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How to enable flow on your Juniper MX router -- AuvikFlow (Kentik)


This sample configuration is based on a Juniper MX80 series router. Other models may have slight configuration variations.

If you're collecting flow from multiple devices sharing the same public IP, you must configure chfagent to send flow to Kentik.

These instructions assume:

    • You have Telnet / SSH credentials and access to your Juniper router.
    • You have your enable password, if applicable.
    • The device has already been added to your AuvikFlow (Kentik) integration.
    • The sampling rate will be set to 1024.

Access your switch’s CLI

  • Telnet or SSH into your Juniper router.
  • Enter configuration mode by typing “configure”. Enter your configuration password, if necessary.

Configure NetFlow

In this section, we’ll:

  • Associate a sampling instance with the Forwarding Engine Processor.
  • Configure a sampling instance for the flow server and inline Jflow instances.
  • Set the flow server IP and port number.
  • Enable flow monitoring and specify the source address for the traffic.
  • Specify the output properties.

For the “jflow source-address”, enter the IP address of the router.

Type the following in your router:

set chassis tfeb slot 0 sampling-instance sampling-ins1
edit instance inline_sample
set rate 1024
edit flow-server
set port 20013
set inline-jflow source-address <address of router>
set version-ipfix

All done.


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