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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 traffic to another table if the port is down
Correct Answer: A
Explanation/Reference:
Explanation:
The FAST-FAILOVER group is designed specifically to detect and overcome port failures.
The FAST-FAILOVER (FF) group. A FF group is designed to detect and respond to port failures. Each bucket has a watch port/group as a special parameter, which monitors the liveness of that port or group being watched. Only one bucket is used at a time, and the bucket will only be changed if the watch port/ group of the bucket transitions from up to down. Upon such an event, another bucket will be chosen whose watch port/group indicates the link is up.
References:
https://floodlight.atlassian.net/wiki/display/floodlightcontroller/How+to+Work+with+Fast-Failover+OpenFlow+G roups
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