Comment 26 for bug 1853638

Good System/Good NIC (all configurations work) Comparison
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NIC: NetXtreme II BCM57000 10 Gigabit Ethernet QLogic 57000
System: Dell
Kernel: 5.0.0-25-generic #26~18.04.1-Ubuntu

/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: enp5s0f1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: enp5s0f1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:00:00:00:73:e2
Slave queue ID: 0

Slave Interface: enp5s0f0
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:00:00:00:73:e0
Slave queue ID: 0

/etc/netplan/50-cloud-init.yaml
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network:
    bonds:
        bond0:
            addresses:
            - 00.00.235.182/25
            gateway4: 00.00.235.129
            interfaces:
            - enp5s0f0
            - enp5s0f1
            macaddress: 00:00:00:00:73:e0
            mtu: 9000
            nameservers:
                addresses:
                - 00.00.235.172
                - 00.00.235.171
                search:
                - maas
            parameters:
                down-delay: 0
                gratuitious-arp: 1
                mii-monitor-interval: 100
                mode: active-backup
                transmit-hash-policy: layer2
                up-delay: 0
    ethernets:
        ...(snip)..
        enp5s0f0:
            match:
                macaddress: 00:00:00:00:73:e0
            mtu: 9000
            set-name: enp5s0f0
        enp5s0f1:
            match:
                macaddress: 00:00:00:00:73:e2
            mtu: 9000
            set-name: enp5s0f1
    version: 2