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:

PVLAN Quick Notes

Private VLAN configuration: vlan 300 private-vlan primary private-vlan association 301-302 ! vlan 301 private-vlan isolated ! vlan 302 private-vlan community Port configuration: interface GigabitEthernet1/0/1 switchport private-vlan host-association 300 301 switchport mode private-vlan host What about the SVI? interface Vlan300 ip address private-vlan mapping ? WORD Secondary VLAN IDs of the private VLAN SVI interface mapping add Add a VLAN to private VLAN list remove Remove a VLAN from private VLAN list If we add a private-vlan mapping to the SVI it works like a promicuous port for all the secondary vlans mapped, reachable by both isolated and community ports: