QFX - ip helper - Requires explanation

Hi everybody,

I do understand why a lot of people would prefer working on Cisco. I need my client to boot from my PXE server on another subnet and I spent my day searching how to do it ... With a Catalyst, I did it in 30 seconds:

interface GigabitEthernet2/0.10
encapsulation dot1Q 10
ip address 192.168.1.250 255.255.255.0
ip helper-address 192.168.2.100
ip nat inside
!
interface GigabitEthernet2/0.20
encapsulation dot1Q 20
ip address 192.168.2.250 255.255.255.0
ip nat inside

With QFX ... ???

root> show version
fpc0:
--------------------------------------------------------------------------
Model: vqfx-10000

{master:0}[edit forwarding-options]
root# show
storm-control-profiles default {
all;
}
helpers {
tftp {
interface {
em0 {
server 192.168.2.100;
}
}
}
}

Regards,

Gueug