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Diffstat (limited to 'releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml')
| -rw-r--r-- | releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml b/releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml new file mode 100644 index 0000000000..9af9ca48be --- /dev/null +++ b/releasenotes/notes/localnet-learn-fdb-22469280b49701fc.yaml @@ -0,0 +1,23 @@ +--- +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. |