Can I use A5120-24G with 1Giga IRF link to do a LACP via two member?

[nnnnnnine]

Hi Everyone,

We have two HP A5120-24G SI (version 5.20, Release 1505P09)

This two A5120 config IRF link:

#
irf-port 1/1
 port group interface GigabitEthernet1/0/21 mode normal
#
irf-port 1/2
 port group interface GigabitEthernet1/0/22 mode normal
#
irf-port 2/1
 port group interface GigabitEthernet2/0/21 mode normal
#
irf-port 2/2
 port group interface GigabitEthernet2/0/22 mode normal
#

and now we  connect a Server (CentOS 6.4) with two nic (eth0 & eth1)

eth0 connect to GigabitEthernet1/0/3

eth1 connect to GigabitEthernet2/0/3

and AT server side we create a bond0 device.

config like this:

cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
ONBOOT=yes

cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
ONBOOT=yes

cat /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=10.33.74.115
NETMASK=255.255.255.0
ONBOOT=yes
BOOTPROTO=static
BONDING_OPTS="mode=4 miimon=50"

cat /proc/net/bonding/bond0 | grep Mode
Bonding Mode: IEEE 802.3ad Dynamic link aggregation

Then we config LACP at A5120 SI with IRF stack.

Create Layer 2 aggregate interface Bridge-Aggregation 1.
interface bridge-aggregation 1
[A-Bridge-Aggregation1] link-aggregation mode dynamic
[DeviceA-Bridge-Aggregation1] quit

[A] interface gigabitethernet 1/0/3
[A-GigabitEthernet1/0/3] port link-aggregation group 1
[A-GigabitEthernet1/0/3] quit
[A] interface gigabitethernet 2/0/3
[A-GigabitEthernet2/0/3] port link-aggregation group 1
[A-GigabitEthernet2/0/3] quit

After config switch and server,

at server side, I use command (ip -s link show) to monitor eth0 & eth1 link status.

but all traffic only via eth0.

So my question is :

Is A5120 SI support LACP two port 

GigabitEthernet1/0/3

GigabitEthernet2/0/3

OR

It's only support LACP two port in same device

GigabitEthernet1/0/3

GigabitEthernet1/0/4

Thansk for you time,

any help is welcome.