Users Guide

• %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
When configuring HiGig link-bundle monitoring on the backplane, follow these guidelines:
• 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 two 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 (0–11), npu-id specifies the NPU ID number (0), and HiGig port-channel ID which is in the range (0-2) for 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 slot /higig-port-channel-id, where slot specifies SFM slot number which is
in the range of 0 to 1, npu-id specifies the NPU ID number (0)
• 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.
• You can enable SNMP traps and syslog messages to be generated when an uneven traffic distribution is detected in a HiGig
link bundle.
• Traffic distribution in a HiGig link bundle is calculated as the bandwidth-weighted mean use of all links in the bundle. This
calculation is performed only on links that are up in their operational status.
• The rate interval used to poll traffic distribution in member links in a HiGig link bundle is user-configurable. The default
polling interval is 15 seconds.
• The trigger threshold specifies the percentage of total bundle bandwidth used to issue an alarm for uneven traffic
distribution. The default is 60 percent. When the mean link utilization is below this value, uneven link-bundle traffic is not
reported.
The difference in utilization percentage between the high-used link and low-used link determines the alarm condition.
Alarm reporting for link-bundle monitoring is based on the same algorithm used for LAG/ECMP. An alarm condition occurs
when the unevenness in link-bundle utilization exceeds 10 percent of the configured threshold and remains active until
traffic on member links falls below the trigger threshold. If unevenness is recorded for three consecutive measurements, an
alarm event is generated. The rate interval defines the time interval between measurements.
Enabling HiGig Link-Bundle Monitoring
To enable the monitoring of HiGig link bundles, follow these steps.
1 Enable the monitoring of traffic distribution on the member links in a HiGig link bundle (port-channel).
CONFIGURATION mode
Dell(conf)#hg-link-bundle-monitor {sfm npu-id hg-port—channel hg-port—channel-id | slot slot
npuUnit npu-id hg-port—channel 0} enable
2 Specify the trigger threshold for HiGig link-bundle monitoring.
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