[Bug 1880029] [NEW] Netplan optional-addresses produces Unknown key name 'OptionalAddresses'

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Łukasz Zemczak (sil2100):

Running on 20.04 (focal), the following netplan config for a bridge
interface, rendering with networkd:

network:
  version: 2
  bridges:
    br0:
      interfaces: [bond0, guest]
      dhcp4: on
      macaddress: aa:bb:cc:dd:db:2f
      optional-addresses: [ dhcp4 ]


Appears to apply cleanly, however under the hood, networkd appears to reject the resulting OptionalAddresses setting:

May 21 16:25:50 hyper systemd-networkd[864186]:
/run/systemd/network/10-netplan-br0.network:5: Unknown key name
'OptionalAddresses' in section 'Link', ignoring.

** Affects: netplan.io (Ubuntu)
     Importance: Medium
         Status: Triaged

** Affects: netplan.io (Ubuntu Kinetic)
     Importance: Medium
         Status: Triaged


** Tags: fr-2440
-- 
Netplan optional-addresses produces Unknown key name 'OptionalAddresses' 
https://bugs.launchpad.net/bugs/1880029
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