A network administrator is planning a flow table entry that provides fast failover for the traffic flow in case a link
fails. Which key element would the flow entry contain?

A.
a group identifier that specifies at least two output ports

B.
a backup set action that modifies the packet and sends it to the controller

C.
a forward action to the reserved port NEAREST_ACTIVE

D.
a go-to-table action that sends trafficto another table if the port is down

Explanation:
https://floodlight.atlassian.net/wiki/display/floodlightcontroller/How+to+Work+with+Fast-Failover+OpenFlow
+Groups