Follow these steps to apply an MPLS QoS EXP-to-DSCP mutation map globally.
device# configure terminal
device(config)# qos-mpls map-apply exp-dscp expDscpMap all
device(exp-dscp-expDscpMap)# end
device# show qos-mpls maps exp-dscp 
exp-dscp map 'expDscpMap'
    Exp   : 0  1  2  3  4  5  6  7
   ------- ------------------------
    DSCP  : 0  2  4  3  6  4  5  7
   Enabled on the following slots:
      ALL
 
		  device# copy running-config startup-config
device# configure terminal device(config)# qos-mpls map-apply exp-dscp expDscpMap all device(config)# end device# show qos-mpls maps exp-dscp device# copy running-config startup-config