Addendum

alarms only when the utilization levels are high. At low utilization levels, it is possible that there are
only one or two significant flows can cause unevenness. Such an imbalanced traffic flow is not critical
or indicative of a problem. The higig link bundle trigger threshold is a system-wide or a global setting
for the device.
• If you enabled the generation of SNMP traps, syslogs and traps are transmitted when an uneven
distribution is observed. Another syslog and trap is generated when the unevenness is cleared.
• Link bundle utilization is calculated as the bandwidth-weighted mean utilization of all links in a bundle
(calculated as [total bandwidth of all links / total bytes-per-sec of all links]). This calculation is
performed only on those links that are up on their operational status.
• Rate Interval for polling the traffic statistics for member links of the high-Gigabit port channel needs
to be configured. The default hiGig stats polling interval is 15 seconds. This interval cannot be
configured per high-Gigabit port channel and is applicable for all of the high-Gigabit port channels on
the system.
• The treshold value identifies when to start the link bundle utilization calculation trigger (default of 60
percent). When overall utilization (mean) is below this value, link bundle distribution unevenness will
not be reported.
• If unevenness is observed over 3 consecutive measurements, an alarm event shall be generated. The
time interval between 2 measurements is defined by the rateInterval for Hg stats polling (default 15
seconds). Alarm clear is sent when evenness is observed for three successive rate intervals. If
individual link utilization information is not available for a given timestamp, link bundle utilization will
not be calculated at that time stamp. The previous known record shall be used for the alarm
calculation.
• Turning on and off the link bundle monitoring is performed at a high-Gigabit Ethernet port-channel
level configuration.
• The difference of utilization % between the high used link and low used link is used to determine the
alarm condition. The alarm trigger reporting is based on the same algorithm used for link bundle
monitoring on LAG/ECMP. The alarm reporting is triggered when the configured threshold is crossed
for a given bundle. At this time, if the delta utilization is beyond 10%, alarm is raised. The alarm
condition remains active until all interface utilizations are within the band or until the overall utilization
goes below the trigger threshold. An alarm is not raised or cleared instantaneously
Enabling the Verification of Member Links Utilization in a
High-Gigabit Port Channel
This procedure is supported on the Z9000 platform.
To activate the mechanism to examine the working efficiency of the high-Gigabit Ethernet port channel
interfaces, do the following
1. Use the hg-link-bundle-monitor slot slotId npuUnit npuUnitId hg-port-channel
portChannelId enable command in Global Configuration mode to enable this functionality to
detect the working efficiency of the high-Gigabit port channel bundle interfaces.
CONFIGURATION mode
Dell(conf)#hg-link-bundle-monitor slot 0 npuUnit 0 hg-port-channel 0 enable
2. Specify the trigger threshold for higig link bundle monitoring.
CONFIGURATION mode
Dell(conf)#hg-link-bundle-monitor trigger-threshold 30
Link Aggregation Groups (LAGs)
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