Concept Guide

Link Bundle Monitoring
Monitoring linked LAG bundles allows trac distribution amounts in a link to be monitored for unfair distribution at any given time. A
threshold of 60% is dened as an acceptable amount of trac 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 congured:
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 trac 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 trac 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.
• An SFM (spine) NPU uses 10 HiGig link bundles, one link bundle to transmit data to each line-card (leaf) NPU. Each HiGig link bundle in
an SFM NPU consists of three HiGig links.
• A line-card (leaf) NPU supports 24 front-end I/O ports and 6 backplane HiGig ports. The six backplane links are members of 2 HiGig
link bundles that connect the line-card NPU to each SFM (spine) NPU. Three HiGig links in the bundle are used to connect to each
SFM NPU
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Interfaces