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[Bug 1943266] Re: Duplicated ARP responses from ovnmetadata namespaces

 

** Description changed:

- 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.
+ 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.
+ 
+ Reproducer: https://paste.ubuntu.com/p/nbnhvTM9d4/

** Description changed:

  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/

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1943266

Title:
  Duplicated ARP responses from ovnmetadata namespaces

Status in networking-ovn:
  New
Status in neutron:
  New

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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