Reviewed: https://review.opendev.org/c/openstack/neutron/+/797418
Committed:
https://opendev.org/openstack/neutron/commit/953eb92a4f1d686a45d91100c8b02f9fe0771ed9
Submitter: "Zuul (22348)"
Branch: master
commit 953eb92a4f1d686a45d91100c8b02f9fe0771ed9
Author: Lucas Alvares Gomes <lucasago...@gmail.com>
Date: Tue Jun 22 10:54:13 2021 +0100
[OVN] Disable mcast_flood on localnet ports
The mcast_flood option will unconditionally forward multicast traffic
for that port, this behavior is not desired and results in duplicated
traffic being sent to the same port. This patch disables that behavior
by setting the mcast_flood option for the localnet ports to False.
Note that, a similar option called "mcast_flood_reports" is still
enabled because we do want to have the multicast reports being sent but
not normal traffic.
Change-Id: I8033e12f5b30e3ecc9143431543266a890fe4073
Closes-Bug: #1933207
Signed-off-by: Lucas Alvares Gomes <lucasago...@gmail.com>
** Changed in: neutron
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1933207
Title:
[OVN] Duplicated multicast packets on external network
Status in neutron:
Fix Released
Bug description:
Reported at: https://bugzilla.redhat.com/show_bug.cgi?id=1949460
VMs subscribed to a multicast group are receiving 2 multicast packets
when only one is sent by a sender VM.
I dug into the problem and found out that the problematic option is
"mcast_flood" set in the localnet port types (provider network port)
by ML2/OVN. Setting it to "false" fix the duplication problem.
The QE team upstream ran our downstream tests against an environment
with that option disabled and everything worked fine. I think we
should fix it upstream as well.
Note, the problematic option is the "mcast_flood". A similar option
called "mcast_flood_reports" should still be enabled.
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