L2GW tunnel(s) not created when auto tunnel mode is enabled

When auto tunnel mode is enabled (default for netvirt, currently), there are some issues when L2GW and L2GW connection are configured. Usually, what I see is there will not be a tunnel between the TOR and the remote TEP (dump vtep db).

If I delete the automatically created Transport Zones in ITM via restconf, and then create the L2GW and L2GW connection, the tunnel between the TOR and remote TEP will be created.

This issue has also been observed and repored by Tomer Pearl in the OVSDB mailing list.

One workaround that has been mentioned (I have not tried it yet) is to disable auto tunnel creation in netvirt config file.