L2 QoS lab with DSCP mutation map and QoS port statistics

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: