DHCP snooping is introduced to prevent ARP, IP, or DHCP packets with bogus IP and MAC addresses of other valid users from attacking DHCP servers and clients.
The OID of root objects is:
iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).huawei(2011).huaweiMgmt(5).hwDatacomm(25).hwDhcpSnpMib(112)