L3 agent(agent_mode=dvr_snat) restart, fip namespace removed rfp-port, resulting in fip not connecting

[liujinxin]

stable/victoria

openstack network node(agent_mode=dvr_snat) and compute node are the same node，the VM on this node is bound to fip, but the snat_port of the router of this VM is located in another network node,VM can access north-south traffic via fip.But if you restart the l3-agent,The external_gateway_removed is called during l3-agent restart, causing the fip on that node to be unreachable

https://github.com/openstack/neutron/blob/stable/victoria/neutron/agent/l3/dvr_edge_router.py #180
https://github.com/openstack/neutron/blob/stable/victoria/neutron/agent/l3/dvr_edge_router.py #56
https://github.com/openstack/neutron/blob/stable/victoria/neutron/agent/l3/dvr_local_router.py #669

[Brian Haley (brian-haley)]

Can you tell me what the latest commit in the stable/victoria you're using is? Thanks.

[liujinxin (scilla)]

Hi,Brian
The lastest commit I used was https://github.com/openstack/neutron/commit/b01e0c2aa98866df9c25e20a66c02fccccdc7885

[Brian Haley (brian-haley)]

Thanks for the info. Is it possible to try with a later version? There are a couple of DVR bugs fixed in the branch since that change in 2019 and I want to make sure it's still broken.

[liujinxin (scilla)]

The problem is caused by this commit(https://github.com/openstack/neutron/commit/7a9d6d26419defa148764166600bc4ac6b50c109 )

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/855995

[LIU Yulong (dragon889)]

We had marked dvr_snat + compute as not supported:
https://meetings.opendev.org/meetings/networking/2021/networking.2021-07-20-14.00.log.html#l-113
https://review.opendev.org/c/openstack/neutron/+/801503

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Rodolfo Alonso <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/855995
Reason: Please, feel free to restore the patch, address the comments and rebase the patch.