Addendum

You can use this optimal, cohesive capability in your network environment to detect 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.
You can use the mechanism to examine the working efficiency of the LAG bundle interfaces to adjust and
modify the switch for effective utilization of backplane links.
Alarms are generated if the port-channel threshold is greater than the configured threshold and the
unevenness is greater than 10 percent between 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 links for three successive rate-interval, multiplied by 3 time
intervals.
The following log messages are generated when the threshold for high-Gigabit port channel or LAG
bundle monitoring is 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, apart from the usual, standard details such
as module name and timestamp of generation:
• 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 is 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
Guidelines for Configuring the Mechanism to Monitor High-Gigabit Port
Channels
Keep the following points in mind when you activate and configure the capability to examine the
utilization and working-efficiency of backplane high-Gigabit Ethernet port channels as trunk groups:
• By default, the capability to monitor the traffic utilization and distribution of high-Gigabit Ethernet
trunk groups is disabled.
• Because each NPU unit in each line card (or control processor card) can contain multiple trunk
groups (high-Gigabit port channels). The interface specifier convention for hg-port-channel is slotId/
npuUnitId/localPortChannelId, which denote the slot, NPU, and the port channel identifiers.
• For Z9000, slotId (stack unitId) is constant and does not vary. NpuUnitId ranges from 0-5 and local
portChannelId ranges from 0-0 for leaf NpuUnits and 0-3 for spine NpuUnits.
• Link-bundle monitoring is commenced if monitoring is enabled for the bundle and when the bundle
egress utilization exceeds a threshold. This behavior is required if you want to view the utilization
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Link Aggregation Groups (LAGs)