def METHOD_NAME(name, mac, mtu=1500):
    """
    Add a new nictag
    name : string
        name of new nictag
    mac : string
        mac of parent interface or 'etherstub' to create a ether stub
    mtu : int
        MTU (ignored for etherstubs)
    CLI Example:
    .. code-block:: bash
        salt '*' nictagadm.add storage0 etherstub
        salt '*' nictagadm.add trunk0 'DE:AD:OO:OO:BE:EF' 9000
    """
    ret = {}
    if mtu > 9000 or mtu < 1500:
        return {"Error": "mtu must be a value between 1500 and 9000."}
    if mac != "etherstub":
        cmd = "dladm show-phys -m -p -o address"
        res = __salt__["cmd.run_all"](cmd)
        # dladm prints '00' as '0', so account for that.
        if mac.replace("00", "0") not in res["stdout"].splitlines():
            return {"Error": "{} is not present on this system.".format(mac)}
    if mac == "etherstub":
        cmd = "nictagadm add -l {}".format(name)
        res = __salt__["cmd.run_all"](cmd)
    else:
        cmd = "nictagadm add -p mtu={},mac={} {}".format(mtu, mac, name)
        res = __salt__["cmd.run_all"](cmd)
    if res["retcode"] == 0:
        return True
    else:
        return {
            "Error": "failed to create nictag."
            if "stderr" not in res and res["stderr"] == ""
            else res["stderr"]
        }