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

[Matt LaPlante]

Public bug reported:

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: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1880029

Title:
  Netplan optional-addresses produces Unknown key name
  'OptionalAddresses'

Status in netplan.io package in Ubuntu:
  New

Bug description:
  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.

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