> In the past it was okay to NOT have "optional: true" set for both: encc000 
> and encc000.2653 (and I found that logical, since both interfaces are needed 
> in a VLAN context).
> 
> Knowing now what's missing, I could live with that (even if it's a change in 
> behavior).

Interesting.. I suspect some infrastructure changes here. The default
for systemd-networkd-wait-online is to wait on the "degraded"
operational state, i.e. having a link-local address assigned to the
interface.

If there is SLAAC or IPv6 RA enabled on the other side of "encc000", the
interface might come online without "optional: true". But lacking such
setup, it would be stuck in the "configuring" state, as it waits for an
(IPv6) link-locaL address, putting it as "optional: true" helps in that
case with our recent changes.

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https://bugs.launchpad.net/bugs/2060311

Title:
  Setting "optional: true" to overcome he timeout "Job systemd-networkd-
  wait-online" does no longer work with latest noble image

Status in Netplan:
  In Progress
Status in Ubuntu on IBM z Systems:
  New
Status in netplan.io package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed
Status in netplan.io source package in Noble:
  Confirmed
Status in systemd source package in Noble:
  Confirmed

Bug description:
  Especially on s390x (but not limited to s390x) it's often the case that a 
system has network devices that are not necessarily connected during boot-up 
and one gets such a 2 min timeout:
  "Job systemd-networkd-wait-online. Start running (1min 59s / no limit)"

  In the past I could avoid that by setting "optional: true" post-install (no 
perfect, but worked),
  but this does no longer seem to work using the latest noble ISO image (Apr 
5th).

  Setting 'optional: true' in /etc/netplan/50-cloud-init.yaml looks like
  this for me:

  # This file is generated from information provided by the datasource.  Changes
  # to it will not persist across an instance reboot.  To disable cloud-init's
  # network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      ethernets:
          enP1p0s0:
              optional: true
              dhcp4: true
          enP1p0s0d1:
              optional: true
              dhcp4: true
          enP2p0s0:
              optional: true
              dhcp4: true
          enP2p0s0d1:
              optional: true
              dhcp4: true
          encc000: {}
      version: 2
      vlans:
          encc000.2653:
              addresses:
              - 10.11.12.15/24
              gateway4: 10.11.12.1
              id: 2653
              link: encc000
              nameservers:
                  addresses:
                  - 10.11.12.1

  ... can be set fine (also --dry-run does not moan, except about
  dhcp4).

  This worked in the past on noble, but also on older Ubuntu releases
  like jammy.

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