Hi, my teacher gave me the task to create a MPLS VPN network. I have successfully done everything he asked for, except for the QoS configuration. Since I'm a beginner I'm not familiar with QoS whatsoever. I have been trying to figure out how to do it for the past couple of days but I can't seem to figure it out so I'd be very glad if someone here could help me out. I'm supposed to configure QoS on both PE and CE routers. The QoS needs to have 3 classes - Real Time, Default and Data. I need to make it so that the CE router switches the DSCP values to EXP values for the PE router, and the other way around for PE - it needs to switch from EXP values to DSCP for the CE router. The topology is as shown below. Any instructions will be appreciated. Thanks in advance! 