Comment 15 for bug 1894843

When using DVR-SNAT, a simple neutron-l3-agent gateway restart triggers this issue.

Reproduction Note: Nodes with an ACTIVE or BACKUP (in the case of L3HA) router for the network are not affected by this issue, so a small 1-6 node environment may make this difficult to reproduce or only affect half of the nodes (e.g. 3/6 nodes if you have L3HA).

Workaround: for each compute node, you need to create a new VM on each network. While registering the new VM port it will cause the missing fpr/rfp interface pair to be created and paired. It does not seem possible to fix it any other way such as stopping/starting the existing VM, rebooting the host, etc.