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[OpenStack Infra <2053274@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/909684
Committed: https://opendev.org/openstack/neutron/commit/47b4d14955451c320ce612e4e2e7d0a896e2fe36
Submitter: "Zuul (22348)"
Branch:    master

commit 47b4d14955451c320ce612e4e2e7d0a896e2fe36
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Wed Feb 21 15:34:13 2024 +0000

    [OVN] Set MTU of the VETH interfaces between OVS and metadata
    
    The VETH pair between the metadata namespace and the local OVS now
    has the same MTU as the network associated to this metadata service.
    The "LSP.external_ids" field has a new key defined: "neutron:mtu".
    This is the value of the network MTU.
    
    This patch does not update the previous metadata datapaths nor the
    existing LSP. This change will affect only to new created ports
    and the corresponding metadata datapaths.
    
    Closes-Bug: #2053274
    
    Change-Id: I7ff300e9634e5e3fc68d70540392109fd8b9babc


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2053274

Title:
  [ovn] mtu for metadata veth interface is not set

Status in neutron:
  Fix Released

Bug description:
  When using OVN, the `veth` interfaces which get created inside the
  network namespace (and the other half that goes into the OVS bridge)
  both do not get an MTU configured for them when they are provisioned.

  https://github.com/openstack/neutron/blob/stable/zed/neutron/agent/ovn/metadata/agent.py#L589-L594

  This can cause some unknown/annoying errors with packets being dropped
  if a user is hitting large requests on the metadata service, the ideal
  solution would be to configure the correct MTU for the interface to
  avoid this issue.

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