code: func (h *Handle) QdiscReplace(qdisc Qdisc) error {
  	return h.qdiscModify(
  		unix.RTM_NEWQDISC,
  		unix.NLM_F_CREATE|unix.NLM_F_REPLACE,
  		qdisc)
  }
docs: // QdiscReplace will replace a qdisc to the system.
  // Equivalent to: `tc qdisc replace $qdisc`
  // The handle MUST change.