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https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/sflow-acx5k-series-cli.html

EX sflow:

https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/collector-edit-protocols-sflow-ex-series.html

user@switch# set collector <ip-address>
user@switch# set collector udp-port <port-number>
user@switch# set interfaces interface-name
user@switch# set polling-interval seconds
user@switch# set sample-rate number

Restrictions

Flow monitoring can be configured in version 5, version 8, or version 9 export mode. Up to eight version 9 collectors are supported in export mode

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