This article provides an example of configuring J-Flow on an SRX Series device. For other topics, go to the SRX Getting Started main page.
J-Flow versions 5, 8, and 9 are supported on SRX series devices.
J-Flow version 9 on standalone devices is supported as of:
SRX Branch devices (SRX1x0, SRX2x0, SRX550, SRX650)
Junos 10.4
SRX-HE devices (SRX1400, SRX3x00, SRX5x00)
Junos 12.1X45-D10
SRX3x0 & SRX550M
Junos 15.1X49-D30
SRX1500, SRX4100, SRX4200, vSRX
15.1X49-D80
SRX4600
Junos 17.4R1-S1
J-Flow version 9 on chassis cluster devices as of:
SRX Branch devices (SRX-300/320/340/345/380/550HM)
Junos 20.1R1
Junos 15.1X49-D80
Refer to the Feature Support Reference for supported versions and platforms, under Diagnostic Tools.
J-Flow does not require a license on SRX devices.
This section contains the following:
Configuration Examples
Application Note
Technical Documentation
Configuration example for J-Flow versions 5 and 8 :
The following procedure provides an example of the J-Flow configuration for versions 5 and 8 (this procedure should also work with NetFlow versions 5 and 8):
Enable sampling on one or more interfaces and specify the direction:
user@host# set interfaces ge-0/0/0 unit 0 family inet sampling input user@host# set interfaces ge-0/0/0 unit 0 family inet sampling output
Specify the sampling rate:
Caution : Activation of flow collection can have a significant impact on the performance of the SRX Series device. The smaller the sample rate, bigger the impact. It is recommended to not use a sampling input rate of 1.
user@host# set forwarding-options sampling input rate 100
Specify the UDP port number of the host that is collecting cflowd packets:
cflowd
user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 port 2056
Specify the version format: 5, 8, or 500 (ASN 500):
If version 5: user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 5 If version 500: user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 500 If version 8: user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 8 user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 aggregation source-destination-prefix caida-compliant
If version 5:
user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 5
If version 500:
user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 500
If version 8:
user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version 8 user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 aggregation source-destination-prefix caida-compliant
Configure the NTP server details:
user@host# set system ntp server 10.10.10.254
Configuration example for J-Flow version 9 for SRX-Branch standalone devices (SRX100, SRX110, SRX210, SRX220, SRX240, SRX550, SRX650)
Note: SRX Branch chassis clusters do not support the use of J-flow version 9.
The following procedure provides an example of the J-Flow configuration for version 9:
Note: For more information about this example, refer to the Application Note .
Configure the J-Flow v9 template (as of now, only the IPv4 template is supported):
user@host# set services flow-monitoring version9 template ipv4-test ipv4-template
Specify the sampling rate and run length:
user@host# set forwarding-options sampling input rate 100 user@host# set forwarding-options sampling input run-length 0
Configure the external flow collector and its port address. The J-Flow v9 template is associated with the external flow collector. Up to four flow collectors can be simultaneously configured:
user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 port 2222 user@host# set forwarding-options sampling family inet output flow-server 10.10.10.1 version9 template ipv4-test
Configure the inline-jflow, so that the sampling and the J-Flow service thread are implemented in the forwarding engine:
user@host# set forwarding-options sampling family inet output inline-jflow source-address 10.10.10.10
Configure the sampling filter on an interface (or interfaces) in the direction on which the J-Flow service is required:
user@host# set interfaces ge-0/0/14 unit 0 family inet sampling input user@host# set interfaces ge-0/0/14 unit 0 family inet address 2.2.2.1/24
Configuration example for J-Flow version 9 for SRX DataCenter devices (SRX1400, SRX1500, SRX3400, SRX3600, SRX4100, SRX4200, SRX5400, SRX5600, SRX5800)
Note: SRX DataCenter devices using Jflow9 require use of instance stanza under 'set forwarding-options sampling.'
user@host# set forwarding-options sampling instance instance1 input rate 100 user@host# set forwarding-options sampling instance instance1 input run-length 0
Configure the external flow collector and its port address. The J-Flow v9 template is associated with the external flow collector. Up to eight flow collectors can be configured on Junos OS version 12.3X48 and lower, but only four collectors are supported on 17.2 and later:
user@host# set forwarding-options sampling instance instance1 family inet output flow-server 10.10.10.1 port 2222 user@host# set forwarding-options sampling instance instance1 family inet output flow-server 10.10.10.1 version9 template ipv4-test
Configure the inline-jflow so that the sampling and the J-Flow service thread are implemented in the forwarding engine:
user@host# set forwarding-options sampling instance instance1 family inet output inline-jflow source-address 10.10.10.10
Juniper Flow Monitoring (includes diagrams of how J-Flow works and v9 configuration example)
Traffic Sampling, Forwarding, and Monitoring Overview
2020-12-03: Added SRX-Branch Jflow9 Chassis Cluster support
2019-03-06: Added clarification in step 3 of Datacenter instructions
2019-07-27: Updated document with current products and versions and removed old product references