The method used to set the high 6 bits of the IPv4 TOS or IPv6 Traffic Class in the outer IP header. A value of -1 indicates that the bits are copied from the payload's header. A value of -2 indicates that a traffic conditioner is invoked and more information may be available in a traffic conditioner MIB. A value between 0 and 63 inclusive indicates that the bit field is set to the indicated value.