juniper@R2> ping 12.1.1.1 rapid size 1600       
PING 12.1.1.1 (12.1.1.1): 1600 data bytes
!!!!!
--- 12.1.1.1 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 5.131/6.676/8.870/1.246 ms

juniper@R2>