Note that the mutation gets applied to all ports supported by the same ASIC

S5#sh run | b mls
mls qos map dscp-mutation Prob9 14 to 12
mls qos map dscp-mutation Prob9 28 to 26
mls qos
!
interface FastEthernet0/12
 switchport mode dynamic desirable
!
interface FastEthernet0/13
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/14
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/15
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/16
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/17
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/18
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/19
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/20
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/21
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/22
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/23
 switchport mode dynamic desirable
 mls qos dscp-mutation Prob9
!
interface FastEthernet0/24
 switchport trunk encapsulation dot1q
 switchport mode trunk
 mls qos trust dscp
 mls qos dscp-mutation Prob9
!