It turns out that if STP is enabled, then one cannot disable the forward
delay, and a value < 2 is not compatible with STP.
If I set stp: false in netplan, then we get:
# cat /run/systemd/network/10-netplan-br0.netdev
[NetDev]
Name=br0
Kind=bridge
[Bridge]
AgeingTimeSec=250
Priority=22
ForwardDelaySec=1
HelloTimeSec=1
MaxAgeSec=10
STP=false
which results in a proper value in brctl and sysfs matching. (1.00/100
respectively)
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1721156
Title:
networkd does not set bridge forward delay value correctly
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