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Thank you for your information.
I would like to ask you to provide few more data:
- could you collect packet capture from instance, please?
- could you check bridge type of br-int, please?
- what is the connection between tapxxx and qr-xxx?
As per my understanding: tap and qr ports might be linked. From compute host perspective it might happen that packets will be visible on both interfaces.
Flooding might happen if br-int is a regular bridge (not switch). What is more, if information about IP-MAC is not known, ARP will be sent to get information which MAC has IP address or flood will be done one time to get reply which MAC has IP.