Hello,
on a 2 nodes cluster in 4.1.6 I have this situation.
Every node has 3 bonds, each one composed by 2 network adapters and each one of type mode=4
(actually in setup networks I have configured custom and then the value: 
"mode=4 miimon=100"
)

At this moment only one of the servers has access to FC storage, while the other is currently on maintenance.

On 2 of the 3 bonds of the active server I get an exclamation point in "Network Interfaces" subtab with this mouseover popup

Bond is in link aggregation mode (mode 4), but no partner mac has been reported for it

What is the exact meaning of this message? Do I have to care about (I think so..)?
What should I report to network guys?
Eg, one of these two warning bonds status is:

# cat /proc/net/bonding/bond2
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

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

802.3ad info
LACP rate: slow
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: 48:df:37:0c:7f:5a
Active Aggregator Info:
        Aggregator ID: 5
        Number of ports: 2
        Actor Key: 9
        Partner Key: 6
        Partner Mac Address: b8:38:61:9c:75:80

Slave Interface: ens2f2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 2
Permanent HW addr: 48:df:37:0c:7f:5a
Slave queue ID: 0
Aggregator ID: 5
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 2
Partner Churned Count: 3
details actor lacp pdu:
    system priority: 65535
    system mac address: 48:df:37:0c:7f:5a
    port key: 9
    port priority: 255
    port number: 1
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: b8:38:61:9c:75:80
    oper key: 6
    port priority: 32768
    port number: 293
    port state: 61

Slave Interface: ens2f3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 2
Permanent HW addr: 48:df:37:0c:7f:5b
Slave queue ID: 0
Aggregator ID: 5
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 3
details actor lacp pdu:
    system priority: 65535
    system mac address: 48:df:37:0c:7f:5a
    port key: 9
    port priority: 255
    port number: 2
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: b8:38:61:9c:75:80
    oper key: 6
    port priority: 32768
    port number: 549
    port state: 61

Also, the other node (that is currently in maintenance) shows one of the 2 interfaces of bond2 (ens2f2) as down (red arrow) but on the host

# ip link show ens2f2
6: ens2f2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond2 state UP mode DEFAULT qlen 1000
    link/ether 48:df:37:0c:85:4e brd ff:ff:ff:ff:ff:ff
# 

Does this depend on the host being in maintenance? 
Perhaps when a host is in maintenance, the warnings on it are not checked/updated again from engine?

Thanks in advance,
Gianluca