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[ZongKai LI <lzklibj@xxxxxxxxxx>]

Public bug reported:

### env ###
upstream code
DVR enabled
2 network nodes(l3 agent running in dvr_snat mode), 1 compute node(l3 agent running in dvr mode)
2 tenants: admin and demo

### steps(by admin) ###
1, create external network and internal network, create subnets for the two networks, 
2, create a router(dvr default), attach external network as router gateway, attach internal network as router interface;
3, verify router schedules success by "neutron l3-agent-list-hosting-router" or "ip netns"
4, create a floatingip, boot a VM on internal subnet, and associate floatingip to VM;
5, verify the dvr and floatingip related ports are created by "neutron port-list -c device_owner"

6, run "neutron net-update EXTERNAL-NETWORK --shared False"
expected: "Updated network: EXTERNAL-NETWORK"
observed: "Unable to reconfigure sharing settings for network EXTERNAL-NETWORK. Multiple tenants are using it."

### analyse ###
1, even all ports on EXTERNAL-NETWORK are belong to admin tenant, still fail to update EXTERNAL-NETWORK shared attribute.
2, _validate_shared_update fails to work as expected for not all ports on EXTERNAL-NETWORK have tenant_id.
3, following dvr and floatingip related ports have no tenant_id, _validate_shared_update need be fixed for them:
fg: network:floatingip_agent_gateway
sg: network:router_centralized_snat

** Affects: neutron
     Importance: Undecided
     Assignee: ZongKai LI (lzklibj)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => ZongKai LI (lzklibj)

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https://bugs.launchpad.net/bugs/1522482

Title:
  dvr gateway port fails in _validate_shared_update

Status in neutron:
  New

Bug description:
  ### env ###
  upstream code
  DVR enabled
  2 network nodes(l3 agent running in dvr_snat mode), 1 compute node(l3 agent running in dvr mode)
  2 tenants: admin and demo

  ### steps(by admin) ###
  1, create external network and internal network, create subnets for the two networks, 
  2, create a router(dvr default), attach external network as router gateway, attach internal network as router interface;
  3, verify router schedules success by "neutron l3-agent-list-hosting-router" or "ip netns"
  4, create a floatingip, boot a VM on internal subnet, and associate floatingip to VM;
  5, verify the dvr and floatingip related ports are created by "neutron port-list -c device_owner"

  6, run "neutron net-update EXTERNAL-NETWORK --shared False"
  expected: "Updated network: EXTERNAL-NETWORK"
  observed: "Unable to reconfigure sharing settings for network EXTERNAL-NETWORK. Multiple tenants are using it."

  ### analyse ###
  1, even all ports on EXTERNAL-NETWORK are belong to admin tenant, still fail to update EXTERNAL-NETWORK shared attribute.
  2, _validate_shared_update fails to work as expected for not all ports on EXTERNAL-NETWORK have tenant_id.
  3, following dvr and floatingip related ports have no tenant_id, _validate_shared_update need be fixed for them:
  fg: network:floatingip_agent_gateway
  sg: network:router_centralized_snat

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