EX-2300 15.1X53-D56 DHCP snooping untrust on trunk

Hi Guys

I seems to have a big problem with configuring trunks as untrusted interfaces.

I can not find the way to override a default configuration of DHCP trust on trunk ports.

Can you please help.

show vlans VL-998 forwarding-options dhcp-security                                    
group UNTRUST {
    overrides {
        ##
        ## Warning: statement ignored: unsupported platform (ex2300-24p)
        ##
        untrusted;
    }
}