** Changed in: systemd (Ubuntu Cosmic)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1826387

Title:
  systemd-networkd restart brings down bond slaves

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  Won't Fix

Bug description:
  Reported upstream as https://github.com/systemd/systemd/issues/10118

  Ubuntu bionic, systemd version 237-3ubuntu10.19

  When systemd-networkd is used to manage network bonds, upon systemd-
  networkd, bonds are brought down for ~10 seconds affecting
  connectivity to the server. From networkd logs (truncated to:

  ```
  # journalctl -b -u systemd-networkd | grep enp3s0f
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: Ignoring 
/etc/systemd/network/01-enp3s0f1.network, because it's not a regular file with 
suffix .netdev.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: Ignoring 
/etc/systemd/network/00-enp3s0f0.network, because it's not a regular file with 
suffix .netdev.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: 
+SLAVE +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link 6 added
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: udev initialized 
link
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Saved original 
MTU: 9000
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: 
+SLAVE +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link 3 added
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: udev initialized 
link
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Saved original 
MTU: 9000
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link state is 
up-to-date
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: found matching 
network '/etc/systemd/network/01-enp3s0f1.network'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not 
managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Started LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Enslaving by 
'bond0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Link 'enp3s0f1' was 
up when attempting to enslave it. Bringing link down.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Bringing link 
down
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Enslaving link 
'enp3s0f1'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link state is 
up-to-date
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: found matching 
network '/etc/systemd/network/00-enp3s0f0.network'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link does not 
request DHCPv6 prefix delegation
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Started LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Enslaving by 
'bond0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Link 'enp3s0f0' was 
up when attempting to enslave it. Bringing link down.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Bringing link 
down
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Enslaving link 
'enp3s0f0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: 
-UP -LOWER_UP -RUNNING
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Stopped LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Lost carrier
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: State is 
configuring, dropping config
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Joined netdev
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Bringing link up
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: IPv6 
successfully enabled
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: 
-UP -LOWER_UP -RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Stopped LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Lost carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: State is 
configuring, dropping config
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Joined netdev
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Bringing link up
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: IPv6 
successfully enabled
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: +UP
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f1: Started LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: 
+UP +RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Started LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Gained carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: 
-RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Lost carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: State is 
configuring, dropping config
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: 
+LOWER_UP +RUNNING
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f0: Gained carrier
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: 
+LOWER_UP +RUNNING
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f1: Gained carrier
  ```

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