I use the Openstack Ocata and have the internet connection loss problem in the instance. I found the log of neutron-openvswitch-agent.log as below when the internet connection loss in the instance, port ID: fdc885fb-fa01-401f-ab4b-c366cf846681.
2021-07-15 08:35:52.394 118987 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-1086b503-3aa3-4f25-84f8-07f0ee992fed - - - - -] Port fdc885fb-fa01-401f-ab4b-c366cf846681 updated. Details: {u'profile': {}, u'network_qos_policy_id': None, u'qos_policy_id': None, u'allowed_address_pairs': [], u'admin_state_up': True, u'network_id': u'f741e730-0521-47fa-9845-8314bca936d8', u'segmentation_id': 10344, u'mtu': 1500, u'device_owner': u'compute:th-central-a', u'physical_network': None, u'mac_address': u'fa:16:3e:09:7e:7b', u'device': u'fdc885fb-fa01-401f-ab4b-c366cf846681', u'port_security_enabled': True, u'port_id': u'fdc885fb-fa01-401f-ab4b-c366cf846681', u'fixed_ips': [{u'subnet_id': u'80fc6688-ea12-4173-a8a4-ecc614c488f0', u'ip_address': u'10.148.0.17'}], u'network_type': u'vxlan'}
2021-07-15 08:37:32.234 118987 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-1086b503-3aa3-4f25-84f8-07f0ee992fed - - - - -] Port fdc885fb-fa01-401f-ab4b-c366cf846681 updated. Details: {u'profile': {}, u'network_qos_policy_id': None, u'qos_policy_id': None, u'allowed_address_pairs': [], u'admin_state_up': True, u'network_id': u'f741e730-0521-47fa-9845-8314bca936d8', u'segmentation_id': 10344, u'mtu': 1500, u'device_owner': u'compute:th-central-a', u'physical_network': None, u'mac_address': u'fa:16:3e:09:7e:7b', u'device': u'fdc885fb-fa01-401f-ab4b-c366cf846681', u'port_security_enabled': True, u'port_id': u'fdc885fb-fa01-401f-ab4b-c366cf846681', u'fixed_ips': [{u'subnet_id': u'80fc6688-ea12-4173-a8a4-ecc614c488f0', u'ip_address': u'10.148.0.17'}], u'network_type': u'vxlan'}
2021-07-15 08:38:12.658 118987 INFO neutron.agent.securitygroups_rpc [req-1086b503-3aa3-4f25-84f8-07f0ee992fed - - - - -] Preparing filters for devices set([u'c8e299da-073d-418b-b42c-9da7af07893c', u'3ad72807-6071-4e03-9f43-344d663d0e81', u'1a6358e5-7d2b-49d3-bba7-18319a75a9eb', u'bc5a3528-bec4-496c-9901-f32c56548c48', u'274ba22c-0633-476b-9ae2-f0452663e259', u'be4f2c5c-414c-4fb5-bd7e-4c1655bcbe40', u'a4e95210-932d-4020-a8b1-3e6072c51d0a', u'dc697809-ef22-43ba-8a44-a5980dc80d95', u'd4ce7e47-9bd3-4b43-ae8f-a8db5aaac71c', u'61a3e882-7ede-4db8-8f5b-62eb61da224a', u'c61663eb-e513-4379-80c9-9b6cb563c76e', u'd1f28e6d-4dfc-4dcf-9ca1-22344d3c8562', u'5e6d4fbe-f3eb-42a1-8ea7-50e56531ce25', u'd08dc2ac-e14e-4d70-987d-3fcea3de4921', u'c34635ac-eb35-4097-9dc3-d057d0c4644f', u'77f657ae-9a28-4f12-92cf-385ea5f3faf5', u'32290e6d-5abc-4405-8884-1aa0c35777a9', u'350f4b4d-1eef-4f8c-8c7c-34a086ec1436', u'03b6fb96-b414-4061-a588-8d2cdf29edd9', u'861798a8-ab1d-4c36-b99e-c8727439d128', 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u'abcf46f9-051d-4208-8139-30cb8f7cca30'])
2021-07-15 08:38:16.071 118987 INFO neutron.agent.linux.openvswitch_firewall.firewall [req-1086b503-3aa3-4f25-84f8-07f0ee992fed - - - - -] Initializing port fdc885fb-fa01-401f-ab4b-c366cf846681 that was already initialized.
2021-07-15 08:42:26.920 118987 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-1086b503-3aa3-4f25-84f8-07f0ee992fed - - - - -] Configuration for devices up [u'c8e299da-073d-418b-b42c-9da7af07893c', u'3ad72807-6071-4e03-9f43-344d663d0e81', u'1a6358e5-7d2b-49d3-bba7-18319a75a9eb', u'bc5a3528-bec4-496c-9901-f32c56548c48', u'274ba22c-0633-476b-9ae2-f0452663e259', u'be4f2c5c-414c-4fb5-bd7e-4c1655bcbe40', u'a4e95210-932d-4020-a8b1-3e6072c51d0a', u'dc697809-ef22-43ba-8a44-a5980dc80d95', u'd4ce7e47-9bd3-4b43-ae8f-a8db5aaac71c', u'61a3e882-7ede-4db8-8f5b-62eb61da224a', u'e8ea4b79-df5a-4354-9792-3f98f85d9491', u'7e94457e-20ac-4c93-a170-d5a9a597a125', u'5e6d4fbe-f3eb-42a1-8ea7-50e56531ce25', u'd08dc2ac-e14e-4d70-987d-3fcea3de4921', u'c34635ac-eb35-4097-9dc3-d057d0c4644f', u'77f657ae-9a28-4f12-92cf-385ea5f3faf5', u'32290e6d-5abc-4405-8884-1aa0c35777a9', u'350f4b4d-1eef-4f8c-8c7c-34a086ec1436', u'03b6fb96-b414-4061-a588-8d2cdf29edd9', 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u'bf8ca75e-d181-4669-af5f-89ab327f5373', u'abcf46f9-051d-4208-8139-30cb8f7cca30'] and devices down [] completed.
How can I solve this problem? It seems the internet connection loss in the instance occured while openvswitch updated the port status.
Environment :
Openstack Ocata,
Nova 15.1.28,
Openvswitch 2.6.3
