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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

Public bug reported:

There is an option to configure mtu for interfaces created by L3 agent, however when setting up jumbo frames on instances, there could be a problem with outbound packets going from the subnet with jumbos to router interface on the subnet.
Depending on the OVS version such packets could be damaged/dropped which effectively prevents VMs from having external connectivity.

The issue is not in IP packet fragmentation on the gateway interface,
but rather with OVS handling jumbos on qr- interface.

We need to allow setting MTU for qr- interface, while preserving MTU on
qg-

** Affects: neutron
     Importance: Undecided
     Assignee: Eugene Nikanorov (enikanorov)
         Status: New


** Tags: l3-ipam-dhcp

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https://bugs.launchpad.net/bugs/1456399

Title:
  Add config option that allows separate configuration of router and
  gateway interfaces

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  There is an option to configure mtu for interfaces created by L3 agent, however when setting up jumbo frames on instances, there could be a problem with outbound packets going from the subnet with jumbos to router interface on the subnet.
  Depending on the OVS version such packets could be damaged/dropped which effectively prevents VMs from having external connectivity.

  The issue is not in IP packet fragmentation on the gateway interface,
  but rather with OVS handling jumbos on qr- interface.

  We need to allow setting MTU for qr- interface, while preserving MTU
  on qg-

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