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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

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/services-version-9-flow-template-flow-aggregation-configuring.html

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