Use the do show red profiles command to view the RED profile's configuration.
SLX(conf-if-eth-0/1)# do show qos red profiles 1
Red Profile 1
        Minimum Threshold: 10
        Maximum Threshold: 50
        Drop Probability: 100
        ECN: Off              
    Activated on the following interfaces:
        Eth 0/1  traffic-class: 0 drop-precedence: 03
        
        Similarly, use the show qos red statistics command to view the per port RED dropped packets.
SLX# show qos red statistics interface eth 0/1
Statistics for interface: Eth 0/1
        Port Statistics:
                Packets Dropped: 147, Queue Full Drops: 222, ECN Marked: 234