NetFlow/J-Flow/IPFIX/sFlow

Owned by Jean-luc KRIKER
Last updated: Dec 09, 2018
1 min read

https://www.plixer.com/blog/scrutinizer/juniper-srx-series-gateway-supports-j-flow/


1. Enable sampling on desired interface(s) and directions:

set interfaces ge-0/0/0 unit 0 family inet sampling input
set interfaces ge-0/0/0 unit 0 family inet sampling output


2. Specify sampling rate and where to send the J-Flow data:

      #Specify sampling rate.

Caution:

      Activation of Flow collection can have a significant impact on the performance of the SRX device. The smaller the sample rate, the bigger the impact .  A sampling input rate of 1 is

not

      recommended.

set forwarding-options sampling input rate 100

#Specify UDP port number of host collecting cflowd packets
set forwarding-options sampling family inet output flow-server 192.168.1.5 port 9996

#Specify version format: 5, 8 or 500 (ASN 500)
set forwarding-options sampling family inet output flow-server 192.168.1.5 version 5

For a sample configuration, please check our FAQ archive for enabling flow export on a Juniper router.