enter a specific QoS priority (0 – 7).
Use the no form of the command to revert back to the default value for the QoS priority. For the
default values, refer to “Default settings for egress buffer thresholds” on page 188.
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 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.
NOTE
LFS is always enabled on PowerConnect B-Series TI24X devices and cannot be disabled.However,
as long as LFS is enabled on each end of the link regardless of the device type, a fault will be properly
detected and the link not used.
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, state down - link down
Interface ethernet1, 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.