Reference Guide

The Dell Networking OS already contains the functionality to monitor the performance and traffic
handling of virtual interfaces created as LAG bundles and ECMP configured on physical user ports. You
can now verify the traffic distribution and processing of high-Gigabit Ethernet port channels. Trunk
groups for backplane hiGig link bundles between the leaf and spines are created. To provision trunk
groups on Z9000 platforms, one trunk group (hiGig link bundle) on each leaf unit is created and four
trunk groups on each spine unit are created. A total of 12 trunk groups are present on the two spines and
four leafs of the Z9000 platform.
Based on the specified hashing algorithm, traffic in the trunk groups is distributed. It is possible that an
unequal or imbalanced traffic distribution in hiGig trunk groups may occur. When you configure the
method to monitor the high-Gigabit Ethernet port channel and trunk groups, you can view and analyze
the unequal traffic split and flow in the trunk groups and take corrective action.
This capability detects whether the configured applications or utilities are causing traffic to be unevenly
distributed on a hiGig link bundle for best performance. This capability to monitor the port channel
bundles is applicable for any platform that contains backplane high-Gigabit Ethernet links.
The collected and derived data rates for the configured rate-interval monitor and examine the working
efficiency and traffic-handling capacity of the LAG bundles on high-Gigabit Ethernet trunk interfaces that
are created statically.
To adjust and modify the switch for effective utilization of backplane links, examine the working
efficiency of the LAG bundle interfaces.
Alarms are generated if the port-channel threshold is greater than the configured threshold, and the
unevenness is greater than 10 percent between the links for three successive rate-intervals.
Alarms are removed if the port-channel threshold becomes lower than the configured threshold, and the
unevenness is less than 10 percent between the links for three successive rate-intervals, multiplied by
three time intervals.
The following log messages are generated when the threshold for high-Gigabit port channel or LAG
bundle monitoring has exceeded:
• An informational message when an alarm is triggered for uneven distribution observed in a LAG
bundle
• An informational message when the alarm is cleared
The following additional information is recorded in the alarm:
• Link bundle name (hg-port-channel slot/NpuId/BundleId)
• Alarm raising or clearing
The following examples display the system log messages triggered when the threshold for high-Gigabit
port channel monitoring has exceeded:
• %STKUNIT0-M:CP %SWMGR-5-HG-BUNDLE_UNEVEN_DISTRIBUTION: Found uneven distribution
in hg-port-channel 0/5/0
• %STKUNIT0-M:CP %SWMGR-5-HG-BUNDLE_UNEVEN_DISTRIBUTION_ALARM_CLEAR: Uneven
distribution in hg-port-channel 0/5/0 got cleared
Link Aggregation Control Protocol (LACP)
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