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[OpenStack Infra <1520775@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Expired => In Progress

** Changed in: neutron
     Assignee: (unassigned) => Hong Hui Xiao (xiaohhui)

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https://bugs.launchpad.net/bugs/1520775

Title:
  Update the gateway of external net won't affect router

Status in neutron:
  In Progress

Bug description:
  I found this one when build up a test env.

  Steps to reproduce:
  1) I create a set of external network, internal network and router. The external network has gateway ip in its subnet.
  2) connect the external, internal network and router, by using router-gateway-set, router-interface-add.
  3) Then I realize my physical network doesn't have a gateway. So I update the subnet of external network with --no-gateway.
  4) I can't see the default route be deleted in router namespace, even if I restart l3-agent.

  
  I try it in legacy router and DVR, they both have this problem, and I believe HA router will have this problem.

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