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[Martin Hickey <martin.hickey@xxxxxxxxxx>]

** Changed in: neutron
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1540064

Title:
  neutron router-update --routes should prevent user from adding
  existing cidr

Status in neutron:
  Opinion

Bug description:
  Find this when do some debug.
  Steps to reproduce:
  1) I have a router with some subnets connected to it, for example 100.0.0.0/24 100.0.1.0/24. There will be some routes that are created by the kernel for the router interfaces.
  # ip r
  100.0.1.0/24 dev qr-fef63af2-82  proto kernel  scope link  src 100.0.1.1 
  100.0.0.0/24 dev qr-af2ae2b0-8c  proto kernel  scope link  src 100.0.0.1

  2) I update the extra route by (just for testing)
  neutron router-update router1 --route destination=100.0.1.0/24,nexthop=100.0.0.3 

  3) The route that was for 100.0.1.0/24 will be replaced.
  # ip r
  100.0.1.0/24 via 100.0.0.3 dev qr-af2ae2b0-8c 
  100.0.0.0/24 dev qr-af2ae2b0-8c  proto kernel  scope link  src 100.0.0.1

  4) I clear the extra route that I added by using 
  neutron router-update router1 --no-routes
  The I get the following routes in router namespace:
  # ip r
  100.0.0.0/24 dev qr-af2ae2b0-8c  proto kernel  scope link  src 100.0.0.1

  As a result, I lost the connection to 100.0.1.0/24.

  
  I think neutron should prevent user from adding extra routes to the existing cidrs that have been connected to router(as interface or as gateway).

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