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[masterpe <1954777@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

* High level description:

When creating a static route in a l3 router where the destination subnet
already exists as connected network.

Adding the route will remove the directly connected network and add the
static route.

After removing the static route the directly connected route does not
get restated.


* Pre-conditions: 

This has been tested on Ussuri, with:
- Neutron Linux bridge agent
- Neutron L3 agent
- Neutron

* Step-by-step reproduction steps:

Creating a route where the destination already exists
# openstack network create network1
# openstack subnet create --network network1 --subnet-range 192.168.1.0/24 network1-sub-1
# openstack network create network2
# openstack subnet create --network network2 --subnet-range 192.168.2.0/24 network2-sub-1
# openstack router create router1
# openstack router add subnet router1 network1-sub-1
# openstack router add subnet router1 network2-sub-1

# Add the route, this will remove the connected network and add a static route
# openstack router add route --route destination=192.168.1.0/24,gateway=192.168.2.10 router1

# remove the static route, this will remove the route but will not add the connected network
# openstack router remove route --route destination=192.168.1.0/24,gateway=192.168.2.10 router1


It is also possible to create a route in the same network:
# openstack network create network1
# openstack subnet create --network network1 --subnet-range 192.168.1.0/24 network1-sub-1
# openstack router create router1
# openstack router add subnet router1 network1-sub-1
# openstack router add route --route destination=192.168.1.0/24,gateway=192.168.1.10 router1
# openstack router remove route --route destination=192.168.1.0/24,gateway=192.168.1.10 router1


* Expected output:
1. Or that the connected route will never get removed
2. Or that the connected route restated when the static route is removed

* Version:
  ** OpenStack version: Ussuri
  ** Ubuntu Bionic

* Environment:

* Perceived severity:
This can be a high impact when the customer add a route where the destination has high/important traffic in that flow.

* Workaround
- Currently by disabling the router and then enabling the router will rebuild the who router and so also the missing routes.

-  Using "neutron l3-agent-router-remove" and "neutron l3-agent-router-
add" commands will also rebuilt the router

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: neutron neutron-l3-agent static-route

** Tags added: neutron

** Tags added: neutron-l3-agent static-route

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https://bugs.launchpad.net/bugs/1954777

Title:
  setting same static route with subnet already exists as direct
  connected network

Status in neutron:
  New

Bug description:
  * High level description:

  When creating a static route in a l3 router where the destination
  subnet already exists as connected network.

  Adding the route will remove the directly connected network and add
  the static route.

  After removing the static route the directly connected route does not
  get restated.

  
  * Pre-conditions: 

  This has been tested on Ussuri, with:
  - Neutron Linux bridge agent
  - Neutron L3 agent
  - Neutron

  * Step-by-step reproduction steps:

  Creating a route where the destination already exists
  # openstack network create network1
  # openstack subnet create --network network1 --subnet-range 192.168.1.0/24 network1-sub-1
  # openstack network create network2
  # openstack subnet create --network network2 --subnet-range 192.168.2.0/24 network2-sub-1
  # openstack router create router1
  # openstack router add subnet router1 network1-sub-1
  # openstack router add subnet router1 network2-sub-1

  # Add the route, this will remove the connected network and add a static route
  # openstack router add route --route destination=192.168.1.0/24,gateway=192.168.2.10 router1

  # remove the static route, this will remove the route but will not add the connected network
  # openstack router remove route --route destination=192.168.1.0/24,gateway=192.168.2.10 router1

  
  It is also possible to create a route in the same network:
  # openstack network create network1
  # openstack subnet create --network network1 --subnet-range 192.168.1.0/24 network1-sub-1
  # openstack router create router1
  # openstack router add subnet router1 network1-sub-1
  # openstack router add route --route destination=192.168.1.0/24,gateway=192.168.1.10 router1
  # openstack router remove route --route destination=192.168.1.0/24,gateway=192.168.1.10 router1

  
  * Expected output:
  1. Or that the connected route will never get removed
  2. Or that the connected route restated when the static route is removed

  * Version:
    ** OpenStack version: Ussuri
    ** Ubuntu Bionic

  * Environment:

  * Perceived severity:
  This can be a high impact when the customer add a route where the destination has high/important traffic in that flow.

  * Workaround
  - Currently by disabling the router and then enabling the router will rebuild the who router and so also the missing routes.

  -  Using "neutron l3-agent-router-remove" and "neutron l3-agent-
  router-add" commands will also rebuilt the router

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