An HP ProVision switch has an OpenFlow instance, which includes VLAN 20 and connects to a single HP VAN SDN Controller. The switch does not use spanning tree; instead it relies on SDN applications to create loop-free paths. A network administrator has changed the switch connection-interruption mode to fail-standalone.What happens if the switch loses its connection with this controller?

  • It continues to block VLAN 20 on ports, as directed by the OpenFlow controller, to eliminate loops. Otherwise, it forwards VLAN 20 traffic using normal switching and routing
  • It continues to use OpenFlow table entries until they expire, and it drops any VLAN 20 traffic that does not match a current entry
  • It forwards traffic in VLAN 20 using its normal switching and routing functions, and a loop could occur
  • It prevents all OpenFlow table entries from expiring and continues to forward VLAN 20 traffic using these entries
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