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[Bug 1902512] [NEW] neutron-ovn-tripleo-ci-centos-8-containers-multinode fails on private networ creation (mtu size)

 

Public bug reported:

I saw same error on recent runs of this job so it seems to fail pretty reliably, for example:
https://16132fc56e10b0b2e527-31515d5a2aacd89ce671710b35dfe46f.ssl.cf2.rackcdn.com/758098/7/check/neutron-ovn-tripleo-ci-centos-8-containers-multinode/4c5218e/job-output.txt
https://zuul.opendev.org/t/openstack/build/f1898afb8970451d9bf48aefe8d3289c/logs

TASK [os_tempest : Ensure private network exists] ******************************
Thursday 29 October 2020  10:21:23 +0000 (0:00:00.091)       1:39:11.917 ******
FAILED - RETRYING: Ensure private network exists (5 retries left).
FAILED - RETRYING: Ensure private network exists (4 retries left).
FAILED - RETRYING: Ensure private network exists (3 retries left).
FAILED - RETRYING: Ensure private network exists (2 retries left).
FAILED - RETRYING: Ensure private network exists (1 retries left).
fatal: [undercloud -> 127.0.0.2]: FAILED! => {
    "attempts": 5,
    "changed": false
}

MSG:

BadRequestException: 400: Client Error for url:
http://192.168.24.30:9696/v2.0/networks.json, Invalid input for
operation: Requested MTU is too big, maximum is 1292.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ovn

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https://bugs.launchpad.net/bugs/1902512

Title:
  neutron-ovn-tripleo-ci-centos-8-containers-multinode fails on private
  networ creation (mtu size)

Status in neutron:
  New

Bug description:
  I saw same error on recent runs of this job so it seems to fail pretty reliably, for example:
  https://16132fc56e10b0b2e527-31515d5a2aacd89ce671710b35dfe46f.ssl.cf2.rackcdn.com/758098/7/check/neutron-ovn-tripleo-ci-centos-8-containers-multinode/4c5218e/job-output.txt
  https://zuul.opendev.org/t/openstack/build/f1898afb8970451d9bf48aefe8d3289c/logs

  TASK [os_tempest : Ensure private network exists] ******************************
  Thursday 29 October 2020  10:21:23 +0000 (0:00:00.091)       1:39:11.917 ******
  FAILED - RETRYING: Ensure private network exists (5 retries left).
  FAILED - RETRYING: Ensure private network exists (4 retries left).
  FAILED - RETRYING: Ensure private network exists (3 retries left).
  FAILED - RETRYING: Ensure private network exists (2 retries left).
  FAILED - RETRYING: Ensure private network exists (1 retries left).
  fatal: [undercloud -> 127.0.0.2]: FAILED! => {
      "attempts": 5,
      "changed": false
  }

  MSG:

  BadRequestException: 400: Client Error for url:
  http://192.168.24.30:9696/v2.0/networks.json, Invalid input for
  operation: Requested MTU is too big, maximum is 1292.

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