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Message #90742
[Bug 1998952] Re: The static route removes the local route from qrouter-namespace
Hello:
This documentation is present in the neutron-lib API reference:
https://docs.openstack.org/api-ref/network/v2/#routers-routers. There is
a warning message that warns about the issue described in this bug:
"""
By default in a router there is one route for each attached subnet. If you add an extra route that matches one of the default routes for a subnet, the existing subnet route will be overwritten. If the Neutron route is removed, the corresponding route will be removed as well. The affected subnet will subsequently lose connectivity to this router.
"""
Regards.
** Changed in: neutron
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1998952
Title:
The static route removes the local route from qrouter-namespace
Status in neutron:
Invalid
Bug description:
The static route removes the local route from qrouter-namespace
routing table.
I created two networks with subnet:
First:
#openstack network create Network-1 -f value -c id
784615c9-f9c4-4f4e-87d8-7e5dc76fde5e
#openstack subnet create sub-v4 --network 784615c9-f9c4-4f4e-87d8-7e5dc76fde5e --subnet-range 192.168.0.0/24 -f value -c id
0f1f9cfd-0956-46bd-9bcc-c6eca6fa522b
Second:
#openstack network create Network-2 -f value -c id
041011cc-e254-4326-afa7-9951686610fc
#openstack subnet create sub-v4 --network 041011cc-e254-4326-afa7-9951686610fc --subnet-range 172.16.0.0/24 -f value -c id
3a500e8f-9ef8-48de-a148-623d7fa8e580
Create router:
openstack router create Router-Openstack -f value -c id
3d9e5161-0c19-4bcd-abb8-9350bfcefb56
Added subnet to router:
#openstack router add subnet 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 0f1f9cfd-0956-46bd-9bcc-c6eca6fa522b
#openstack router add subnet 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 3a500e8f-9ef8-48de-a148-623d7fa8e580
I now have a router with two interfaces.
#openstack router show 3d9e5161-0c19-4bcd-abb8-9350bfcefb56
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | AZ1, AZ2, AZ3 |
| created_at | 2022-12-06T16:35:59Z |
| description | |
| external_gateway_info | null |
| flavor_id | None |
| id | 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 |
| interfaces_info | [{"port_id": "10db0b0e-7f54-4927-b9ad-4a69515e069c", "ip_address": "192.168.0.1", "subnet_id": "0f1f9cfd-0956-46bd-9bcc-c6eca6fa522b"}, {"port_id": "99dc5f15-1569-46f3-9d4f-4b907d7ae8fe", "ip_address": "172.16.0.1", "subnet_id": "3a500e8f-9ef8-48de-a148-623d7fa8e580"}] |
| location | Munch({'cloud': '', 'region_name': 'PL', 'zone': None, 'project': Munch({'id': 'afdfb965515f4724a21b6823764asdfg', 'name': 'myproject', 'domain_id': 'default', 'domain_name': None})}) |
| name | Router-Openstack |
| project_id | afdfb965515f4724a21b6823764asdfg |
| revision_number | 8 |
| routes | |
| status | ACTIVE |
| tags | |
| updated_at | 2022-12-06T16:37:58Z |
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Routing table from qrouter:
neutron-01:~# ip netns exec qrouter-3d9e5161-0c19-4bcd-abb8-9350bfcefb56 ip route
169.254.0.0/24 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.0.82
169.254.192.0/18 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.193.48
172.16.0.0/24 dev qr-99dc5f15-15 proto kernel scope link src 172.16.0.1
192.168.0.0/24 dev qr-10db0b0e-7f proto kernel scope link src 192.168.0.1
I added new static route.
#openstack router set 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 --route
destination=192.168.0.0/24,gateway=172.16.0.10
#openstack router show 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 -c routes
+--------+-----------------------------------------------------+
| Field | Value |
+--------+-----------------------------------------------------+
| routes | destination='192.168.0.0/24', gateway='172.16.0.10' |
+--------+-----------------------------------------------------+
Routing table from qrouter:
neutron-01:~# ip netns exec qrouter-3d9e5161-0c19-4bcd-abb8-9350bfcefb56 ip route
169.254.0.0/24 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.0.82
169.254.192.0/18 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.193.48
172.16.0.0/24 dev qr-99dc5f15-15 proto kernel scope link src 172.16.0.1
192.168.0.0/24 via 172.16.0.10 dev qr-99dc5f15-15 proto 112 <----- my static route
192.168.0.0/24 via 172.16.0.10 dev qr-99dc5f15-15 <----- my static route 2x? why 2x?
In this moment I removed wrong route:
#openstack router remove route 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 --route destination=192.168.0.0/24,gateway=172.16.0.10
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field | Value |
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| admin_state_up | UP |
| availability_zone_hints | |
| availability_zones | AZ1, AZ2, AZ3 |
| created_at | 2022-12-06T16:35:59Z |
| description | |
| distributed | False |
| external_gateway_info | null |
| flavor_id | None |
| ha | True |
| id | 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 |
| location | Munch({'cloud': '', 'region_name': 'PL', 'zone': None, 'project': Munch({'id': 'afdfb965515f4724a21b6823764asdfg', 'name': 'myproject', 'domain_id': 'default', 'domain_name': None})}) |
| name | Router-Openstack |
| project_id | afdfb965515f4724a21b6823764asdfg |
| revision_number | 10 |
| routes | |
| status | ACTIVE |
| tags | |
| updated_at | 2022-12-06T16:47:58Z |
+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Routing table after removing the static route:
neutron-01:~# ip netns exec qrouter-3d9e5161-0c19-4bcd-abb8-9350bfcefb56 ip route
169.254.0.0/24 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.0.82
169.254.192.0/18 dev ha-c5a65a6e-92 proto kernel scope link src 169.254.193.48
172.16.0.0/24 dev qr-99dc5f15-15 proto kernel scope link src 172.16.0.1
192.168.0.0/24 via 172.16.0.10 dev qr-99dc5f15-15 <--------------- the route is still present
#openstack router show 3d9e5161-0c19-4bcd-abb8-9350bfcefb56 -c routes
+--------+-------+
| Field | Value |
+--------+-------+
| routes | |
+--------+-------+
Why is it still showing the wrong entry in the routing table and the local route is missing?
I believe that after deleting the route, the routing entry should look like below:
192.168.0.0/24 dev qr-10db0b0e-7f proto kernel scope link src 192.168.0.1
Does anyone know how to solve this problem?
My software version:
neutron-01:~# dpkg -l | grep neutron | grep ii
ii neutron-bgp-dragent 2:16.0.0-0ubuntu0.20.04.1 all OpenStack Neutron Dynamic Routing - Agent
ii neutron-common 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - common
ii neutron-dhcp-agent 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - DHCP agent
ii neutron-dynamic-routing-common 2:16.0.0-0ubuntu0.20.04.1 all OpenStack Neutron Dynamic Routing - common files
ii neutron-fwaas-common 1:16.0.0-0ubuntu0.20.04.1 all Firewall-as-a-Service driver for OpenStack Neutron
ii neutron-l3-agent 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - l3 agent
ii neutron-linuxbridge-agent 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - linuxbridge agent
ii neutron-metadata-agent 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - metadata agent
ii neutron-plugin-ml2 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - ML2 plugin
ii neutron-server 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - server
ii neutron-vpnaas-common 2:16.0.0-0ubuntu0.20.04.1 all VPN-as-a-Service driver for OpenStack Neutron
ii python3-neutron 2:16.4.2-0ubuntu2 all Neutron is a virtual network service for Openstack - Python library
ii python3-neutron-dynamic-routing 2:16.0.0-0ubuntu0.20.04.1 all OpenStack Neutron Dynamic Routing - Python 3 library
ii python3-neutron-fwaas 1:16.0.0-0ubuntu0.20.04.1 all Firewall-as-a-Service driver for OpenStack Neutron
ii python3-neutron-lib 2.3.0-0ubuntu1 all Neutron shared routines and utilities - Python 3.x
ii python3-neutron-vpnaas 2:16.0.0-0ubuntu0.20.04.1 all VPN-as-a-Service driver for OpenStack Neutron
ii python3-neutronclient 1:7.1.1-0ubuntu1 all client API library for Neutron - Python 3.x
neutron-01:~# uname -a
Linux neutron-01 5.4.0-122-generic #138-Ubuntu SMP Wed Jun 22 15:00:31 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
neutron-01:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal
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References
