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[Quan Tian <tianquan@xxxxxxxxxx>]

Public bug reported:

According to [1], when network contains more that one IPv4 subnets, report these subnets in 'classless-static-routes' DHCP option.
However, the 'classless-static-routes' of dhcp disabled subnets will be deleted after dhcp agents restart because the DhcpRpcCallback.get_active_networks_info method used for synchronize networks filter subnets with "enable_dhcp=True". Then VMs can't access the other VMs in the dhcp disabled subnets in the same network.

[1] https://review.openstack.org/#/c/125043/

How to reproduce:

1. create a network with two subnets in it, disable one subnet's dhcp.
+--------------------------------------+----------------------+----------------+-------------+
| id                                   | name                 | cidr           | enable_dhcp |
+--------------------------------------+----------------------+----------------+-------------+
| 1b14508b-a381-4d73-9128-c05661497c49 | subnet_dhcp_enabled  | 192.168.1.0/24 | True        |
| 3572a614-79f0-4b4d-8850-60e74225745a | subnet_dhcp_disabled | 192.168.2.0/24 | False       |
+--------------------------------------+----------------------+----------------+-------------+

At this time, dhcp opts should like this:

$ cat neutron/dhcp/004a4f00-f8cf-4c11-a9e7-52bc9961c297/opts
tag:tag0,option:classless-static-route,192.168.2.0/24,0.0.0.0,0.0.0.0/0,192.168.1.1
tag:tag0,249,192.168.2.0/24,0.0.0.0,0.0.0.0/0,192.168.1.1
tag:tag0,option:router,192.168.1.1

2. restart the dhcp agent, the "classless-static-routes" disappear

$ cat neutron/dhcp/004a4f00-f8cf-4c11-a9e7-52bc9961c297/opts
tag:tag0,option:router,192.168.1.1

** Affects: neutron
     Importance: Undecided
     Assignee: Quan Tian (tianquan23)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1652654

Title:
  Routes for neighbour subnets missing after dhcp agents restart

Status in neutron:
  In Progress

Bug description:
  According to [1], when network contains more that one IPv4 subnets, report these subnets in 'classless-static-routes' DHCP option.
  However, the 'classless-static-routes' of dhcp disabled subnets will be deleted after dhcp agents restart because the DhcpRpcCallback.get_active_networks_info method used for synchronize networks filter subnets with "enable_dhcp=True". Then VMs can't access the other VMs in the dhcp disabled subnets in the same network.

  [1] https://review.openstack.org/#/c/125043/

  How to reproduce:

  1. create a network with two subnets in it, disable one subnet's dhcp.
  +--------------------------------------+----------------------+----------------+-------------+
  | id                                   | name                 | cidr           | enable_dhcp |
  +--------------------------------------+----------------------+----------------+-------------+
  | 1b14508b-a381-4d73-9128-c05661497c49 | subnet_dhcp_enabled  | 192.168.1.0/24 | True        |
  | 3572a614-79f0-4b4d-8850-60e74225745a | subnet_dhcp_disabled | 192.168.2.0/24 | False       |
  +--------------------------------------+----------------------+----------------+-------------+

  At this time, dhcp opts should like this:

  $ cat neutron/dhcp/004a4f00-f8cf-4c11-a9e7-52bc9961c297/opts
  tag:tag0,option:classless-static-route,192.168.2.0/24,0.0.0.0,0.0.0.0/0,192.168.1.1
  tag:tag0,249,192.168.2.0/24,0.0.0.0,0.0.0.0/0,192.168.1.1
  tag:tag0,option:router,192.168.1.1

  2. restart the dhcp agent, the "classless-static-routes" disappear

  $ cat neutron/dhcp/004a4f00-f8cf-4c11-a9e7-52bc9961c297/opts
  tag:tag0,option:router,192.168.1.1

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