Our Juniper EX switches are configured for sFlow sampling, and send this data to an NPM instance running NTA 4.1.0. This works fine in principle, but I wonder if the data is correct: Juniper switches use an adaptive sampling rate, per interface, depending on interface load. In NTA, under NetFlow Settings -> Manage NetFlow Sources, it seems that Orion assumes a global sampling rate for each system. Is that just a display problem, and NTA correctly calculates with current rate for each sFlow sample, or does it use the auto-detected sample rate for all data for that switch? Example from show sflow interfaces on a Juniper switch: Interface Status Sample rate Adapted sample rate Polling interval Egress Ingress Egress Ingress Egress Ingress xe-0/0/0.0 Enabled Enabled 5000 5000 80000 80000 30 xe-0/0/1.0 Enabled Enabled 5000 5000 40000 40000 30 xe-0/0/10.0 Enabled Enabled 5000 5000 160000 160000 30 xe-0/0/11.0 Enabled Enabled 5000 5000 80000 80000 30 xe-0/0/12.0 Enabled Enabled 5000 5000 160000 160000 30 xe-0/0/35.0 Enabled Enabled 5000 5000 320000 320000 30 At the same time, NTA shows this (when I expand one of the systems, I see the above sFlow interfaces, but no sample rate attached to the interfaces themselves:

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Juniper switches - sFlow adaptive sampling rate

abochmann over 8 years ago

Our Juniper EX switches are configured for sFlow sampling, and send this data to an NPM instance running NTA 4.1.0. This works fine in principle, but I wonder if the data is correct:

Juniper switches use an adaptive sampling rate, per interface, depending on interface load. In NTA, under NetFlow Settings -> Manage NetFlow Sources, it seems that Orion assumes a global sampling rate for each system.

Is that just a display problem, and NTA correctly calculates with current rate for each sFlow sample, or does it use the auto-detected sample rate for all data for that switch?

Example from show sflow interfaces on a Juniper switch:

Interface Status	Sample rate			Adapted sample	rate	Polling interval
	Egress Ingress	Egress	Ingress	Egress	Ingress
xe-0/0/0.0	Enabled Enabled	5000	5000	80000	80000	30
xe-0/0/1.0	Enabled Enabled	5000	5000	40000	40000	30
xe-0/0/10.0	Enabled Enabled	5000	5000	160000	160000	30
xe-0/0/11.0	Enabled Enabled	5000	5000	80000	80000	30
xe-0/0/12.0	Enabled Enabled	5000	5000	160000	160000	30
xe-0/0/35.0	Enabled Enabled	5000	5000	320000	320000	30

At the same time, NTA shows this (when I expand one of the systems, I see the above sFlow interfaces, but no sample rate attached to the interfaces themselves:

orion juniper sample rate.jpg