Most likely your device is supporting the Juniper High Speed interface vendor cert... Is that true?
We use the IfXTable ifHighSpeed or IfTable ifSpeed to determine interface speed. If the ifHighSpeed is set and > 20, we use it, and multiply by 100000 to get bps.
If ifHighSpeed is not defined for the interface or < 20, we use ifSpeed value which is in bps already.
That value is used for both In and Out speeds. The IF tables don't have an In and Out OID we an use to differentiate.
Utilization uses this speed value in it's calculations. So if the SNMP agent is reporting the wrong speed, it can effect many diff expressions we calculate.
We do provide the option to override In and Out values separately, in case the device is reporting the wrong speeds. Can be done via DA rest, the PC UI, or DA admin UI.
Based on the images, it appears SNMP may not be giving us a IfXTable ifHighSpeed value for the interface, or maybe it's returning 20.
Can you use
http://DA:8581/dcdebug and gather the polling config and discovery logging for the device IP? We can see what the device is returning for ifHighSpeed and ifSpeed for that interface.
Original Message:
Sent: 11-18-2020 09:36 AM
From: Tao Yang
Subject: How interfaces speeds are decided for NetOps (PC CA)
I have a question regarding Juniper device interface speeds. I found some of the interface have 200-400% utilization, going to the interface page and found their speed are setting as 1.5MB, 10MB, 20MB, 1GB ect...
I found out most of these interfaces are either virtual port(VLAN) or a ohysical interface with sub-IF(also consider as virtual for Juniper?)
So I login to a Juniper device and check the interface spec, Ii picked interface ge-0/0/9 and it's sub-IF ge-0/0/9.0: