Minimum Traffic Sampling or Forwarding Configuration

To configure traffic sampling, you must perform at least the following tasks:

Create a firewall filter to apply to the logical interfaces being sampled by including the filter statement at the [edit firewall family family-name] hierarchy level. In the filter then statement, you must specify the action modifier sample and the action accept. [edit firewall family] filter filter-name { term term-name { then { sample; accept; } } }
Apply the filter to the interfaces on which you want to sample traffic: [edit interfaces] interface-name { unit logical-unit-number { family family-name { filter { input filter-name; } address address { destination destination-address; } } } }
Enable sampling and specify a nonzero sampling rate:[edit forwarding-options] sampling { input { family inet { rate number; } } }