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;

  }

  }

  }