0 Replies Latest reply on Jul 27, 2015 9:20 AM by abochmann

    Juniper switches - sFlow adaptive sampling rate

    abochmann

      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     IngressEgressIngress
      xe-0/0/0.0  Enabled Enabled5000 5000     8000080000    30
      xe-0/0/1.0  Enabled Enabled5000 5000     4000040000    30
      xe-0/0/10.0 Enabled Enabled5000 5000     160000      16000030
      xe-0/0/11.0 Enabled Enabled5000 5000     8000080000    30
      xe-0/0/12.0 Enabled Enabled5000 5000     160000      16000030
      xe-0/0/35.0 Enabled Enabled5000 5000     320000      32000030

       

      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