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When to use mls qos vlan-based command?

When to use mls qos vlan-based command?


I am trying the understand what is the use of the command "mls qos vlan-based". Let's say I have the following configured:

interface Gi7/4
switchport access vlan 156
switchport mode access
no shut
interface Gi7/5
switchport access vlan 157
switchport mode access
no shut
interface Gi7/6
switchport access vlan 158
switchport mode access
no shut
interface Vlan156
service-policy input qos_lan

interface Vlan157
service-policy input qos_lan

interface Vlan158
service-policy input qos_lan

Is the following below required if I already applied the service policy to the SVI's:

interface range Gi7/4-6
mls qos vlan-based

Thank you

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