> 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

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