FYI, this bug was fixed in the upstream branch v21.06.0 this is the
patch:
https://github.com/ovn-
org/ovn/commit/578238b36073256c524a4c2b6ed7521f73aa0019
** Changed in: networking-ovn
Status: New => Confirmed
** Changed in: networking-ovn
Assignee: (unassigned) => Erlon R. Cruz (sombrafam)
** No longer affects: neutron
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https://bugs.launchpad.net/bugs/1943266
Title:
Duplicated ARP responses from ovnmetadata namespaces
Status in networking-ovn:
Confirmed
Bug description:
When OpenStack instances are connected to an external network, an
ovn-etadata-namespace is created in each compute that has VMs attached to that
network. Because the ovn-metadata namespace has interfaces with the same mac
address in all computers, external switches might ARP query for the IP
and receive multiple responses in different ports triggering network error
alerts.
[ubuntu@sombrafam-bastion(kvm):~/internal_git/stsstack-bundles/openstack]$
sudo arping -c 1 10.5.150.0
ARPING 10.5.150.0
42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=0 time=1.678 msec
42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=1 time=2.143 msec
--- 10.5.150.0 statistics ---
1 packets transmitted, 2 packets received, 0% unanswered (1 extra)
rtt min/avg/max/std-dev = 1.678/1.911/2.143/0.232 ms
Reproducer: https://paste.ubuntu.com/p/nbnhvTM9d4/
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