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[Swaminathan Vasudevan <souminathan@xxxxxxxxx>]

Public bug reported:

When external bridge is configured in Neutron, the FIP Agent Gateway
port 'fg-' is tagged as a DEAD port with Vlan id of 4095.

This issue is seen in Pike.

It seems that there was fix that recently merged in neutron shown below
https://review.openstack.org/#/c/564825/10

Based on this patch, the 4095 vlan tag for the 'qg-' is removed when
external bridge is configured. But it has not been handled for the DVR
FIP agent gateway port.

So we are seeing the port as DEAD always, when external bridge such as
'br-vlan1087' is configured.

Bridge "br-vlan1087"
        Port "br-vlan1087"
            Interface "br-vlan1087"
                type: internal
        Port "vlan1087"
            Interface "vlan1087"
        Port "fg-0a4a425d-d5"
            tag: 4095
            Interface "fg-0a4a425d-d5"
                type: internal
    ovs_version: "2.7.0"

** Affects: neutron
     Importance: High
         Status: Confirmed


** Tags: l3-dvr-backlog

** Changed in: neutron
       Status: New => Confirmed

** Changed in: neutron
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1778643

Title:
  DVR: Fip gateway port is tagged as DEAD port by OVS when
  external_bridge is configured

Status in neutron:
  Confirmed

Bug description:
  When external bridge is configured in Neutron, the FIP Agent Gateway
  port 'fg-' is tagged as a DEAD port with Vlan id of 4095.

  This issue is seen in Pike.

  It seems that there was fix that recently merged in neutron shown below
  https://review.openstack.org/#/c/564825/10

  Based on this patch, the 4095 vlan tag for the 'qg-' is removed when
  external bridge is configured. But it has not been handled for the DVR
  FIP agent gateway port.

  So we are seeing the port as DEAD always, when external bridge such as
  'br-vlan1087' is configured.

  Bridge "br-vlan1087"
          Port "br-vlan1087"
              Interface "br-vlan1087"
                  type: internal
          Port "vlan1087"
              Interface "vlan1087"
          Port "fg-0a4a425d-d5"
              tag: 4095
              Interface "fg-0a4a425d-d5"
                  type: internal
      ovs_version: "2.7.0"

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