packet-generator new {
  name x
  limit 1
  node ip4-input
  size 64-64
  no-recycle
  data {
    ICMP: 1.0.0.2 -> 232.1.1.1
    ICMP echo_request
    incrementing 100
  }
}

trace add pg-input 100
loop create
loop create
set int state loop0 up
set int state loop1 up

ip mroute add 232.1.1.1 via pg0 Accept
ip mroute add 232.1.1.1 via loop0 Forward
ip mroute add 232.1.1.1 via loop1 Forward