Here is how you do it on the Aruba side. You can then configure the trunks on only the port channel:
!
interface gigabitethernet 1/1
description "GE1/1"
trusted
trusted vlan 1-4094
lacp group 2 mode active
!
interface gigabitethernet 1/2
description "GE1/2"
trusted
trusted vlan 1-4094
lacp group 2 mode active
!
interface gigabitethernet 1/3
description "GE1/3"
trusted
trusted vlan 1-4094
lacp group 2 mode active
!
interface port-channel 2
trusted
trusted vlan 1-4094
switchport mode trunk
switchport trunk native vlan 20
switchport trunk allowed vlan ......
Commands to verify LACP:
(SWF) #show lacp 2 neighbor
Flags: S - Device is requesting slow LACPDUs
F - Device is requesting fast LACPDUs
A - Device is in Active mode P - Device is in Passive mode
LACP Neighbor Table
-------------------
Port Flags Pri OperKey State Num Dev Id
---- ----- --- ------- ----- --- ------
GE 1/2 SA 32768 0x2 0x3d 0xc0 00:13:19:6A:4D:80
GE 1/3 SA 32768 0x2 0x3d 0xc2 00:13:19:6A:4D:80
GE 1/1 SA 32768 0x2 0x3d 0xc1 00:13:19:6A:4D:80
(SWF) #show lacp 2 counters
LACP Counter Table
------------------
Port LACPDUTx LACPDURx MrkrTx MrkrRx MrkrRspTx MrkrRspRx ErrPktRx
---- -------- -------- ------ ------ --------- --------- --------
GE 1/2 95 92 0 0 0 0 0
GE 1/3 96 90 0 0 0 0 0
GE 1/1 92 88 0 0 0 0 0
(SWF) #show lacp 2 internal
Flags: S - Device is requesting slow LACPDUs
F - Device is requesting fast LACPDUs
A - Device is in Active mode P - Device is in Passive mode
LACP Internal Table
-------------------
Port Flags Pri AdminKey OperKey State Num Status
---- ----- --- -------- ------- ----- --- ------
GE 1/2 SA 255 0x3 0x3 0x3d 0x3 up
GE 1/3 SA 255 0x3 0x3 0x3d 0x4 up
GE 1/1 SA 255 0x3 0x3 0x3d 0x2 up
(SWF) #show lacp sys-id
32768,00:0B:86:61:66:14
(SWF) #show interface port-channel 2
Port-Channel 2 is administratively up
Hardware is Port-Channel, address is 00:00:00:00:00:00 (bia 00:0B:86:61:66:17)
Description: Link Aggregate (LACP)
Spanning Tree is forwarding
VLAN membership: 1
Switchport priority: 0
Member port:
GE 1/2, Admin is up, line protocol is up
GE 1/3, Admin is up, line protocol is up
GE 1/1, Admin is up, line protocol is up
Last clearing of "show interface" counters 0 day 0 hr 52 min 54 sec
link status last changed 0 day 0 hr 21 min 27 sec
34355 packets input, 2882907 bytes
Received 10165 broadcasts, 0 runts, 0 giants, 0 throttles
456 input error bytes, 0 CRC, 0 frame
4811 multicast, 24190 unicast
17102 packets output, 1904307 bytes
0 output errors bytes, 0 deferred
0 collisions, 0 late collisions, 0 throttles
Port-Channel 2 is TRUSTED