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issues:
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In OVN 22.09 the option "localnet_learn_fdb" was added, enabling localnet
ports to learn MAC addresses and store them at the FDB table.
There is no aging mechanism for those MACs (that is the reason for not
having this option enabled by default) and therefore it needs to be used
with care, specially when provider networks are big. It is recommended to
perform periodic manual cleanups of FDB table, to avoid scalability
issues -- until OVN implements an aging mechanism for this, tracked at
https://bugzilla.redhat.com/show_bug.cgi?id=2179942.
fixes:
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By default localnet ports don't learn MAC addresses and therefore they are
not stored in the FDB table at OVN SB DB. This leads to flooding issues
when the destination traffic is an unknown IP by OpenStack. In OVN 22.09
the option "localnet_learn_fdb" was added, enabling those ports to learn
MAC addresses and store them at the FDB table. Note there is no aging
mechanism for those MACs, thus this is not enabled by default and needs
to be used carefully, specially when provider networks are big, and/or
performing manual cleanup of FDB table over time to avoid scalability
issues, until OVN implements it at
https://bugzilla.redhat.com/show_bug.cgi?id=2179942.
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