[Bug 1774666] Re: Bond interfaces stuck at 1500 MTU on Bionic

[Andres Rodriguez]

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

** Also affects: cloud-init
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1774666

Title:
  Bond interfaces stuck at 1500 MTU on Bionic

Status in cloud-init:
  New
Status in MAAS:
  Incomplete
Status in cloud-init package in Ubuntu:
  New
Status in netplan.io package in Ubuntu:
  New

Bug description:
  When deploying a machine through MAAS with bonded network interfaces,
  the bond does not have a 9000 byte MTU applied despite the attached
  VLANs having had a 9000 MTU explicitly set. The MTU size is set on the
  bond members, but not on the bond itself in Netplan. Consequently,
  when the bond is brought up, the interface MTU is decreased from 9000
  to 1500. Manually changing the interface MTU after boot is successful.

  This is not observed when deploying Xenial on the same machine. The
  bond comes up at the expected 9000 byte MTU.

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