neutron/releasenotes/notes/dvr-external-mac-934409413e515eb2.yaml
Luis Tomas Bolivar 0090572b93 Ensure traffic is not centralized if DVR is enabled
There is no need to clear the external_mac if DVR is enabled, not
even when the port is down. This patch ensures the external_mac is
only deleted when DVR is not enabled.

Without this patch, if a VM with a floating IP gets deleted, and
DVR is enabled, during some time the traffic gets (wrongly)
centralized while it should not. And it is also generating more
load on the OVN side unnecesarily.

Closes-Bug: #2025264

Change-Id: I89db15dd1b629bc963f3b63926391a4a02cbedf7
2023-06-28 17:05:26 +02:00

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YAML

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The external_mac entry in the NAT table is used to distribute/centralize
the traffic to the FIPs. When there is an external_mac set the traffic
is distributed (DVR). When it is empty it is centralized through the
gateway port (no DVR). Upon port status transition to down, the
external_mac was removed regardless of DVR being enabled or not, leading
to centralize the FIP traffic for DVR -- though it was for down ports that
won't accept traffic anyway.