H3c-technologies H3C S5120 Series Switches User Manual download pdf (Page 11)

Figure 4 Components of a group entry

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 meter

table consists of meter entries.

Figure 5 Components of a meter entry

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 Components of a meter band

A meter band contains:

• Band Type—Defines how packets are processed. Packets that exceed the band rate are dropped.

• Rate—Used by the meter to select the meter band, 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

these VLANs.

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H3c-technologies H3C S5120 Series Switches User Manual Page 11