neutron/releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml
Luis Tomas Bolivar 7dfbdf65a7 Add support for localnet_learn_fdb OVN option
In OVN 22.09, the option "localnet_learn_fdb" was added so that
localnet ports can learn MAC addresses and store them in the FDB
table. This avoids flooding issues for VMs on provider networks
when port security is disabled

Closes-Bug: #2012069
Change-Id: I93574b4fe9a79b649bfe755cf7e0697ccc7eb83a
2023-04-13 12:01:18 +02:00

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YAML

---
issues:
- |
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:
- |
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.