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  1. Fast Datapath Product
  2. FDP-1369

CLONE [ovn24.03 fast-datapath-rhel-9] - Flapping OCP virtual ports

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    • ovn24.03
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      Given the system administrator has multiple OCP clusters deployed on top of OSP and these clusters are undergoing a failover scenario or experiencing high GARP traffic, 

      When ovn-northd receives high-frequency gARPs from multiple sources during a failover or similar event, 

      Then, ovn-northd should be able to process this traffic without overloading, maintaining stable CPU usage and avoiding cluster-wide failover effects.

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      Given the system administrator has multiple OCP clusters deployed on top of OSP and these clusters are undergoing a failover scenario or experiencing high GARP traffic,  When ovn-northd receives high-frequency gARPs from multiple sources during a failover or similar event,  Then, ovn-northd should be able to process this traffic without overloading, maintaining stable CPU usage and avoiding cluster-wide failover effects.
    • ovn24.03-24.03.5-71.el9fdp
    • rhel-9
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    • rhel-net-ovn
    • ssg_networking
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      We had a customer case where lots of OCP clusters are deployed on top of OpenStack. An OSP upgrade attempt triggered OCP VIP failover that loaded ovn-northd so much that other OCP clusters started their failovers too causing a snowball effect.

      The dataplane has never recovered fully and OCPs kept sending gratuitous ARPs periodically from all their nodes, causing lot of virtual parent ports updates in the southbound DB.

      This ticket serves as a discussion starter how to make OVN more resilient to gARPs coming from multiple sources at the same time.

              amusil@redhat.com Ales Musil
              ovnteam@redhat.com OVN Team
              Aniss Loughlam Aniss Loughlam
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