Connection set-up:


Traffic Gen (1GE interface) ----> Switch -----> (10GE xenpax/ ge-0/1/0) JT640 (10GE xenpax/ ge-0/0/0) ----> Switch ----> Traffic Gen

Note: 

TG (Traffic Gen) available interface is 1GE only.
JT640 available interface is 10GE xenpak only.
We used policer (limit to 100mb) in incoming interface (ge-0/1/0) to be able to simulate congestion.



configuration snippet...


interfaces {
    ge-0/0/0 {
        unit 0 {
            family inet {
                address 10.10.10.1/24;
            }
        }
    }
    ge-0/1/0 {
        unit 0 {
            family inet {
                filter {
                    input classify-traffic-1;
                }
                policer {
                    input limit-to-100M;
                }
                address 20.20.20.1/24;
            }
        }
    }
   

class-of-service {
    drop-profiles {
        high-drop-me {
            interpolate {
                fill-level [ 25 50 ];
                drop-probability [ 50 90 ];
            }
        }
        low-drop-me {
            interpolate {
                fill-level [ 10 100 ];
                drop-probability 0;
            }
        }
        medium-drop {
            interpolate {
                fill-level [ 25 70 ];
                drop-probability [ 30 50 ];
            }
        }
        test-drop {
            fill-level 100 drop-probability 100;
        }
    }
    forwarding-classes {
        queue 0 Silver;
        queue 1 Gold;
        queue 2 Platinum;
        queue 3 NC;
    }
    interfaces {
        ge-0/0/0 {
            scheduler-map PLDT-COS-MAP;
         }
    }
      scheduler-maps {
        PLDT-COS-MAP {
            forwarding-class Platinum scheduler Platinum-scheduler;
            forwarding-class Gold scheduler Gold-scheduler;
            forwarding-class Silver scheduler Silver-scheduler;
            forwarding-class NC scheduler NC-scheduler;
        }
    }
    schedulers {
        Platinum-scheduler {
            transmit-rate 50m;
            buffer-size percent 90;
            priority high;
            drop-profile-map loss-priority low protocol any drop-profile low-drop-me;
            drop-profile-map loss-priority high protocol any drop-profile high-drop-me;
        }
        Gold-scheduler {
            transmit-rate 50m;
            buffer-size percent 5;
            priority low;
            drop-profile-map loss-priority low protocol any drop-profile low-drop-me;
            drop-profile-map loss-priority high protocol any drop-profile high-drop-me;
        }
        Silver-scheduler {
            transmit-rate 50m;
            buffer-size percent 3;
            priority low;
            drop-profile-map loss-priority high protocol any drop-profile high-drop-me;
        }
        NC-scheduler {
            transmit-rate 10m;
            buffer-size percent 2;
            priority low;
        }
    }
}
firewall {
    policer limit-to-100M {
        if-exceeding {
            bandwidth-limit 100m;
            burst-size-limit 512k;
        }
        then discard;
    }
    filter classify-traffic-1 {
        term silver-pack {
            from {
                destination-address {
                    10.10.10.4/32;
                }
            }
            then {
                forwarding-class Silver;
                next term;
            }
        }
        term gold-pack {
            from {
                destination-address {
                    10.10.10.3/32;
                }
            }
            then {
                loss-priority high;
                forwarding-class Gold;
                accept;
            }
        }
        term platinum-pack {
            from {
                destination-address {
                    10.10.10.2/32;
                }
            }
            then {
                loss-priority low;
                forwarding-class Platinum;
                accept;
            }
        }
        term is-voice {
            from {
                port 5060-5061;
            }
            then {
                loss-priority low;
                accept;
            }
        }
        term is-video {
            from {
                port 10001;
            }
            then {
                loss-priority high;
                accept;
            }
        }
        term NC-traffic {
            from {
                port 22;
            }
            then {
                loss-priority low;
                forwarding-class NC;
                accept;
            }
        }
        term accept-all {
            then {
                loss-priority high;
                accept;
            }
        }
    }
}

[edit]
nera@JT640#