No LACP on 2x10G bond with Cisco 3850

[Vladimir]

Having issue with R80.10 GW (ClusterXL members), on 13500 units (non-VSX):

LACP issue with Cisco 3850. Bond consisting of two 10G interfaces (same card on 13500s), show  Load Sharing being "Down" (bond1):

[Expert@CICNYCP1:0]# cphaconf show_bond -a

|Slaves |Slaves |Slaves
Bond name |Mode                |State       |configured    |in use |required
-----------+-------------------+------+-----------+-------+--------
bond1          | Load Sharing |  DOWN   | 2                  | 2         | 1
bond2          | Load Sharing |      UP     | 2                  | 2          | 1

[Expert@CICNYCP1:0]# cat /proc/net/bonding/bond1
Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2 (0)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 200
Down Delay (ms): 200

802.3ad info
LACP rate: slow
Active Aggregator Info:
Aggregator ID: 2
Number of ports: 1
Actor Key: 33
Partner Key: 1
Partner Mac Address: 00:00:00:00:00:00

Slave Interface: eth2-02
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:1c:7f:62:4c:8f
Aggregator ID: 1

Slave Interface: eth2-01
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:1c:7f:62:4c:8e
Aggregator ID: 2
-----------------------------------------

While Cisco claims it is up:

# show etherchannel 1 summary

Number of channel-groups in use: 1
Number of aggregators: 1

...

Group     Port-channel   Protocol   Ports
------------+-----------------+-----------+-----------------------------------------------
2             Po2(SU)         LACP       Te1/0/1(P) Te2/0/1(P)

The bond2, same configuration on different card's 2x10G, connected to Nexus switch, actually works fine.

FYI: the data shown above is a doctored sample, I do not presently have access to the systems, but am fairly sure I am reproducing it accurately. Will update this question with live data next week.

If any of you have bumped into this one before, please share the solution or troubleshooting methods.