Minimum Traffic Sampling or Forwarding Configuration

To configure traffic sampling on a logical interface, 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. filter filter-name { term term-name { then { sample; accept; } } }

For more information about firewall filter actions and action modifiers, see the JUNOS Policy Framework Configuration Guide.

Apply the filter to the interfaces on which you want to sample traffic by including the address and filter statements at the [edit interfaces interface-name unit logical-unit-number family family-name] hierarchy level: address address { destination destination-address; } filter { input filter-name; }
Enable sampling and specify a nonzero sampling rate by including the sampling statement at the [edit forwarding-options] hierarchy level:sampling { input { family inet { max-packets-per-second number; rate number; } } }