[Bug 1943266] Re: Duplicated ARP responses from ovnmetadata namespaces
Frode Nordahl
1943266 at bugs.launchpad.net
Fri Oct 1 07:52:58 UTC 2021
Erlon: For completeness I'm adding the second patch you found we need to
resolve this issue: https://github.com/ovn-
org/ovn/commit/96959e56d634c8d888af9e3ee340602593c7e4fa
** Changed in: ovn (Ubuntu)
Status: New => Triaged
** Changed in: ovn (Ubuntu)
Importance: Undecided => High
** Changed in: networking-ovn
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1943266
Title:
Duplicated ARP responses from ovnmetadata namespaces
Status in networking-ovn:
Invalid
Status in ovn package in Ubuntu:
Triaged
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 at 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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