Looks like this has been fixed in upstream systemd, so there's probably not a lot that we can do on the Netplan side.
** Changed in: netplan.io (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. 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: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/2052137/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp