Reviewed: https://review.opendev.org/c/openstack/neutron/+/936723
Committed:
https://opendev.org/openstack/neutron/commit/2f8dd4919b5e6f9a7f5006bcc8f3445bfccc1ff1
Submitter: "Zuul (22348)"
Branch: master
commit 2f8dd4919b5e6f9a7f5006bcc8f3445bfccc1ff1
Author: Rodolfo Alonso Hernandez <ralon...@redhat.com>
Date: Fri Nov 29 11:17:46 2024 +0000
[OVN] Update the LRP gateway_mtu when the external network changes
During a external network MTU update, the OVN Logical_Switch cannot be
updated yet. Instead of reading the value from the OVN datatabase,
the LRP.options.gateway_mtu update uses the Neutron database object
once updated, that contains the new MTU provided in the API call.
Closes-Bug: #2060828
Change-Id: Iaeced67cc8bc8f90136e7f264c85f4983a07264a
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2060828
Title:
[OVN] Changing public network MTU does not update router port
gateway_mtu option
Status in neutron:
Fix Released
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.
Found on master devstack deployed on ubuntu-jammy.
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