To set the initial value of the EXP bits to the
UPC value associated with the packets:
Issue the mpls copy-upc-to-exp command.
host1(config)#mpls copy-upc-to-exp
To prevent the value of the EXP bits for
a VPN/VC label from being modified by a per-LSP policy applied for
the outer labels or by per-VR traffic class/color rules: