vrrp and dhcp relay create duplicate pacquet

[TPG-GVA]

Hi,

Just detected an issues on our DHCP servers with network behind a VRRP gateway.

Both switches in the vrrp group forward the DHCPDISCOVER paquet to our DHCP Servers.

I know the configuration on Cisco devices (http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-12-4t-book/iap-udp-vrg.html#GUID-4CF30C18-173E-4F30-AF6E-A12480398386), but couldn't find any documentation on hp devices (Model: 5900AF-48XG-4QSFP w/ firmware: 7.1.045, Release 2422P01).

Using dhcp relay statistics interface Vlan-interface XX, I can see that both switches are relaying the pacquet

vrrp and vlan interface configuration are as below:

dis vrrp int vlan 62
IPv4 Virtual Router Information:
Running mode : Standard
Total number of virtual routers on interface Vlan-interfacexx : 1
Interface VRID State Running Adver Auth Virtual
Pri Timer Type IP
---------------------------------------------------------------------
VlanXX 62 Master 224 100 None 10.20.62.1

dis cur int vlan xx
#
interface Vlan-interfacexx
description Clients VDI Conseil Administration
ip address 10.20.62.3 255.255.255.0
vrrp vrid xx virtual-ip 10.20.62.1
vrrp vrid 62 priority 224
vrrp vrid 62 preempt-mode delay 180
dhcp select relay
dhcp relay server-address 10.1.10.244
dhcp relay server-address 10.1.10.200

Can anyone tell me which feature to enable on top of vrrp to resolve those duplicate paquet ?

Thanks & Best Regards.

Jean-Christophe