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You can enable the capability to detect uneven traffic distribution in the member links of a HiGig link
bundle on a line-card or SFM NPU. You can also enable a notification to be sent using alarms and SNMP
traps. The algorithm used to determine uneven distribution of traffic is predefined.
Monitoring HiGig link bundles allows you to view and analyze unequal traffic flow in backplane port
channels and take corrective action. Alarms are generated if the link-bundle traffic 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 when the link-bundle threshold is lower than the
configured threshold and the unevenness is less than 10 percent between links for three successive rate
intervals.
An alarm includes the following information:
• Line-card or SFM NPU unit and HiGig port-channel ID in the format: hg-port-channel slot
slot/npu-id/hg-port—channel-id
• Alarm: triggered or cleared
Examples of the system log messages triggered when the threshold for a HiGig link bundle/port channel
is exceeded are:
• %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 Monitoring HiGig Link-Bundles
Take the following considerations into account when you configure HiGig link-bundle monitoring on the
backplane:
• By default, the capability to monitor the traffic distribution in a HiGig link bundle on a line-card or SFM
NPU is disabled.
• Each line-card NPU uses a single HiGig link bundle for its backplane links to connect each SFM (spine)
NPU. The convention used to identify a HiGig link-bundle interface is: hg-port-channel slot/npu-id/0,
where slot specifies the line-card slot number (0–2), npu-id specifies the NPU ID number (0–3), and 0
specifies the HiGig port-channel ID which is always 0 on a line-card NPU.
• Each SFM NPU uses a separate HiGig link bundle to connect to each line-card (leaf) NPU. The
convention used to identify a HiGig link-bundle interface is: hg-port-channel 0/npu-id/higig-port-
channel-id, where 0 specifies the SFM slot number which is always 0, npu-id specifies the NPU ID
number (0–5), and higig-port-channel-id specifies the HiGig port-channel ID on an SFM NPU (0–10).
• HiGig link-bundle monitoring starts only when:
– You enable monitoring for a specified HiGig link bundle using the hg-link-bundle monitor
command.
– Bundle usage for egress traffic exceeds the threshold configured with the hg-link-bundle
monitor trigger-threshold command.
Alarms are generated only when link-bundle traffic levels are high. At low traffic levels, only one or
two significant flows may cause unevenness. However, uneven traffic distribution across links during
low-traffic periods is not critical and does not trigger an alarm.
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