The LACP of the two interfaces is not stable. Ping falls to 20%

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The LACP of the two interfaces is not stable.
Ping falls to 20%

Hello,
I am trying to connect RHEL 7.6 to Switch Juniper EX4300 in LACP mode, I mean bond mode = 4 / 802.3ad.
The switch has the following configuration:

show configuration interfaces ae10 
description DESC;
aggregated-ether-options {
    lacp {
        active;
        periodic slow;
    }
}
unit 0 {
    family ethernet-switching {
        interface-mode trunk;
        vlan {
            members [ OOB_MGNT_DCE_RHEW OOB_MGNT_DCE_Monitoring OOB_MGNT_DCE_HW ];
        }
    }
}

On the server side, this configuration:

# cat /etc/sysconfig/network-scripts/ifcfg-bond0_slave_1
HWADDR=AA:BB:CC:DD:EE:FF
TYPE=Ethernet
NAME="bond0 slave 1"
#UUID=488e980b-2145-4b37-a151-15be8cf2dee0
DEVICE=ens3f0
ONBOOT=yes
MASTER=bond0
SLAVE=yes
ZONE=public
UUID=1c4a0d15-e00d-a2fa-60ef-a83a0f504e79

# cat /etc/sysconfig/network-scripts/ifcfg-bond0_slave_2
HWADDR=00:11:22:33:44:55
TYPE=Ethernet
NAME="bond0 slave 2"
#UUID=504f0fb2-211e-4b38-8fe6-24a7b63dc1ef
DEVICE=ens3f1
ONBOOT=yes
MASTER=bond0
SLAVE=yes
ZONE=public
UUID=9df58229-b454-00ec-03ba-78099296b37f

# cat /etc/sysconfig/network-scripts/ifcfg-bond0
# Generated by VDSM version 4.30.17.1.git0de043f
DEVICE=bond0
BONDING_OPTS="downdelay=0 lacp_rate=fast miimon=1 mode=802.3ad updelay=0"
MACADDR=AA:BB:CC:DD:EE:FF
ONBOOT=yes
MTU=1500
DEFROUTE=no
IPV6INIT=no
TYPE=Bond
BONDING_MASTER=yes
PROXY_METHOD=none
BROWSER_ONLY=no
NAME="Bond bond0"
UUID=ad33d8b0-1f7b-cab9-9447-ba07f855b143

# cat /etc/sysconfig/network-scripts/ifcfg-bond0.343
# Generated by VDSM version 4.30.17.1.git0de043f
DEVICE=bond0.343
VLAN=yes
BRIDGE=ovirtmgmt
ONBOOT=yes
MTU=1500
DEFROUTE=no
NM_CONTROLLED=yes
TYPE=Vlan
PHYSDEV=bond0
VLAN_ID=343
REORDER_HDR=yes
GVRP=no
MVRP=no
NAME="Vlan bond0.343"
UUID=183cec78-9fe0-8701-58de-59bc537df364

# cat /etc/sysconfig/network-scripts/ifcfg-ovirtmgmt
# Generated by VDSM version 4.30.17.1.git0de043f
DEVICE=ovirtmgmt
TYPE=Bridge
STP=no
ONBOOT=yes
IPADDR=10.x.x.19
NETMASK=255.255.255.192
GATEWAY=10.x.x.1
BOOTPROTO=none
MTU=1500
DEFROUTE=yes
NM_CONTROLLED=yes
IPV6INIT=no
DNS1=10.x.x.11
PROXY_METHOD=none
BROWSER_ONLY=no
PREFIX=26
IPV4_FAILURE_FATAL=no
NAME="Bridge ovirtmgmt"
UUID=9a0b07c0-2983-fe97-ec7f-ad2b51c3a3f0

Bond looks healthy, but ping responses have about 20% loss.

# cat /proc/net/bonding/bond0
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): 1
Up Delay (ms): 0
Down Delay (ms): 0

802.3ad info
LACP rate: fast
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: aa:bb:cc:dd:ee:ff
Active Aggregator Info:
        Aggregator ID: 20
        Number of ports: 2
        Actor Key: 9
        Partner Key: 11
        Partner Mac Address: aa:aa:aa:aa:aa:aa

Slave Interface: ens3f0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 1
Permanent HW addr: aa:bb:cc:dd:ee:ff
Slave queue ID: 0
Aggregator ID: 20
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: aa:bb:cc:dd:ee:ff
    port key: 9
    port priority: 255
    port number: 1
    port state: 63
details partner lacp pdu:
    system priority: 127
    system mac address: aa:aa:aa:aa:aa:aa
    oper key: 11
    port priority: 127
    port number: 22
    port state: 63

Slave Interface: ens3f1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:11:22:33:44:55
Slave queue ID: 0
Aggregator ID: 20
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: aa:bb:cc:dd:ee:ff
    port key: 9
    port priority: 255
    port number: 2
    port state: 63
details partner lacp pdu:
    system priority: 127
    system mac address: aa:aa:aa:aa:aa:aa
    oper key: 11
    port priority: 127
    port number: 23
    port state: 63

I thought by default it would work without the need to try different bonding parameters.
Please help find the mistake.

Thank you and best regards Jiří Kameník

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