dhcp and option82 configuration

Hi there!

I faced a strange switch bahaviour and can not resolve this problem on my own.

So i have a switch : 

[HUAWEI]display version 

Huawei Versatile Routing Platform Software

VRP (R) software, Version 5.170 (S5335 V200R019C00SPC500)

Copyright (C) 2000-2019 HUAWEI TECH Co., Ltd.

HUAWEI S5335-L32ST4X-A Routing Switch uptime is 0 week, 0 day, 0 hour, 17 minutes

I was triyng to config  option82 and dhcp snooping :

 dhcp enable

#

dhcp snooping enable

#

dhcp option82 format user-defined "%svlan"

vlan 3000

 name internet

 igmp-snooping enable                     

 dhcp snooping enable                     

 dhcp snooping trusted interface GigabitEthernet0/0/32

 dhcp option82 insert enable interface GigabitEthernet 0/0/1 to 0/0/29

on every interface exapt uplink i entered :

interface GigabitEthernet0/0/30

#client

 port link-type access

 port default vlan 3000

 dhcp option82 insert enable

and on Uplink interface :

interface GigabitEthernet0/0/32

 port link-type trunk

 port trunk allow-pass vlan 2 200 3000

 dhcp snooping trusted

But after i entered  

[HUAWEI-vlan3000]dhcp option82 encapsulation vendor-specific-id 

username  turn to 

demux0.1073751698   100.64.225.120                          00040FA00114:010D534D464C2D30342D4443535739

And  the strange thing is, I deleted all dhcp / option82 configuration, rebooted switch 

<HUAWEI>display dhcp option82 configuration 

<HUAWEI>

<HUAWEI>display dhcp snooping configuration 

<HUAWEI>

<HUAWEI>disp dhcp snooping 

DHCP snooping global running information :

 DHCP snooping                            : Disable  (default)

But !  DHCP snooping works , i receive an IP address  and i have no idea what to do with it