CoS rewrite rules: Rewrite MPLS and DSCP to different values

You can use this feature to independently rewrite MPLS EXP and IP DSCP code point values to different values within the same packet. This benefits you when your core network's CoS policies differ from those of an egress or neighboring network, ensuring each downstream device classifies packets correctly without compromise. The feature works by applying a rewrite rule that sets the MPLS EXP field according to a configured forwarding-class-based table, while simultaneously allowing the DSCP field to be set to a separate value. The goal is to carry the packet's CoS profile accurately across network boundaries, enabling consistent and appropriate service treatment at every hop.