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https://www.juniper.net/us/en/local/pdf/app-notes/3500204-en.pdf

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