Public bug reported: High level description: If a neutron router is connected to a provider network 'A' and private geneve networks, a change of the provider network MTU does not always update router port gateway_mtu option even if provider network has MTU smaller than the private network.
Reproduction scenario: openstack router create r1 openstack router set --external-gateway public r1 openstack network create net1 openstack subnet create --subnet-range 192.168.100.0/24 --network net1 subnet1 openstack router add subnet r1 subnet1 stack@devstack:~/devstack$ crudini --get /etc/neutron/plugins/ml2/ml2_conf.ini ovn ovn_emit_need_to_frag True stack@devstack:~/devstack$ openstack router show r1 -c id -f value 610f7fcb-40c2-4221-b535-8f5548de6fa5 stack@devstack:~/devstack$ openstack port list --device-id=610f7fcb-40c2-4221-b535-8f5548de6fa5 --device-owner=network:router_gateway -c ID -f value c765a42c-9736-45b8-a2c9-c362bc221119 stack@devstack:~/devstack$ openstack network show net1 -c mtu -f value 1372 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1330 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Private network has bigger mtu than the public one so the case described in https://bugs.launchpad.net/neutron/+bug/1951559 is not relevant and gateway_mtu option is expected to be updated after public mtu change stack@devstack:~/devstack$ openstack network set --mtu 1300 public stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:46:32 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" Wed Apr 10 14:50:04 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 Wed Apr 10 14:54:25 UTC 2024 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:57:30 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 15:13:36 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Router port gateway_mtu option remains unchanged for a long time after value in neutron db has been changed. Found on master devstack deployed on ubuntu-jammy. ** Affects: neutron Importance: Undecided Status: New ** Description changed: High level description: - If a neutron router is connected to a provider network 'A' and private geneve networks changing the provider network MTU does not always update router port gateway_mtu option even if provider network has MTU smaller than the private network. + If a neutron router is connected to a provider network 'A' and private geneve networks, a change of the provider network MTU does not always update router port gateway_mtu option even if provider network has MTU smaller than the private network. Reproduction scenario: openstack router create r1 openstack router set --external-gateway public r1 openstack network create net1 openstack subnet create --subnet-range 192.168.100.0/24 --network net1 subnet1 openstack router add subnet r1 subnet1 stack@devstack:~/devstack$ openstack router show r1 -c id -f value 610f7fcb-40c2-4221-b535-8f5548de6fa5 stack@devstack:~/devstack$ openstack port list --device-id=610f7fcb-40c2-4221-b535-8f5548de6fa5 --device-owner=network:router_gateway -c ID -f value c765a42c-9736-45b8-a2c9-c362bc221119 - stack@devstack:~/devstack$ openstack network show net1 -c mtu -f value 1372 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1330 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Private network has bigger mtu than the public one so the case described in https://bugs.launchpad.net/neutron/+bug/1951559 is not relevant and gateway_mtu option is expected to be updated after public mtu change - stack@devstack:~/devstack$ openstack network set --mtu 1300 public stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:46:32 UTC 2024 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" Wed Apr 10 14:50:04 UTC 2024 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 Wed Apr 10 14:54:25 UTC 2024 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:57:30 UTC 2024 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 15:13:36 UTC 2024 - stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu + stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Router port gateway_mtu option remains unchanged for a long time after value in neutron db has been changed. Found on master devstack deployed on ubuntu-jammy. ** Description changed: High level description: If a neutron router is connected to a provider network 'A' and private geneve networks, a change of the provider network MTU does not always update router port gateway_mtu option even if provider network has MTU smaller than the private network. Reproduction scenario: openstack router create r1 openstack router set --external-gateway public r1 openstack network create net1 openstack subnet create --subnet-range 192.168.100.0/24 --network net1 subnet1 openstack router add subnet r1 subnet1 + + stack@devstack:~/devstack$ crudini --get /etc/neutron/plugins/ml2/ml2_conf.ini ovn ovn_emit_need_to_frag + True stack@devstack:~/devstack$ openstack router show r1 -c id -f value 610f7fcb-40c2-4221-b535-8f5548de6fa5 stack@devstack:~/devstack$ openstack port list --device-id=610f7fcb-40c2-4221-b535-8f5548de6fa5 --device-owner=network:router_gateway -c ID -f value c765a42c-9736-45b8-a2c9-c362bc221119 stack@devstack:~/devstack$ openstack network show net1 -c mtu -f value 1372 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1330 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Private network has bigger mtu than the public one so the case described in https://bugs.launchpad.net/neutron/+bug/1951559 is not relevant and gateway_mtu option is expected to be updated after public mtu change stack@devstack:~/devstack$ openstack network set --mtu 1300 public stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:46:32 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" Wed Apr 10 14:50:04 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 Wed Apr 10 14:54:25 UTC 2024 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:57:30 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 15:13:36 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Router port gateway_mtu option remains unchanged for a long time after value in neutron db has been changed. Found on master devstack deployed on ubuntu-jammy. -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/2060828 Title: [OVN] Changing public network MTU does not update router port gateway_mtu option Status in neutron: New Bug description: High level description: If a neutron router is connected to a provider network 'A' and private geneve networks, a change of the provider network MTU does not always update router port gateway_mtu option even if provider network has MTU smaller than the private network. Reproduction scenario: openstack router create r1 openstack router set --external-gateway public r1 openstack network create net1 openstack subnet create --subnet-range 192.168.100.0/24 --network net1 subnet1 openstack router add subnet r1 subnet1 stack@devstack:~/devstack$ crudini --get /etc/neutron/plugins/ml2/ml2_conf.ini ovn ovn_emit_need_to_frag True stack@devstack:~/devstack$ openstack router show r1 -c id -f value 610f7fcb-40c2-4221-b535-8f5548de6fa5 stack@devstack:~/devstack$ openstack port list --device-id=610f7fcb-40c2-4221-b535-8f5548de6fa5 --device-owner=network:router_gateway -c ID -f value c765a42c-9736-45b8-a2c9-c362bc221119 stack@devstack:~/devstack$ openstack network show net1 -c mtu -f value 1372 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1330 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Private network has bigger mtu than the public one so the case described in https://bugs.launchpad.net/neutron/+bug/1951559 is not relevant and gateway_mtu option is expected to be updated after public mtu change stack@devstack:~/devstack$ openstack network set --mtu 1300 public stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:46:32 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" Wed Apr 10 14:50:04 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 Wed Apr 10 14:54:25 UTC 2024 stack@devstack:~/devstack$ openstack network show public -c mtu -f value 1300 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 14:57:30 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" stack@devstack:~/devstack$ date Wed Apr 10 15:13:36 UTC 2024 stack@devstack:~/devstack$ sudo ovn-nbctl --db=unix:/usr/local/var/run/ovn/ovnnb_db.sock get logical_router_port lrp-c765a42c-9736-45b8-a2c9-c362bc221119 options:gateway_mtu "1330" i.e. Router port gateway_mtu option remains unchanged for a long time after value in neutron db has been changed. 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