{"id":18580,"date":"2019-01-30T11:08:21","date_gmt":"2019-01-30T11:08:21","guid":{"rendered":"https:\/\/made4it.com.br\/blog\/netflow-configuration-on-juniper-routers\/"},"modified":"2026-08-13T20:59:06","modified_gmt":"2026-08-13T20:59:06","slug":"netflow-configuration-on-juniper-routers","status":"publish","type":"post","link":"https:\/\/made4it.com.br\/en\/blog\/netflow-configuration-on-juniper-routers\/","title":{"rendered":"Netflow Configuration on Juniper Routers"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hello<\/p>\n\n<p class=\"wp-block-paragraph\">Today we&#8217;ll show you how to configure your Juniper router to export NetFlow (jFlow). At the end of the article, you&#8217;ll find the configuration using IPFIX (NetFlow v10). <\/p>\n\n<p class=\"wp-block-paragraph\">Here we have the Network topology and the Netflow Server information<\/p>\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/made4it.com.br\/wp-content\/uploads\/2026\/08\/netflow-1024x362-1.png\" alt=\"\"\/><figcaption class=\"wp-element-caption\">Netflow topology and information<\/figcaption><\/figure>\n\n<p class=\"wp-block-paragraph\">These are the steps needed to configure a Juniper Router to export Netflow v5<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Configure the NTP Server<\/li>\n\n\n\n<li>Configuring Forwarding Options with Sampling Rate<\/li>\n\n\n\n<li>Configure the Host that will receive the Flows coming from the Router<\/li>\n\n\n\n<li>Configure the interface to enable Netflow on the interface<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\"><br\/>Let&#8217;s go to the step-by-step configuration<\/p>\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\"><strong>1. Configure the NTP Server<\/strong><\/p>\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\">It is important to configure an NTP Server because the Flows data uses timestamp according to the router&#8217;s time. If the router has a different time than the server, the data will not agree with the time, generating a mismatch of information.<br\/><br\/>It is important that you configure at least 2 NTP servers and also your router&#8217;s timezone.<\/p>\n\n<pre class=\"wp-block-code\"><code><code>## Utilizando os Servidores do a.ntp.br e b.ntp.br\nset system ntp server 200.160.0.8\nset system ntp server 200.189.40.8\n\n## Configurando o Time-Zone\nset system time-zone America\/Sao_Paulo\n\n## Forma padr\u00e3o de visualizar a configura\u00e7\u00e3o do Juniper\nguilherme@vMX-BGP&gt; show configuration system\nsystem { \n time-zone America\/Sao_Paulo;\n\n\n ntp {\n     server 200.160.0.8;\n     server 200.189.40.8;\n }\n}<\/code><\/code><\/pre>\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\"><strong>2. Configure Forwarding Options with the Sampling Rate<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">The sampling rate is used to prevent CPU overload in your Routing Engine; it creates a sample of the traffic and exports it, allowing the NetFlow system to receive the data and apply a multiplication factor so that the data reflects actual numbers.<br\/><br\/>To configure this, use the commands. The ideal rate value depends on how much traffic you use; a good tip is to use values above 200 and monitor your router&#8217;s CPU usage. <\/p>\n\n<pre class=\"wp-block-code\"><code><code>## Aplicando o valor de Rate em 500\nset forwarding-options sampling input rate 500\n\n## Forma de visualiza\u00e7\u00e3o do Juniper sem display-set\nforwarding-options {\n     sampling {\n         input {\n             rate 500;\n         }<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\"><br\/><strong>3. Configure the Host that will receive the Flows coming from the Router<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">To configure your router to export NetFlow, you must specify the IP address of the server that will receive the flows and the UDP port on which it will receive this traffic.<br\/><br\/>To do this, use the following commands:<\/p>\n\n<pre class=\"wp-block-code\"><code><code>## Exportando para o IP 192.168.210.47 na porta 2055 e utilizando a vers\u00e3o 5 do netflow\nset forwarding-options sampling family inet output flow-server 192.168.210.47 port 2055\n set forwarding-options sampling family inet output flow-server 192.168.210.47 version 5\n\n## Visualiza\u00e7\u00e3o do Show sem display set\nguilherme@vMX-BGP&gt; show configuration forwarding-options\n sampling {\n     family inet {\n         output {\n             flow-server 192.168.210.47 {\n                 port 2055;\n                 version 5;\n             }\n         }\n     }\n }\n<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\"><br\/><strong>4. Configure the interface to enable Netflow on the interface<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">After configuring the sampling rate and the flow server, you still need to enable NetFlow on the interfaces from which it will generate data. Keep in mind that you must configure this command within each unit.<br\/>To do this, configure the interfaces within each unit using the following command: <\/p>\n\n<pre class=\"wp-block-preformatted\"><code>### Aplicar o comando sampling input<br\/> set interfaces ge-0\/0\/1 unit 0 family inet sampling input<br\/><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\"><br\/><strong>The complete configuration looks like this:<\/strong><\/p>\n\n<pre class=\"wp-block-code\"><code><code>guilherme@vMX-BGP&gt; show configuration | display set\n set system time-zone America\/Sao_Paulo\n set system ntp server 200.160.0.8\n set system ntp server 200.189.40.8\n \nset interfaces ge-0\/0\/0 description \"Fala com o Netflow\"\n set interfaces ge-0\/0\/0 unit 0 family inet address 192.168.210.49\/24\n \nset interfaces ge-0\/0\/1 description \"INTERFACE WAN - TRANSITO IP\"\n set interfaces ge-0\/0\/1 unit 0 family inet sampling input\n set interfaces ge-0\/0\/1 unit 0 family inet address 200.200.200.1\/30\n \nset forwarding-options sampling input rate 500\n set forwarding-options sampling family inet output flow-server 192.168.210.47 port 2055\n set forwarding-options sampling family inet output flow-server 192.168.210.47 version 5\n\n\n## Forma de show do Juniper\nguilherme@vMX-BGP&gt; show configuration\n Last commit: 2019-01-30 13:30:01 BRST by guilherme\n version 17.1R2.7;\n system {\n     host-name vMX-BGP;\n     time-zone America\/Sao_Paulo;\n     ntp {\n         server 200.160.0.8;\n         server 200.189.40.8;\n     }\n }\n interfaces {\n     ge-0\/0\/0 {\n         description \"Fala com o Netflow\";\n         unit 0 {\n             family inet {\n                 address 192.168.210.49\/24;\n             }\n         }\n     }\n     ge-0\/0\/1 {\n         description \"INTERFACE WAN - TRANSITO IP\";\n         unit 0 {\n             family inet {\n                 sampling {\n                     input;\n                 }\n                 address 200.200.200.1\/30;\n             }\n         }\n     }\n }\n forwarding-options {\n     sampling {\n         input {\n             rate 500;\n         }\n         family inet {\n             output {\n                 flow-server 192.168.210.47 {\n                     port 2055;\n                     version 5;\n                 }\n             }\n         }\n     }\n }<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\"><br\/>To make things even easier, we have a video demonstrating how to configure each command covered in this tutorial<\/p>\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube aligncenter wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Configura\u00e7\u00e3o de Netflow - Jflow em Roteadores Juniper\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/VIWQZISAbqM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">Netflow configuration on Juniper<\/figcaption><\/figure>\n\n<p class=\"wp-block-paragraph\">As a bonus, we&#8217;ll post the IPFIX configurations for a few types of routers<\/p>\n\n<h5 class=\"wp-block-heading\"><br\/>Juniper MX204<\/h5>\n\n<p class=\"wp-block-paragraph\">For routers such as the MX204, you can use IPFIX (NetFlow v10). To configure this on the MX204, use the commands and modify the Flow-server and source address IPs. <\/p>\n\n<pre class=\"wp-block-code\"><code><code> set services flow-monitoring version-ipfix template MADE4FLOW flow-active-timeout 60\n set services flow-monitoring version-ipfix template MADE4FLOW flow-inactive-timeout 15\n set services flow-monitoring version-ipfix template MADE4FLOW template-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW option-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW ipv4-template\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 flow-active-timeout 60\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 flow-inactive-timeout 15\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 template-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 option-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 ipv6-template\n set chassis fpc 0 sampling-instance MADE4FLOW\n set chassis fpc 0 inline-services flow-table-size ipv4-flow-table-size 10\n set chassis fpc 0 inline-services flow-table-size ipv6-flow-table-size 5\n set forwarding-options sampling instance MADE4FLOW input rate 1000\n set forwarding-options sampling instance MADE4FLOW input run-length 0\n set forwarding-options sampling instance MADE4FLOW input max-packets-per-second 10000\n set forwarding-options sampling instance MADE4FLOW family inet output flow-inactive-timeout 15\n set forwarding-options sampling instance MADE4FLOW family inet output flow-active-timeout 60\n set forwarding-options sampling instance MADE4FLOW family inet output flow-server 10.1.1.1 port 2055\n set forwarding-options sampling instance MADE4FLOW family inet output flow-server 10.1.1.1 autonomous-system-type origin\n set forwarding-options sampling instance MADE4FLOW family inet output flow-server 10.1.1.1 version-ipfix template MADE4FLOW\n set forwarding-options sampling instance MADE4FLOW family inet output inline-jflow source-address 10.1.1.2\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-inactive-timeout 15\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-active-timeout 60\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-server 10.1.1.1 port 2055\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-server 10.1.1.1 autonomous-system-type origin\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-server 10.1.1.1 version-ipfix template MADE4FLOW-v6\n set forwarding-options sampling instance MADE4FLOW family inet6 output inline-jflow source-address 10.1.1.2\n\n<strong>### Em cada interface e cada unit adicionar os comandos<\/strong>\n set interfaces xe-2\/0\/0 unit 151 family inet sampling input\n set interfaces xe-2\/0\/0 unit 151 family inet6 sampling input\n<\/code><\/code><\/pre>\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n<h5 class=\"wp-block-heading\"><br\/>Juniper MX104<\/h5>\n\n<p class=\"wp-block-paragraph\">To configure the Juniper MX104 use the commands below. Remember that MX104 only supports exporting to 1 Netflow Server with IPFIX. <\/p>\n\n<pre class=\"wp-block-code\"><code><code> set services flow-monitoring version-ipfix template MADE4FLOW flow-active-timeout 60\n set services flow-monitoring version-ipfix template MADE4FLOW flow-inactive-timeout 30\n set services flow-monitoring version-ipfix template MADE4FLOW template-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW option-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW ipv4-template\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 flow-active-timeout 60\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 flow-inactive-timeout 30\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 template-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 option-refresh-rate seconds 30\n set services flow-monitoring version-ipfix template MADE4FLOW-v6 ipv6-template\n set forwarding-options sampling instance MADE4FLOW input rate 500\n set forwarding-options sampling instance MADE4FLOW input run-length 0\n set forwarding-options sampling instance MADE4FLOW family inet output flow-inactive-timeout 15\n set forwarding-options sampling instance MADE4FLOW family inet output flow-active-timeout 60\n set forwarding-options sampling instance MADE4FLOW family inet output flow-server 10.1.1.1 port 2055\n set forwarding-options sampling instance MADE4FLOW family inet output flow-server 10.1.1.1 version-ipfix template MADE4FLOW\n set forwarding-options sampling instance MADE4FLOW family inet output inline-jflow source-address 10.1.1.2\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-inactive-timeout 15\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-active-timeout 60\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-server 10.1.1.1 port 2055\n set forwarding-options sampling instance MADE4FLOW family inet6 output flow-server 10.1.1.1 version-ipfix template MADE4FLOW-v6\n set forwarding-options sampling instance MADE4FLOW family inet6 output inline-jflow source-address 10.1.1.2\n set chassis afeb slot 0 sampling-instance MADE4FLOW\n\n<strong> ## Em cada interface do seu roteador utilizar os comandos<\/strong>\n set interfaces xe-2\/0\/0 unit 151 family inet sampling input\n set interfaces xe-2\/0\/0 unit 151 family inet6 sampling input<\/code><\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">If you have a router that isn&#8217;t listed here, please send an email to comercial@made4it.com.br, and we&#8217;ll send you the settings.<br\/>I hope this helped, and see you next time.<br\/>Best regards.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello Today we&#8217;ll show you how to configure your Juniper router to export NetFlow (jFlow). At the end of the article, you&#8217;ll find the configuration using IPFIX (NetFlow v10). Here we have the Network topology and the Netflow Server information These are the steps needed to configure a Juniper Router to export Netflow v5 Let&#8217;s go to the step-by-step configuration 1. Configure the NTP Server It is important to configure an NTP Server because the Flows data uses timestamp according to the router&#8217;s time. If the router has a different time than the server, the data will not agree with the time, generating a mismatch of information. It is important that you configure at least 2 NTP servers and also your router&#8217;s timezone. 2. Configure Forwarding Options with the Sampling Rate The sampling rate is used to prevent CPU overload in your Routing Engine; it creates a sample of the traffic and exports it, allowing the NetFlow system to receive the data and apply a multiplication factor so that the data reflects actual numbers. To configure this, use the commands. The ideal rate value depends on how much traffic you use; a good tip is to use values above 200 and monitor your router&#8217;s CPU usage. 3. Configure the Host that will receive the Flows coming from the Router To configure your router to export NetFlow, you must specify the IP address of the server that will receive the flows and the UDP port on which it will receive this traffic. To do this, use the following commands: 4. Configure the interface to enable Netflow on the interface After configuring the sampling rate and the flow server, you still need to enable NetFlow on the interfaces from which it will generate data. Keep in mind that you must configure this command within each unit.To do this, configure the interfaces within each unit using the following command: ### Aplicar o comando sampling input set interfaces ge-0\/0\/1 unit 0 family inet sampling input The complete configuration looks like this: To make things even easier, we have a video demonstrating how to configure each command covered in this tutorial As a bonus, we&#8217;ll post the IPFIX configurations for a few types of routers Juniper MX204 For routers such as the MX204, you can use IPFIX (NetFlow v10). To configure this on the MX204, use the commands and modify the Flow-server and source address IPs. Juniper MX104 To configure the Juniper MX104 use the commands below. Remember that MX104 only supports exporting to 1 Netflow Server with IPFIX. If you have a router that isn&#8217;t listed here, please send an email to comercial@made4it.com.br, and we&#8217;ll send you the settings.I hope this helped, and see you next time.Best regards.<\/p>\n","protected":false},"author":5,"featured_media":21259,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[902,919],"tags":[982,983,984,985,986,987,988,938,989,940,941],"class_list":["post-18580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-netflow","category-routers","tag-how-to-configure-netflow-on-juniper","tag-how-to-configure-netflow-on-juniper-mx","tag-how-to-configure-netflow-on-mx204","tag-ipfix","tag-ipfix-mx204","tag-jflow","tag-jflow-juniper","tag-netflow","tag-netflow-juniper","tag-netflow-v5","tag-netflow-v9"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Configure Netflow (jFlow) em roteadores Juniper passo a passo: NTP, sampling rate, flow-server e interfaces. 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