Thanks Jon. I have a switch between R2 and R3. My scenario looks like this
R1 --> R2 --> SW1 --> R3.
Therefore, I would need to do an 'mls qos trust dscp' on the interface coming to SW1 only right to preserve its DSCP marking ? Don't think I need to do an 'mls qos trust dscp' for the outbound traffic to R3 right ?
Personally I believe, network devices shouldn't be rewriting parts of a frame/packet unless they have to or have been explicitly configured to do so. However, as Jon notes, some network devices can do so, such as some Cisco switches with QoS support "enabled" in their "default" configuration. (Cisco, I guess, could argue enabling QoS support is enough of an "explict" configuration.)
Anyway, you really should carefully review device operation for the devices along the path so there are no unpleasant "surprises". Besides the option Jon mentions of trusting DSCP, some devices now offer a "no mls qos rewrite ip dscp" command.
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