I've added "mtu: 9000" to the bonds section, which now reads as follows;
bonds:
eth1:
mtu: 9000
interfaces:
- enp5s0f0
- enp5s0f1
- enp6s0f0
- enp6s0f1
parameters:
down-delay: 0
lacp-rate: fast
mii-monitor-interval: 100
mode: 802.3ad
transmit-hash-policy: encap3+4
up-delay: 0
I re-ran netplan apply, but the bond had the same MTU as before. I also
tried restarting systemd-networkd as I could see that the relevant
.netdev files in /run/systemd/network/ had MTUBytes set to 9000.
However, the interface remained at 1500 bytes.
After a system restart however, the bond interface is now running at a
MTU of 9000. dmesg now only has messages for the member interfaces being
increased from 1500 to 9000 MTU - the messages regarding the MTU being
lowered from 9000 to 1500 when the bond was being configured are no
longer present.
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https://bugs.launchpad.net/bugs/1774666
Title:
Bond interfaces stuck at 1500 MTU on Bionic
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