H3C Technologies H3C S12500-X Series Switches - Manual (Page 10)

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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.
• 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.
Figure 6 Band components
A meter band contains the following fields:
• Band Type—Packet processing methods. Packets that exceed the band rate are dropped.
• Rate—Defines the lowest rate at which the band can apply.
• Counters—Updated when packets are processed by a band.
• Type Specific Arguments—Some band types have optional arguments.
OpenFlow instance
You can configure one or more OpenFlow instances on the same device. A controller considers each
OpenFlow instance as a separate OpenFlow switch and deploys forwarding instructions to it.
In this chapter, an OpenFlow switch is the same as an OpenFlow instance, unless otherwise specified.
Associated VLAN
When an OpenFlow instance is associated with VLANs, the flow tables take effect on packets only within
those VLANs.