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My questions is,Does the above command means that I can send traffic with a max rate of 1Mbps since I set excess burst as 192KB ?
No, in actual fact your data transmission rate is always physical interface "speed".
What the policer will do, if you try to send a volume of data, during the measured time period (Tc), that exceeds what would be transmitted by the measured rate, the excess will be dropped.
PS:
BTW, Be often just seems to effectively create a larger Bc.