"Bad" Configuration for active-backup mode:
--------------------------------------------------------

----
$ cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
  
Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: enp94s0f1d1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Peer Notification Delay (ms): 0

Slave Interface: enp94s0f1d1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 2
Permanent HW addr: 4c:d9:8f:48:08:da
Slave queue ID: 0

Slave Interface: enp94s0f0
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 2
Permanent HW addr: 4c:d9:8f:48:08:d9
Slave queue ID: 0

---
$ cat uname-rv 
5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020

---
Scrubbed /etc/netplan/50-cloud-init.yaml:
network:
    bonds:
        bond0:
            addresses:
            - 0.0.235.177/25
            gateway4: 0.0.235.129
            interfaces:
            - enp94s0f0
            - enp94s0f1d1
            macaddress: 00:00:00:48:08:00
            mtu: 9000
            nameservers:
                addresses:
                - 0.0.235.171
                - 0.0.235.172
                search:
                - maas
            parameters:
                down-delay: 0
                gratuitious-arp: 1
                mii-monitor-interval: 100
                mode: active-backup
                transmit-hash-policy: layer2
                up-delay: 0
    ethernets:
        eno1:
            match:
                macaddress: 00:00:00:76:6e:ca
            mtu: 1500
            set-name: eno1
        eno2:
            match:
                macaddress: 00:00:00:76:6e:cb
            mtu: 1500
            set-name: eno2
        enp94s0f0:
            match:
                macaddress: 00:00:00:48:08:00
            mtu: 9000
            set-name: enp94s0f0
        enp94s0f1d1:
            match:
                macaddress: 00:00:00:48:08:da
            mtu: 9000
            set-name: enp94s0f1d1
    version: 2

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https://bugs.launchpad.net/bugs/1853638

Title:
  BCM57416 NetXtreme-E Dual-Media 10G RDMA Ethernet device seems to be
  dropping data

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