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[yangjianfeng <1903433@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Reproduction steps：
1. Create an external network and create two subnet base on the network, this subnet cidrs as below:
ext-subnet01: 172.24.4.0/24
ext-subnet02: 10.20.30.0/24

2. Create a router and set external gateway on the external network for the router. Now, in the router's namespace the routes as below:
# ip netns exec qrouter-d91e7918-b511-4dd8-9f8f-4db0dacbfb4d ip r
default via 172.24.4.1 dev qg-38d2f0b6-96 proto static 
10.20.30.0/24 dev qg-38d2f0b6-96 proto static scope link 
172.24.4.0/24 dev qg-38d2f0b6-96 proto kernel scope link src 172.24.4.32

3. Create a tenant network, and create a subnet base on the tenant network, the ssubnet cidr as below:
tenant-subnet: 10.20.30.0/24  (It's same with the ext-subnet02's cidr)

4. Add the tenant-subnet to the router which created at step 2. Then, in the router's namespace the routes as below:
# ip netns exec qrouter-d91e7918-b511-4dd8-9f8f-4db0dacbfb4d ip r
default via 172.24.4.1 dev qg-38d2f0b6-96 proto static 
10.20.30.0/24 dev qg-38d2f0b6-96 proto static scope link 
10.20.30.0/24 dev qr-7b3f8319-45 proto kernel scope link src 10.20.30.1 
172.24.4.0/24 dev qg-38d2f0b6-96 proto kernel scope link src 172.24.4.32

The duplicate routes (10.20.30.0/24) will disturb the North-South
packets' forward, result the traffic breaking.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1903433

Title:
  The duplicate route in l3 router namespace results in North-South
  traffic breaking

Status in neutron:
  New

Bug description:
  Reproduction steps：
  1. Create an external network and create two subnet base on the network, this subnet cidrs as below:
  ext-subnet01: 172.24.4.0/24
  ext-subnet02: 10.20.30.0/24

  2. Create a router and set external gateway on the external network for the router. Now, in the router's namespace the routes as below:
  # ip netns exec qrouter-d91e7918-b511-4dd8-9f8f-4db0dacbfb4d ip r
  default via 172.24.4.1 dev qg-38d2f0b6-96 proto static 
  10.20.30.0/24 dev qg-38d2f0b6-96 proto static scope link 
  172.24.4.0/24 dev qg-38d2f0b6-96 proto kernel scope link src 172.24.4.32

  3. Create a tenant network, and create a subnet base on the tenant network, the ssubnet cidr as below:
  tenant-subnet: 10.20.30.0/24  (It's same with the ext-subnet02's cidr)

  4. Add the tenant-subnet to the router which created at step 2. Then, in the router's namespace the routes as below:
  # ip netns exec qrouter-d91e7918-b511-4dd8-9f8f-4db0dacbfb4d ip r
  default via 172.24.4.1 dev qg-38d2f0b6-96 proto static 
  10.20.30.0/24 dev qg-38d2f0b6-96 proto static scope link 
  10.20.30.0/24 dev qr-7b3f8319-45 proto kernel scope link src 10.20.30.1 
  172.24.4.0/24 dev qg-38d2f0b6-96 proto kernel scope link src 172.24.4.32

  The duplicate routes (10.20.30.0/24) will disturb the North-South
  packets' forward, result the traffic breaking.

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