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[OpenStack Infra <1552089@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

https://review.openstack.org/283790
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/neutron" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 4df8d9a7016ab20fce235833d792b89309ec98a7
Author: Kevin Benton <kevin@xxxxxxxxxx>
Date:   Mon Feb 22 16:41:45 2016 -0800

    Make agent interface plugging utilize network MTU
    
    This changes the 'plug' and 'plug_new' interfaces of the
    LinuxInterfaceDriver to accept an MTU argument. It then
    updates the dhcp agent and l3 agent to pass the MTU that
    is set on the network that the port belongs to. This allows
    it to take into account the overhead calculations that are
    done for encapsulation types.
    
    It's necessary for the L3 agent to have the MTU because it
    must recognize when fragmentation is needed so it can fragment
    or generate an ICMP error.
    
    It's necessary for the DHCP agent to have the MTU so it doesn't
    interfere when it plugs into a bridge with a larger than 1500
    MTU (the bridge would reduce its MTU to match the agent).
    
    If an operator sets 'network_device_mtu', the value of that
    will be used instead to preserve previous behavior.
    
    Closes-Bug: #1549470
    Closes-Bug: #1542108
    Closes-Bug: #1542475
    DocImpact: Neutron agents now support arbitrary MTU
               configurations on each network (including
               jumbo frames). This is accomplished by checking
               the MTU value defined for each network on which
               it is wiring VIFs.
    Co-Authored-By: Matt Kassawara <mkassawara@xxxxxxxxx>
    Change-Id: Ic091fa78dfd133179c71cbc847bf955a06cb248a

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: doc neutron

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https://bugs.launchpad.net/bugs/1552089

Title:
      Make agent interface plugging utilize network MTU

Status in neutron:
  New

Bug description:
  https://review.openstack.org/283790
  Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
  Your project "openstack/neutron" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

  commit 4df8d9a7016ab20fce235833d792b89309ec98a7
  Author: Kevin Benton <kevin@xxxxxxxxxx>
  Date:   Mon Feb 22 16:41:45 2016 -0800

      Make agent interface plugging utilize network MTU
      
      This changes the 'plug' and 'plug_new' interfaces of the
      LinuxInterfaceDriver to accept an MTU argument. It then
      updates the dhcp agent and l3 agent to pass the MTU that
      is set on the network that the port belongs to. This allows
      it to take into account the overhead calculations that are
      done for encapsulation types.
      
      It's necessary for the L3 agent to have the MTU because it
      must recognize when fragmentation is needed so it can fragment
      or generate an ICMP error.
      
      It's necessary for the DHCP agent to have the MTU so it doesn't
      interfere when it plugs into a bridge with a larger than 1500
      MTU (the bridge would reduce its MTU to match the agent).
      
      If an operator sets 'network_device_mtu', the value of that
      will be used instead to preserve previous behavior.
      
      Closes-Bug: #1549470
      Closes-Bug: #1542108
      Closes-Bug: #1542475
      DocImpact: Neutron agents now support arbitrary MTU
                 configurations on each network (including
                 jumbo frames). This is accomplished by checking
                 the MTU value defined for each network on which
                 it is wiring VIFs.
      Co-Authored-By: Matt Kassawara <mkassawara@xxxxxxxxx>
      Change-Id: Ic091fa78dfd133179c71cbc847bf955a06cb248a

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