White Papers

● 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% 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 time interval between measurements is defined by the rate interval.
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.
CONFIGURATION mode
Dell(conf)#hg-link-bundle-monitor trigger-threshold percentage
3. Specify the interval (in seconds) when HiGig link-bundle monitoring is performed.
CONFIGURATION mode
Dell(conf)#hg-link-bundle-monitor rate-interval seconds
4. Enable SNMP trap generation for HiGig link-bundle monitoring.
CONFIGURATION mode
Dell(conf)#snmp-server enable traps hg-lbm
5. Display the traffic utilization of member links in a HiGig link bundle (port channel).
EXEC, EXEC Privilege modes
Dell#show hg-link-bundle-distribution {sfm npu-id hg-port—channel hg-port—channel-id |
slot slot npuUnit npu-id hg-port—channel 0}
Non Dell-Qualified Transceivers
The system supports Dell-qualified transceivers and only some of the non Dell-qualified transceivers.
If the system displays an error message similar to the following, the transceiver is not Dell-qualified. The Dell EMC Networking
OS places the interface in error-disabled (operationally down) state.
Apr 29 05:09:16: %S4048-ON:1 %IFAGT-2-TRANSCEIVER_UNSUPPORTED_ERROR: Transceiver in slot
1 port 50 unrecognized, putting interface in operational-down state
The following command output displays that the interface is in error-disabled state:
DellEMC#show interfaces fortyGigE 1/50
fortyGigE 1/50 is up, line protocol is down(error-disabled[Transceiver Unsupported])
Hardware is DellEMCEth, address is 34:17:eb:f2:25:c6
Current address is 34:17:eb:f2:25:c6
Non-qualified pluggable media present, QSFP type is 40GBASE-SR4
Wavelength is 850nm
No power
390
Interfaces