When to use mls qos vlan-based command?

[drbk563]

Hi,

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
switchport access vlan 156
switchport mode access
no shut
!
interface Gi7/5
switchport
switchport access vlan 157
switchport mode access
no shut
!
interface Gi7/6
switchport
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