Deployment Guide

In an NPU unit, port numbering of HiGig ports starts from the last front-end I/O port number used.
Use the show hardware sfm hg-stats and show hardware linecard hg-stats commands to display traffic
statistics about the HiGig links on a line-card or SFM NPU.
Use the clear hardware sfm hg-stats and clear hardware linecard hg-stats commands to reset HiGig port
statistics.
Link Bundle Monitoring
Monitoring linked LAG bundles allows traffic distribution amounts in a link to be monitored for unfair distribution at any given
time. A threshold of 60% is defined as an acceptable amount of traffic on a member link.
Links are monitored in 15-second intervals for three consecutive instances. A syslog and an alarm will be activated when the
average of the bundle utilization is greater than the trigger threshold, and the delta deviation between the lowest and highest
utilized links that part of the ECMP or the Port-Channel is > 10% When the deviation clears, another Syslog sends and a clear
alarm event generates.
The link bundle utilization is calculated as the total bandwidth of all links divided by the total bytes-per-second of all links. If
you enable monitoring, the utilization calculation is performed when the utilization of the link-bundle (not a link within a bundle)
exceeds 60%.
To enable and view link bundle monitoring, use the following commands.
● Enable link bundle monitoring.
ecmp-group
● View all LAG link bundles being monitored.
show running-config ecmp-group
Link bundle monitoring can be also enable on port-channels, here it is the way it can be configured:
interface Port-channel 111
no ip address
switchport
no shutdown
link-bundle-monitor enable
To view the links that are being monitored, use the show link-bundle-distribution command.
Dell(conf-if-po-111)#do show link-bundle-distribution
Link-bundle trigger threshold - 22
LAG bundle - 111 Utilization[In Percent] - 25 Alarm State - Active
Interface Line Protocol Utilization[In Percent]
PeGi 255/1/36 Up 25
PeGi 255/1/37 Up 25
PeGi 255/2/38 Up 25
PeGi 255/2/39 Up 50
PeGi 255/3/40 Up 0
PeGi 255/3/45 Up 25
Monitoring HiGig Link Bundles
You can monitor the HiGig link bundles that transmit data between internal backplane ports on line-card (leaf) and switch
fabric module (SFM - spine) network processing units (NPUs) and generate a system log message or SNMP trap when traffic
distribution in a link bundle is uneven. Each NPU is a Trident chip.
On the switch, backplane port channels operate as HiGig link bundles to transmit data traffic between line-card and SFM NPUs.
There are 11 line-card and 2 SFM NPUs. The two SFM (spine) NPUs include the switch fabric module.
Each line-card use one NPU numbered 0. SFM NPUs are numbered 0 to 1.
Line-card and SFM NPUs use HiGig link bundles to transmit data.
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Interfaces