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[Rodolfo Alonso <1907548@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1907548

Title:
  vlan-transparency not working with linuxbridge ml2 agent

Status in neutron:
  Won't Fix

Bug description:
  After vlan-transparency (VT) support has been added for OVN ML2 agent,
  we are creating some neutron tempest tests to cover this
  functionality.

  Since linuxbridge (LB) agent supports VT, we intended to run those new
  tests on the master LB job, but they fail.

  We configured the LB agent with VT support. Devstack configures ml2 mechanism_drivers to openvswitch and linuxbridge, so we had to set it to LB only.
  https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/765002/7/zuul.d/master_jobs.yaml

  New VT tests failed: 
  2020-12-09 13:05:37.184727 | controller | {0} neutron_tempest_plugin.scenario.test_vlan_transparency.VlanTransparencyTest.test_vlan_transparent_allowed_address_pairs [310.736639s] ... FAILED
  2020-12-09 13:05:37.185480 | controller | Details: {'code': 500, 'created': '2020-12-09T13:05:35Z', 'message': 'Build of instance e0513133-3077-420e-b439-e0f61ff0fbad aborted: Failed to allocate the network(s), not rescheduling.'}
  https://zuul.opendev.org/t/openstack/build/d4f0a6a2a3824705886536e5d900a49e/log/job-output.txt#25261


  nova-compute logs show errors creating instances:
  Dec 09 13:05:33.788419 ubuntu-focal-rax-iad-0022130345 nova-compute[73187]: ERROR nova.compute.manager [None req-c4f267db-cf04-4597-bbcc-e95ce67db222 tempest-VlanTransparencyTest-301394299 tempest-VlanTransparencyTest-301394299] [instance: e0513133-3077-420e-b439-e0f61ff0fbad] Instance failed to spawn: nova.exception.VirtualInterfaceCreateException: Virtual Interface creation failed
  https://zuul.opendev.org/t/openstack/build/d4f0a6a2a3824705886536e5d900a49e/log/controller/logs/screen-n-cpu.txt?severity=4


  neutron-linuxbridge-agent shows some errors too:
  Dec 09 12:27:01.234687 ubuntu-focal-rax-iad-0022130345 neutron-linuxbridge-agent[66293]: ERROR neutron.agent.linux.utils [None req-ddbe0c50-3fb7-4834-9404-f6a8988be69b None None] Exit code: 255; Cmd: ['sysctl', '-w', 'net.ipv6.conf.vxlan-3.disable_ipv6=1']; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/vxlan-3/disable_ipv6: No such file or directory
  https://zuul.opendev.org/t/openstack/build/d4f0a6a2a3824705886536e5d900a49e/log/controller/logs/screen-q-agt.txt?severity=4

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