The dscp mutation map is a per-port configuration that permits to modify the dscp field of a packet. The mutation map works for EGRESS traffic only We trust the documentation but it’s event better to verify it. The topology si simple: PC1 –> G1/0/1 C3750-24 G1/0/24 –> G1/0/24 C3750-48 G1/0/1 –> PC2 running wireshark First step: turn on QOS on both switches with the command mls qos Then on C3750-24 port G1/0/1 we set COS to 5:

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Where the vNic meets the SDN

Network Engineer