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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

ENV: stable/queens, but master branch has the same code.

There are some extremly conditions which will result the unbound router
gateway port. Then all the centrilized floating IPs will not be
reachable since the gateway port was set to 4095 tag.

How to reproduce:
just simply creating dvr HA router, set gateway, and add interface.
You can run the following script 100 times to create 100 routers:
for i in {1..100};do script.sh $i;done
Then you may see there are some gatway ports are set to 4095 in the snat node.

Test script:
function create_net_struct()
{
  neutron router-create scale-test-router-${1}
  neutron net-create scale-test-net-${1}
  neutron subnet-create --name scale-test-subnet-${1} scale-test-net-${1} 192.168.${1}.0/24
  neutron router-gateway-set scale-test-router-${1} public
  neutron router-interface-add scale-test-router-${1} subnet=scale-test-subnet-${1}
}

create_net_struct $1

** Affects: neutron
     Importance: Undecided
     Assignee: LIU Yulong (dragon889)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => LIU Yulong (dragon889)

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https://bugs.launchpad.net/bugs/1827754

Title:
  [L3] snat gateway port may stay 4095 after router fully initialized in
  l3 agent

Status in neutron:
  New

Bug description:
  ENV: stable/queens, but master branch has the same code.

  There are some extremly conditions which will result the unbound
  router gateway port. Then all the centrilized floating IPs will not be
  reachable since the gateway port was set to 4095 tag.

  How to reproduce:
  just simply creating dvr HA router, set gateway, and add interface.
  You can run the following script 100 times to create 100 routers:
  for i in {1..100};do script.sh $i;done
  Then you may see there are some gatway ports are set to 4095 in the snat node.

  Test script:
  function create_net_struct()
  {
    neutron router-create scale-test-router-${1}
    neutron net-create scale-test-net-${1}
    neutron subnet-create --name scale-test-subnet-${1} scale-test-net-${1} 192.168.${1}.0/24
    neutron router-gateway-set scale-test-router-${1} public
    neutron router-interface-add scale-test-router-${1} subnet=scale-test-subnet-${1}
  }

  create_net_struct $1

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