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  1. Red Hat OpenStack Services on OpenShift
  2. OSPRH-12699

Add a description for ovn_emit_need_to_frag = true and notes about MTU configuration in external and internal networks for RHOSP 17.1

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      Before this fix, OpenStack did not fragment north-south packets as expected when the external maximum transmission unit (MTU) was less than the internal MTU. This resulted in packets being dropped silently.
      With this update, fragmentation happens as expected, and packets are not dropped silently.
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      Before this fix, OpenStack did not fragment north-south packets as expected when the external maximum transmission unit (MTU) was less than the internal MTU. This resulted in packets being dropped silently. With this update, fragmentation happens as expected, and packets are not dropped silently.
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      Currently, OSP17.1 and RHOSO18 cannot handle packet fragmentation in the case of external MTU > internal MTU case,
      To prevent the situation, we need to notify our uses to configure

      1. Set ovn_emit_need_to_frag parameter in neutron 
        [ovn] ovn_emit_need_to_frag = true
      2. external MTU < internal MTU
      3. Recreate a router to make it effective.

      This issue will affect to all users

              jamsmith@redhat.com James Smith
              rhn-support-knoha Keigo Noha
              rhos-dfg-networking-squad-neutron
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