Guidelines For Monitoring Higig Link-Bundles - Dell C9000 Series Networking Configuration Manual

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.
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