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[Zhangfeng HU <1858086@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When a virtual router connects a subnet of 192.168.1.0/24, the qrouter
namespace generates a local link route like '192.168.1.0/24 dev qr-
0f8e7575-3b proto kernel scope link src 192.168.1.1 metric 100'. If we
add a self-defined route '192.168.1.0/24, nexthop 192.168.1.100' into
the qrouter from dashboard, this route whll replace the prior local link
route. Then we remove this self-defined route from dashboard, the route
should be disappeared but the local link route cannot be restored, in
which case all the vms in 192.168.1.0/24 are unreachable any more.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1858086

Title:
  qrouter's local link route cannot be restored

Status in neutron:
  New

Bug description:
  When a virtual router connects a subnet of 192.168.1.0/24, the qrouter
  namespace generates a local link route like '192.168.1.0/24 dev qr-
  0f8e7575-3b proto kernel scope link src 192.168.1.1 metric 100'. If we
  add a self-defined route '192.168.1.0/24, nexthop 192.168.1.100' into
  the qrouter from dashboard, this route whll replace the prior local
  link route. Then we remove this self-defined route from dashboard, the
  route should be disappeared but the local link route cannot be
  restored, in which case all the vms in 192.168.1.0/24 are unreachable
  any more.

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