Configuring Flow Exports on Juniper Devices

For NetFlow analysis, you need to configure your devices to export flows to Site24x7 On-Premise Poller, which is the NetFlow collector. The On-Premise Poller will be listening to the particular port to receive flows. Learn how to find the port number of your On-Premise Poller.

jFlow v5 and v8 configuration

To enable sampling and to export the flow records (cflowd/JFlow) to specific destination address, follow the below commands:

forwarding-options {
 sampling {
 input {
 family inet {
 rate 100;
 run-length 9;
 max-packets-per-second 7000;
 }
 }
 {
 cflowd <destination address>{
 port <port number>;
 source-address <source address>;
 version <version number>;
 no-local-dump;
 autonomous-system-type origin;
 }
 }
 }
}

To enable packet sampling on particular interfaces, follow the steps below:

interfaces {
 ge-1/3/0 {
 vlan-tagging;
 unit 101 {
 vlan-id 101;
 family inet {
 sampling {
 input;
 output;
 }
 address 206.80.253.26/25
 }
 }
 }
}

For more information and v9 configuration, refer to Juniper's official documentation.

sFlow configuration

Configure sFlow on Juniper devices using the following commands:

protocols {
sflow {
polling-interval 30;
sample-rate 500;
collector 10.1.2.5 {
udp-port 9996;
}
interfaces ge-0/0/0.0;
interfaces ge-0/0/1.0;
interfaces ge-0/0/2.0;
interfaces ge-0/0/3.0;
interfaces ge-0/0/11.0;
}
}