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[Tytus <tytus.kurek@xxxxxxxxxxxxx>]

Public bug reported:

High level description:

I am unable to influence MTU of br-tun using Neutron configuration
settings. I am following instructions provided at the following website
(Case 1):

http://docs.openstack.org/mitaka/networking-guide/config-mtu.html

I deployed OpenStack Mitaka on Ubuntu Trusty.

Step-by-step reproduction steps:

1) Deploy OpenStack according to settings specified in "Version" section
2) Follow http://docs.openstack.org/mitaka/networking-guide/config-mtu.html (Case 1) and set:
   a) "global_physnet_mtu = 9000"
   b) "path_mtu = 9000"
3) Restart Neutron services on all nodes
4) Create a tenant network
5) Launch an instance 

Expected output (on compute node with running instance):

root@hypervisor3:~# ifconfig br-int | grep MTU
          BROADCAST MULTICAST  MTU:8950  Metric:1
root@hypervisor3:~# ifconfig br-tun | grep MTU
          BROADCAST MULTICAST  MTU:8950  Metric:1

Actual output (on compute node with running instance):

root@hypervisor3:~# ifconfig br-int | grep MTU
          BROADCAST MULTICAST  MTU:8950  Metric:1
root@hypervisor3:~# ifconfig br-tun | grep MTU
          BROADCAST MULTICAST  MTU:1500  Metric:1

Version:

OpenStack version: Mitaka
Neutron version: 8.3.0-0ubuntu1.1~cloud0
Linux distro: Ubuntu 14.04.5 LTS
Kernel: 4.4.0-53-generic
Tenant network type: VXLAN
Deployment mechanism: Juju (charms patched locally to support missing settings)

Environment:

Separate control and compute nodes
Controller services deployed in HA mode inside of LXD containers on control nodes
Neutron gateway deployed in HA mode on control nodes

Perceived severity:

High

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1650329

Title:
  Unable to influence MTU of br-tun using Neutron configuration settings

Status in neutron:
  New

Bug description:
  High level description:

  I am unable to influence MTU of br-tun using Neutron configuration
  settings. I am following instructions provided at the following
  website (Case 1):

  http://docs.openstack.org/mitaka/networking-guide/config-mtu.html

  I deployed OpenStack Mitaka on Ubuntu Trusty.

  Step-by-step reproduction steps:

  1) Deploy OpenStack according to settings specified in "Version" section
  2) Follow http://docs.openstack.org/mitaka/networking-guide/config-mtu.html (Case 1) and set:
     a) "global_physnet_mtu = 9000"
     b) "path_mtu = 9000"
  3) Restart Neutron services on all nodes
  4) Create a tenant network
  5) Launch an instance 

  Expected output (on compute node with running instance):

  root@hypervisor3:~# ifconfig br-int | grep MTU
            BROADCAST MULTICAST  MTU:8950  Metric:1
  root@hypervisor3:~# ifconfig br-tun | grep MTU
            BROADCAST MULTICAST  MTU:8950  Metric:1

  Actual output (on compute node with running instance):

  root@hypervisor3:~# ifconfig br-int | grep MTU
            BROADCAST MULTICAST  MTU:8950  Metric:1
  root@hypervisor3:~# ifconfig br-tun | grep MTU
            BROADCAST MULTICAST  MTU:1500  Metric:1

  Version:

  OpenStack version: Mitaka
  Neutron version: 8.3.0-0ubuntu1.1~cloud0
  Linux distro: Ubuntu 14.04.5 LTS
  Kernel: 4.4.0-53-generic
  Tenant network type: VXLAN
  Deployment mechanism: Juju (charms patched locally to support missing settings)

  Environment:

  Separate control and compute nodes
  Controller services deployed in HA mode inside of LXD containers on control nodes
  Neutron gateway deployed in HA mode on control nodes

  Perceived severity:

  High

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