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If one configures multiple VXLAN tunnels on the same port, with different flags (like GBP), OVS won't be able to handle that. It should refuse such configurations.

See RFC/patch and discussion upstream.

https://mail.openvswitch.org/pipermail/ovs-dev/2016-June/315570.html

I have submitted a new patch, but I think this patch was not needed to begin with. I've asked upstream to also comment on this. Patch is here:

https://mail.openvswitch.org/pipermail/ovs-dev/2017-June/333750.html

Need to do some more testing to see what Linux support in the datapath and re-send (or ack) patch.

Submitted v2 patch after confirming current implementation does not support concomitant tunnels.

https://mail.openvswitch.org/pipermail/ovs-dev/2018-February/344326.html

Sent out a v3 patch:

https://mail.openvswitch.org/pipermail/ovs-dev/2018-June/347807.html

Sent out a v4 of the patch:

https://mail.openvswitch.org/pipermail/ovs-dev/2018-September/351805.html

Committed:
https://github.com/openvswitch/ovs/commit/189de33f02b27663f15e5034c6eefb3bcaaca8fc