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.

[edit firewall family family-name]

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.

Another option is to configure the direction of traffic to be sampled by including the sampling statement at the [edit interfaces interface-name unit logical-unit-number family inet] hierarchy level, specifying input, output, or both.

[edit interfaces interface-name unit logical-unit-number family inet]

sampling {

    input;

    output;

}

• 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:

[edit interfaces interface-name unit logical-unit-number family family-name]

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:

[edit forwarding-options]

sampling {

    input {

        family inet{

            max-packets-per-second number;

            rate number;

        }

    }

}