Interfaces up but trunk down

Hi all,

We've VIPRION C2400 with 1 blade installed, connecting to Nexus N5K switches. There are 3 LACP trunks with 2 interfaces each, formed and have been running over year, running 12.0.0.

Recently 2 more blades added to the VIPRION, each contributes 3 interfaces to the 3 LACP trunks. There is no problem in adding the interface. The VIPRION is not rebooted since adding new interface to the 3 trunks.

Today we reboot the VIPRION, then when the system is started, all 3 trunks are marked down, while the member interfaces are up. Double checked with our Network support and found that although the Port Channel on switch side is connected, but the newly added interfaces are suspended since being added.

We tried some actions but all in vain:

1. remove the newly added interfaces and restart the system

2. change production LACP mode from Active to Passive (according to https://support.f5.com/csp/article/K13142).

Since the Port Channel status on switch is connected, there is nothing can do on switch side. Here is the interface status:

--------------------------------------------------------------------------------
Port          Name               Status    Vlan      Duplex  Speed   Type
--------------------------------------------------------------------------------
Eth1/2        po1                connected trunk     full    10G     1/10g          (existing)
Eth1/3        po1                connected trunk     full    10G     1/10g          (existing)
Eth1/12       po1                suspnd    trunk     full    10G     1/10g          (new) 
Eth1/13       po1                suspnd    trunk     full    10G     1/10g          (new)

Po1           viprion_ha         connected trunk     full    10G     

There is also some error in /var/log/ltm, e.g.

Jun  8 16:24:08 slot2/viprion1 notice sod[5410]: 010c0048:5: Bcm56xxd and lacpd connected - links up.
Jun  8 16:24:10 slot2/viprion1 err bcm56xxd[6953]: 012c0010:3: Trouble with packet send request from LACPD oort 9
Jun  8 16:24:10 slot2/viprion1 err bcm56xxd[6953]: 012c0010:3: Trouble with packet send request from LACPD oort 11
Jun  8 16:24:12 slot2/viprion1 err bcm56xxd[6953]: 012c0010:3: Trouble with packet send request from LACPD oort 10
Jun  8 16:24:42 slot3/viprion1 info lacpd[6220]: 01160012:6: Link 3/1.3 Partner Out of Sync
Jun  8 16:24:42 slot1/viprion1 info lacpd[6102]: 01160012:6: Resuming log processing at this invocation; hels.
Jun  8 16:24:42 slot1/viprion1 info lacpd[6102]: 01160012:6: Link 1/1.11 Partner Out of Sync
Jun  8 16:24:42 slot1/viprion1 info lacpd[6102]: 01160012:6: Link 1/1.15 Partner Out of Sync
Jun  8 16:24:58 slot2/viprion1 info lacpd[7495]: 01160012:6: Link 2/1.1 Partner Out of Sync
Jun  8 16:24:58 slot2/viprion1 info lacpd[7495]: 01160012:6: Link 2/1.3 Partner Out of Sync
Jun  8 16:24:58 slot2/viprion1 info lacpd[7495]: 01160012:6: Link 2/1.2 Partner Out of Sync

We've no idea at all. Would anyone please help?

Thanks a lot.

Rgds