Why instances are not reachable for few mins after live-migration?

Solution In Progress - Updated -

Issue

  • Why instances are not reachable for few mins after live-migration?
Reproducible steps:
  • Before live-migration instance was pingable.
  • Traffic lost during the migration.
  • Once the instance is spawned successfully on destination compute node still it not reachable for 5 mins. Which is equal to 300s default timeout for linux bridge entry.
  • Traffic was reaching upto the qvb interface of linux bridge but was not reaching to tap interface.
  • Security rules doesn't seem to be an issue here.
  • Captured linux bridge mac entries at the time of issue from destination compute node indicates that wrong port and MAC address mapping could be the cause of issue.
  • Newly populated after timeout of old entry entry pick the right port corresponding to MAC address.
  • After that instance was reachable.

Note: Issue was not reproducible at desire, it's an intermittent issue.

Environment

  • Red Hat OpenStack Platform 8.0
  • Cisco ACI

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