[Bug 2052137] Re: bonded link goes down on reconfigure

[Nick Rosbrook]

I will look into this more when working on the next SRU for jammy. But
this is not a trivial backport because (a) the patch does not apply, and
(b) the link_down_now() function does not exist in v249 (was added in
v251). It might be fine to just use link_down(), but this all needs to
be tested when I have more time.

AFAICT, the patches should already be included in 24.04 since upstream
backported them to v255.4.

** Also affects: systemd (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: netplan.io (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu Jammy)
   Importance: Undecided => Low

** Changed in: systemd (Ubuntu Jammy)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

** Changed in: systemd (Ubuntu)
       Status: Triaged => Fix Released

** Tags removed: foundations-todo
** Tags added: systemd-sru-next

** Changed in: netplan.io (Ubuntu Jammy)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2052137

Title:
  bonded link goes down on reconfigure

Status in systemd:
  Fix Released
Status in netplan.io package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in netplan.io source package in Jammy:
  Invalid
Status in systemd source package in Jammy:
  New

Bug description:
  systemd-networkd brings down member interfaces of a bond when they get
  reconfigured

  Jan 31 15:43:46 unique-slug systemd-networkd[2430]: pn1: Bringing link
  down

  This has a result that a server has complete downtime for a few
  seconds, this has also been reported upstream
  https://github.com/systemd/systemd/issues/31165.

  A pull request has been opened to fix this
  https://github.com/systemd/systemd/pull/31172

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