Comment 2 for bug 2023027

After Xena Upgrade it is self resolving. No more l3 agent restart is required.

The resolve times:

30 seconds for a compute which has 3 instances (kernel: 5.4.0-150-generic)
2 seconds for a compute which has 6 instances. (kernel: 5.4.0-90-generic)

ovs-vswitchd logs are attached.

Environment Details:
 Openstack Version: Xena (cluster installed via kolla-ansible)
 OS Version: Ubuntu 20.04.2 LTS Hosts. (Controller+Network Node Kernel:5.4.0-90-generic | Compute Nodes: Mixed 5.4.0-90-generic and 5.4.0-150-generic)
 Neutron Version: 19.4.1.dev106 ["neutron-server", "neutron-dhcp-agent", "neutron-openvswitch-agent", "neutron-l3-agent", "neutron-bgp-dragent", "neutron-metadata-agent"]
 There exist 5 controller+network node.
 OpenvSwitch used in DVR mode and router HA is disabled. (l3_ha = false)
 We are using a single centralized neutron router for connecting all tenant networks to provider network.
 We are using bgp_dragent to announce unique tenant networks.
 Tenant network type: vxlan
 External network type: vlan