Group table
The ability for a flow entry to point to a group enables OpenFlow to represent additional methods of forwarding. A group table contains group entries.
Figure 4: Group entry components
A group entry contains the following fields:
Group Identifier—A 32 bit unsigned integer uniquely identifying the group.
Group Type—Type of the group:
All—Execute all buckets in the group. This group is used for multicast or broadcast forwarding.
Counters—Updated when packets are processed by a group.
Action Buckets—An ordered list of action buckets, where each action bucket contains a set of actions to execute and associated parameters.