@Wendy Mitchell，I set up a virtual env with 2+3(2-controller, 3-compute) system using 1120 iso image and OVS, and this bug also can't reproduce in this environment. Can you still reproduce this bug. If you can, can you elaborate on the steps to reproduce? The log is as following： controller-0:nova --os-username 'admin' --os-password 'Local.123' --os-project-name admin --os-auth-url http://keystone.openstack.svc.cluster.local/v3 --os-user-domain-name Default --os-project-domain-name Default --os-endpoint-type internalURL --os-region-name RegionOne boot --key-name=keypair-tenant1 --poll --flavor=1f2d052a-7891-4c99-934b-a362547d4198 --boot-volume=0ae7ea19-af67-476b-8552-93578fe7ca2f --nic net-id=56a66d9c-0fbf-4bd9-a6ec-429e28e3253d --nic net-id=dabcebd3-accb-418b-8f7b-9a656fa60fb0 --nic net-id=f2a1eed0-1823-4fe4-b0fb-99de85c21ed8 --meta foo=bar tenant1-config_drive-5 controller-0:~$ openstack --os-username 'admin' --os-password 'Local.123' --os-project-name admin --os-auth-url http://keystone.openstack.svc.cluster.local/v3 --os-user-domain-name Default --os-project-domain-name Default --os-identity-api-version 3 --os-interface internal --os-region-name RegionOne server show tenant1-config_drive-5 +-------------------------------------+----------------------------------------------------------------------------------------+ | Field | Value | +-------------------------------------+----------------------------------------------------------------------------------------+ | OS-DCF:diskConfig | MANUAL | | OS-EXT-AZ:availability_zone | nova | | OS-EXT-SRV-ATTR:host | compute-1 | | OS-EXT-SRV-ATTR:hypervisor_hostname | compute-1 | | OS-EXT-SRV-ATTR:instance_name | instance-00000006 | | OS-EXT-STS:power_state | Running | | OS-EXT-STS:task_state | None | | OS-EXT-STS:vm_state | active | | OS-SRV-USG:launched_at | 2019-11-21T05:44:03.000000 | | OS-SRV-USG:terminated_at | None | | accessIPv4 | | | accessIPv6 | | | addresses | external-net0=192.168.1.222; private-net0=192.168.201.214; public-net0=192.168.101.172 | | config_drive | | | created | 2019-11-21T05:43:37Z | | flavor | m1.tiny (1f2d052a-7891-4c99-934b-a362547d4198) | | hostId | 94c0ea38127cce24b1b55985bc2eb9d970e5f952a0bda324d2ddc376 | | id | 3525d655-cb02-4f52-8773-9032aa1e7a28 | | image | | | key_name | keypair-tenant1 | | name | tenant1-config_drive-5 | | progress | 0 | | project_id | 6dd8533fcf4543088285bc4568a97264 | | properties | foo='bar' | | security_groups | name='default' | | | name='default' | | | name='default' | | status | ACTIVE | | updated | 2019-11-24T02:16:06Z | | user_id | 15204dd643234fd695b58e6605ec0ac0 | | volumes_attached | id='0ae7ea19-af67-476b-8552-93578fe7ca2f' | +-------------------------------------+----------------------------------------------------------------------------------------+ Migrate the instance from compute-1 to compute-2 and restart the compute-0 at the same time. controller-0:~$ nova --os-username 'admin' --os-password 'Local.123' --os-project-name admin --os-auth-url http://keystone.openstack.svc.cluster.local/v3 --os-user-domain-name Default --os-project-domain-name Default --os-endpoint-type internalURL --os-region-name RegionOne live-migration 4f4c6c52-e989-49ae-bff1-949d4ae8f1be compute-2 controller-0:~$ openstack --os-username 'admin' --os-password 'Local.123' --os-project-name admin --os-auth-url http://keystone.openstack.svc.cluster.local/v3 --os-user-domain-name Default --os-project-domain-name Default --os-identity-api-version 3 --os-interface internal --os-region-name RegionOne server show tenant1-config_drive-5 +-------------------------------------+----------------------------------------------------------------------------------------+ | Field | Value | +-------------------------------------+----------------------------------------------------------------------------------------+ | OS-DCF:diskConfig | MANUAL | | OS-EXT-AZ:availability_zone | nova | | OS-EXT-SRV-ATTR:host | compute-2 | | OS-EXT-SRV-ATTR:hypervisor_hostname | compute-2 | | OS-EXT-SRV-ATTR:instance_name | instance-00000006 | | OS-EXT-STS:power_state | Running | | OS-EXT-STS:task_state | None | | OS-EXT-STS:vm_state | active | | OS-SRV-USG:launched_at | 2019-11-21T05:44:03.000000 | | OS-SRV-USG:terminated_at | None | | accessIPv4 | | | accessIPv6 | | | addresses | external-net0=192.168.1.222; private-net0=192.168.201.214; public-net0=192.168.101.172 | | config_drive | | | created | 2019-11-21T05:43:37Z | | flavor | m1.tiny (1f2d052a-7891-4c99-934b-a362547d4198) | | hostId | 258612b9a958d66815761ad7f0966dedde6d83aa7d5c756fe85ce20d | | id | 3525d655-cb02-4f52-8773-9032aa1e7a28 | | image | | | key_name | keypair-tenant1 | | name | tenant1-config_drive-5 | | progress | 0 | | project_id | 6dd8533fcf4543088285bc4568a97264 | | properties | foo='bar' | | security_groups | name='default' | | | name='default' | | | name='default' | | status | ACTIVE | | updated | 2019-11-25T07:40:22Z | | user_id | 15204dd643234fd695b58e6605ec0ac0 | | volumes_attached | id='0ae7ea19-af67-476b-8552-93578fe7ca2f' | +-------------------------------------+----------------------------------------------------------------------------------------+ cotroller-0:ssh compute-2 compute-2:~$ sudo ip netns exec qdhcp-56a66d9c-0fbf-4bd9-a6ec-429e28e3253d ping 192.168.101.172 PING 192.168.101.172 (192.168.101.172) 56(84) bytes of data. 64 bytes from 192.168.101.172: icmp_seq=1 ttl=64 time=13.8 ms 64 bytes from 192.168.101.172: icmp_seq=2 ttl=64 time=1.22 ms 64 bytes from 192.168.101.172: icmp_seq=3 ttl=64 time=0.876 ms 64 bytes from 192.168.101.172: icmp_seq=4 ttl=64 time=0.810 ms 64 bytes from 192.168.101.172: icmp_seq=5 ttl=64 time=0.978 ms 64 bytes from 192.168.101.172: icmp_seq=6 ttl=64 time=3.21 ms 64 bytes from 192.168.101.172: icmp_seq=7 ttl=64 time=0.834 ms 64 bytes from 192.168.101.172: icmp_seq=8 ttl=64 time=0.810 ms 64 bytes from 192.168.101.172: icmp_seq=9 ttl=64 time=0.853 ms 64 bytes from 192.168.101.172: icmp_seq=10 ttl=64 time=0.869 ms 64 bytes from 192.168.101.172: icmp_seq=11 ttl=64 time=0.817 ms ^C64 bytes from 192.168.101.172: icmp_seq=12 ttl=64 time=0.833 ms 64 bytes from 192.168.101.172: icmp_seq=13 ttl=64 time=0.860 ms ^C --- 192.168.101.172 ping statistics --- 13 packets transmitted, 13 received, 0% packet loss, time 12017ms rtt min/avg/max/mdev = 0.810/2.064/13.870/3.465 ms