DHCP exclude-address on QFX5100

Hi

I need to replace my ex switch with QFX5100. All the DHCP configuration onEX switch is replicated to QFX5100. The only command i am unable to find in QFX is DHCP exclude-address command. Can anyone help. The EX command is as below.

set system services dhcp pool 10.121.71.128/25 exclude-address 10.121.71.232

Regards

Tayyab