H3C Technologies H3C S6800 Series Switches - Manual (Page 13)

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of the flow tables contains an action list, the OpenFlow switch executes the actions to modify a copy of
the packet immediately in this table.
Figure 3 OpenFlow forwarding workflow
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.
Meter table
Meters enable OpenFlow to implement various simple QoS operations, such as rate-limiting. A group
table contains meter entries.
Figure 5 Meter entry components
A meter entry contains the following fields:
• Meter Identifier—A 32 bit unsigned integer uniquely identifying the meter.
• Meter Bands—Each meter can have one or more meter bands. Each band specifies the rate at
which the band applies and the way packets should be processed. If the current rate of packets
exceeds the rate of multiple bands, the band with the highest configured rate is used.
• Counters—Updated when packets are processed by a meter.